improved conversion system logging, collection converter simplification/polish, several optimizations, annotation-driven formatting caching

org.springframework.context/src/main/java/org/springframework/format/support/FormattingConversionService.java

@@ -17,12 +17,14 @@
 package org.springframework.format.support;
 
 import java.lang.annotation.Annotation;
+import java.text.ParseException;
 import java.util.Collections;
+import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
 import org.springframework.context.i18n.LocaleContextHolder;
 import org.springframework.core.GenericTypeResolver;
-import org.springframework.core.convert.ConversionFailedException;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
@@ -66,6 +68,9 @@ public class FormattingConversionService extends GenericConversionService implem
 		}		
 		Set<Class<?>> fieldTypes = annotationFormatterFactory.getFieldTypes();
 
+		final Map<FieldFormatterKey, GenericConverter> cachedPrinters = new ConcurrentHashMap<FieldFormatterKey, GenericConverter>();
+		final Map<FieldFormatterKey, GenericConverter> cachedParsers = new ConcurrentHashMap<FieldFormatterKey, GenericConverter>();
+		
 		for (final Class<?> fieldType : fieldTypes) {
 			addConverter(new ConditionalGenericConverter() {
 				public Set<ConvertiblePair> getConvertibleTypes() {
@@ -75,8 +80,14 @@ public class FormattingConversionService extends GenericConversionService implem
 					return (sourceType.getAnnotation(annotationType) != null);
 				}
 				public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
-					Printer<?> printer = annotationFormatterFactory.getPrinter(sourceType.getAnnotation(annotationType), sourceType.getType());
-					return new PrinterConverter(fieldType, printer, FormattingConversionService.this).convert(source, sourceType, targetType);
+					FieldFormatterKey key = new FieldFormatterKey(sourceType.getAnnotation(annotationType), fieldType);
+					GenericConverter converter = cachedPrinters.get(key);
+					if (converter == null) {
+						Printer<?> printer = annotationFormatterFactory.getPrinter(key.getAnnotation(), key.getFieldType());
+						converter = new PrinterConverter(fieldType, printer, FormattingConversionService.this);
+						cachedPrinters.put(key, converter);
+					}
+					return converter.convert(source, sourceType, targetType);
 				}
 				public String toString() {
 					return "@" + annotationType.getName() + " " + fieldType.getName() + " -> " +
@@ -91,8 +102,14 @@ public class FormattingConversionService extends GenericConversionService implem
 					return (targetType.getAnnotation(annotationType) != null);
 				}
 				public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
-					Parser<?> parser = annotationFormatterFactory.getParser(targetType.getAnnotation(annotationType), targetType.getType());
-					return new ParserConverter(fieldType, parser, FormattingConversionService.this).convert(source, sourceType, targetType);
+					FieldFormatterKey key = new FieldFormatterKey(targetType.getAnnotation(annotationType), fieldType);
+					GenericConverter converter = cachedParsers.get(key);
+					if (converter == null) {
+						Parser<?> printer = annotationFormatterFactory.getParser(key.getAnnotation(), key.getFieldType());
+						converter = new ParserConverter(fieldType, printer, FormattingConversionService.this);
+						cachedParsers.put(key, converter);
+					}
+					return converter.convert(source, sourceType, targetType);
 				}
 				public String toString() {
 					return String.class.getName() + " -> @" + annotationType.getName() + " " +
@@ -102,6 +119,38 @@ public class FormattingConversionService extends GenericConversionService implem
 		}
 	}
 
+	private static final class FieldFormatterKey {
+		
+		private final Annotation annotation;
+		
+		private final Class<?> fieldType;
+		
+		public FieldFormatterKey(Annotation annotation, Class<?> fieldType) {
+			this.annotation = annotation;
+			this.fieldType = fieldType;
+		}
+		
+		public Annotation getAnnotation() {
+			return annotation;
+		}
+		
+		public Class<?> getFieldType() {
+			return fieldType;
+		}
+		
+		public boolean equals(Object o) {
+			if (!(o instanceof FieldFormatterKey)) {
+				return false;
+			}
+			FieldFormatterKey key = (FieldFormatterKey) o;
+			return this.annotation.equals(key.annotation) && this.fieldType.equals(key.fieldType);
+		}
+		
+		public int hashCode() {
+			return this.annotation.hashCode() + this.fieldType.hashCode();
+		}
+		
+	}
 
 	private static class PrinterConverter implements GenericConverter {
 
@@ -142,7 +191,6 @@ public class FormattingConversionService extends GenericConversionService implem
 		}
 	}
 
-
 	private static class ParserConverter implements GenericConverter {
 
 		private Class<?> fieldType;
@@ -166,17 +214,17 @@ public class FormattingConversionService extends GenericConversionService implem
 			if (text == null || text.length() == 0) {
 				return null;
 			}
+			Object result;
 			try {
-				Object result = this.parser.parse(text, LocaleContextHolder.getLocale());
-				TypeDescriptor resultType = TypeDescriptor.valueOf(result.getClass());
-				if (!resultType.isAssignableTo(targetType)) {
-					result = this.conversionService.convert(result, resultType, targetType);
-				}
-				return result;
+				result = this.parser.parse(text, LocaleContextHolder.getLocale());
+			} catch (ParseException e) {
+				throw new IllegalArgumentException("Unable to parse '" + text + "'", e);
 			}
-			catch (Exception ex) {
-				throw new ConversionFailedException(sourceType, targetType, source, ex);
+			TypeDescriptor resultType = TypeDescriptor.valueOf(result.getClass());
+			if (!resultType.isAssignableTo(targetType)) {
+				result = this.conversionService.convert(result, resultType, targetType);
 			}
+			return result;
 		}
 
 		public String toString() {

org.springframework.core/src/main/java/org/springframework/core/convert/TypeDescriptor.java

@@ -231,7 +231,7 @@ public class TypeDescriptor {
 	 * Is this type a {@link Collection} type?
 	 */
 	public boolean isCollection() {
-		return isTypeAssignableTo(Collection.class);
+		return Collection.class.isAssignableFrom(getType());
 	}
 
 	/**
@@ -257,6 +257,15 @@ public class TypeDescriptor {
 		return TypeDescriptor.valueOf(getElementType());
 	}
 
+	/**
+	 * Return the element type as a type descriptor; if the element type is null (cannot be determined), the type descriptor is derived from the element argument.
+	 * @param element the element
+	 * @return the element type descriptor
+	 */
+	public TypeDescriptor getElementTypeDescriptor(Object element) {
+		return getElementType() != null ? getElementTypeDescriptor() : TypeDescriptor.forObject(element);
+	}
+
 	/**
 	 * Create a copy of this type descriptor, preserving the context information
 	 * but exposing the specified element type (e.g. an array/collection element).
@@ -280,7 +289,7 @@ public class TypeDescriptor {
 	 * Is this type a {@link Map} type?
 	 */
 	public boolean isMap() {
-		return isTypeAssignableTo(Map.class);
+		return Map.class.isAssignableFrom(getType());
 	}
 
 	/**
@@ -355,6 +364,15 @@ public class TypeDescriptor {
 		return TypeDescriptor.valueOf(getMapKeyType());
 	}
 
+	/**
+	 * Return the map key type as a type descriptor; if the key type is null (cannot be determined), the type descriptor is derived from the key argument.
+	 * @param key the key
+	 * @return the map key type descriptor
+	 */
+	public TypeDescriptor getMapKeyTypeDescriptor(Object key) {
+		return getMapKeyType() != null ? getMapKeyTypeDescriptor() : TypeDescriptor.forObject(key);
+	}
+	
 	/**
 	 * Returns map value type as a type descriptor.
 	 */
@@ -362,6 +380,15 @@ public class TypeDescriptor {
 		return TypeDescriptor.valueOf(getMapValueType());
 	}
 
+	/**
+	 * Return the map value type as a type descriptor; if the value type is null (cannot be determined), the type descriptor is derived from the value argument.
+	 * @param value the value
+	 * @return the map value type descriptor
+	 */
+	public TypeDescriptor getMapValueTypeDescriptor(Object value) {
+		return getMapValueType() != null ? getMapValueTypeDescriptor() : TypeDescriptor.forObject(value);
+	}
+
 	/**
 	 * Obtain the annotations associated with the wrapped parameter/field, if any.
 	 */
@@ -374,8 +401,6 @@ public class TypeDescriptor {
 		}
 		else if (this.methodParameter != null) {
 			if (this.methodParameter.getParameterIndex() < 0) {
-				// The best we can do for return type metadata is to expose
-				// method-level annotations when the target is the return type...
 				return this.methodParameter.getMethodAnnotations();
 			}
 			else {
@@ -400,76 +425,22 @@ public class TypeDescriptor {
 	}
 
 	/**
-	 * Returns true if an object this type can be assigned to a reference of given targetType.
+	 * Returns true if an object of this type can be assigned to a reference of given targetType.
 	 * @param targetType the target type
 	 * @return true if this type is assignable to the target
 	 */
 	public boolean isAssignableTo(TypeDescriptor targetType) {
-		Class targetClass = targetType.getType();
-		if (!isTypeAssignableTo(targetClass)) {
-			return false;
-		}
-		if (targetClass != null) {
-			if (Collection.class.isAssignableFrom(targetClass)) {
-				Class<?> elementType = targetType.getCollectionElementType();
-				if (elementType != null) {
-					Class<?> sourceElementType = getCollectionElementType();
-					if (sourceElementType == null || !elementType.isAssignableFrom(sourceElementType)) {
-						return false;
-					}
-				}
-			}
-			else if (Map.class.isAssignableFrom(targetClass)) {
-				Class<?> keyType = targetType.getMapKeyType();
-				if (keyType != null) {
-					Class<?> sourceKeyType = getMapKeyType();
-					if (sourceKeyType == null || !keyType.isAssignableFrom(sourceKeyType)) {
-						return false;
-					}
-				}
-				Class<?> valueType = targetType.getMapValueType();
-				if (valueType != null) {
-					Class<?> sourceValueType = getMapValueType();
-					if (sourceValueType == null || !valueType.isAssignableFrom(sourceValueType)) {
-						return false;
-					}
-				}
-			}
+		if (this == TypeDescriptor.NULL || targetType == TypeDescriptor.NULL) {
+			return true;
 		}
-		return true;
+		return targetType.getObjectType().isAssignableFrom(getObjectType());
 	}
 
 	/**
 	 * A textual representation of the type descriptor (eg. Map<String,Foo>) for use in messages
 	 */
 	public String asString() {
-		StringBuffer stringValue = new StringBuffer();
-		if (isArray()) {
-			// TODO should properly handle multi dimensional arrays
-			stringValue.append(getArrayComponentType().getName()).append("[]");
-		}
-		else {
-			Class<?> clazz = getType();
-			if (clazz == null) {
-				return "null";
-			}
-			stringValue.append(clazz.getName());
-			if (isCollection()) {
-				Class<?> collectionType = getCollectionElementType();
-				if (collectionType != null) {
-					stringValue.append("<").append(collectionType.getName()).append(">");
-				}
-			}
-			else if (isMap()) {
-				Class<?> keyType = getMapKeyType();
-				Class<?> valType = getMapValueType();
-				if (keyType != null && valType != null) {
-					stringValue.append("<").append(keyType.getName()).append(",");
-					stringValue.append(valType).append(">");
-				}
-			}
-		}
-		return stringValue.toString();
+		return toString();
 	}
 
 	public String toString() {
@@ -484,6 +455,14 @@ public class TypeDescriptor {
 				builder.append("@").append(ann.annotationType().getName()).append(' ');
 			}
 			builder.append(ClassUtils.getQualifiedName(getType()));
+			if (isMap()) {
+				Class<?> mapKeyType = getMapKeyType();
+				Class<?> valueKeyType = getMapValueType();
+				builder.append("<").append(mapKeyType != null ? ClassUtils.getQualifiedName(mapKeyType) : "?").append(", ").append(valueKeyType != null ? ClassUtils.getQualifiedName(valueKeyType) : "?").append(">");
+			} else if (isCollection()) {
+				Class<?> elementType = getElementType();
+				builder.append("<").append(elementType != null ? ClassUtils.getQualifiedName(elementType) : "?").append(">");				
+			}
 			builder.append("]");
 			return builder.toString();
 		}
@@ -521,12 +500,6 @@ public class TypeDescriptor {
 		}
 	}
 
-	private boolean isTypeAssignableTo(Class<?> clazz) {
-		Class<?> type = getType();
-		return (type != null && (clazz == null || ClassUtils.isAssignable(clazz, type)));
-	}
-
-
 	// static factory methods
 
 	/**
@@ -551,7 +524,7 @@ public class TypeDescriptor {
 		if (object == null) {
 			return NULL;
 		}
-		else if (object instanceof Collection || object instanceof Map) {
+		else if (object instanceof Collection<?> || object instanceof Map<?, ?>) {
 			return new TypeDescriptor(object);
 		}
 		else {

org.springframework.core/src/main/java/org/springframework/core/convert/support/ArrayToArrayConverter.java

@@ -20,6 +20,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.Set;
 
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.GenericConverter;
 import org.springframework.util.ObjectUtils;
@@ -35,7 +36,7 @@ final class ArrayToArrayConverter implements GenericConverter {
 
 	private final CollectionToArrayConverter helperConverter;
 
-	public ArrayToArrayConverter(GenericConversionService conversionService) {
+	public ArrayToArrayConverter(ConversionService conversionService) {
 		this.helperConverter = new CollectionToArrayConverter(conversionService);
 	}
 

org.springframework.core/src/main/java/org/springframework/core/convert/support/ArrayToCollectionConverter.java

@@ -22,27 +22,25 @@ import java.util.Collections;
 import java.util.Set;
 
 import org.springframework.core.CollectionFactory;
-import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
-import org.springframework.core.convert.converter.GenericConverter;
 
 /**
  * Converts an Array to a Collection.
  *
  * <p>First, creates a new Collection of the requested targetType.
  * Then adds each array element to the target collection.
- * Will perform an element conversion from the source component type
- * to the collection's parameterized type if necessary.
+ * Will perform an element conversion from the source component type to the collection's parameterized type if necessary.
  * 
  * @author Keith Donald
  * @since 3.0
  */
 final class ArrayToCollectionConverter implements ConditionalGenericConverter {
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public ArrayToCollectionConverter(GenericConversionService conversionService) {
+	public ArrayToCollectionConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -57,30 +55,16 @@ final class ArrayToCollectionConverter implements ConditionalGenericConverter {
 	@SuppressWarnings("unchecked")
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
+			return null;
 		}		
 		int length = Array.getLength(source);
-		Collection collection = CollectionFactory.createCollection(targetType.getType(), length);
-		TypeDescriptor sourceElementType = sourceType.getElementTypeDescriptor();
-		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
-		if (targetElementType == TypeDescriptor.NULL || sourceElementType.isAssignableTo(targetElementType)) {
-			for (int i = 0; i < length; i++) {
-				collection.add(Array.get(source, i));
-			}
+		Collection target = CollectionFactory.createCollection(targetType.getType(), length);
+		for (int i = 0; i < length; i++) {
+			Object sourceElement = Array.get(source, i);
+			Object targetElement = this.conversionService.convert(sourceElement, sourceType.getElementTypeDescriptor(), targetType.getElementTypeDescriptor(sourceElement));
+			target.add(targetElement);
 		}
-		else {
-			GenericConverter converter = this.conversionService.getConverter(sourceElementType, targetElementType);
-			if (converter == null) {
-				throw new ConverterNotFoundException(sourceElementType, targetElementType);
-			}
-			for (int i = 0; i < length; i++) {
-				Object sourceElement = Array.get(source, i);
-				Object targetElement = ConversionUtils.invokeConverter(
-						converter, sourceElement, sourceElementType, targetElementType);
-				collection.add(targetElement);
-			}
-		}
-		return collection;
+		return target;
 	}
 
 }

org.springframework.core/src/main/java/org/springframework/core/convert/support/ArrayToObjectConverter.java

@@ -20,6 +20,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.Set;
 
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
 import org.springframework.util.ObjectUtils;
@@ -35,7 +36,7 @@ final class ArrayToObjectConverter implements ConditionalGenericConverter {
 
 	private final CollectionToObjectConverter helperConverter;
 
-	public ArrayToObjectConverter(GenericConversionService conversionService) {
+	public ArrayToObjectConverter(ConversionService conversionService) {
 		this.helperConverter = new CollectionToObjectConverter(conversionService);
 	}
 

org.springframework.core/src/main/java/org/springframework/core/convert/support/ArrayToStringConverter.java

@@ -20,6 +20,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.Set;
 
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
 import org.springframework.util.ObjectUtils;
@@ -35,7 +36,7 @@ final class ArrayToStringConverter implements ConditionalGenericConverter {
 
 	private final CollectionToStringConverter helperConverter;
 
-	public ArrayToStringConverter(GenericConversionService conversionService) {
+	public ArrayToStringConverter(ConversionService conversionService) {
 		this.helperConverter = new CollectionToStringConverter(conversionService);
 	}
 

org.springframework.core/src/main/java/org/springframework/core/convert/support/CollectionToArrayConverter.java

@@ -19,13 +19,11 @@ package org.springframework.core.convert.support;
 import java.lang.reflect.Array;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.Iterator;
 import java.util.Set;
 
-import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
-import org.springframework.core.convert.converter.GenericConverter;
 
 /**
  * Converts a Collection to an array.
@@ -40,9 +38,9 @@ import org.springframework.core.convert.converter.GenericConverter;
  */
 final class CollectionToArrayConverter implements ConditionalGenericConverter {
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public CollectionToArrayConverter(GenericConversionService conversionService) {
+	public CollectionToArrayConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -56,32 +54,14 @@ final class CollectionToArrayConverter implements ConditionalGenericConverter {
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
-		}		
-		Collection<?> sourceCollection = (Collection<?>) source;
-		TypeDescriptor sourceElementType = sourceType.getElementTypeDescriptor();
-		if (sourceElementType == TypeDescriptor.NULL) {
-			sourceElementType = ConversionUtils.getElementType(sourceCollection);
+			return null;
 		}
-		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
-		Object array = Array.newInstance(targetElementType.getType(), sourceCollection.size());
+		Collection<?> sourceCollection = (Collection<?>) source;
+		Object array = Array.newInstance(targetType.getElementType(), sourceCollection.size());
 		int i = 0;
-		if (sourceElementType == TypeDescriptor.NULL || sourceElementType.isAssignableTo(targetElementType)) {
-			for (Iterator<?> it = sourceCollection.iterator(); it.hasNext(); i++) {
-				Array.set(array, i, it.next());
-			}
-		}
-		else {
-			GenericConverter converter = this.conversionService.getConverter(sourceElementType, targetElementType);
-			if (converter == null) {
-				throw new ConverterNotFoundException(sourceElementType, targetElementType);
-			}
-			for (Iterator<?> it = sourceCollection.iterator(); it.hasNext(); i++) {
-				Object sourceElement = it.next();
-				Object targetElement = ConversionUtils.invokeConverter(
-						converter, sourceElement, sourceElementType, targetElementType);
-				Array.set(array, i, targetElement);
-			}
+		for (Object sourceElement : sourceCollection) {
+			Object targetElement = this.conversionService.convert(sourceElement, sourceType.getElementTypeDescriptor(sourceElement), targetType.getElementTypeDescriptor());
+			Array.set(array, i++, targetElement);
 		}
 		return array;
 	}

org.springframework.core/src/main/java/org/springframework/core/convert/support/CollectionToCollectionConverter.java

@@ -21,10 +21,9 @@ import java.util.Collections;
 import java.util.Set;
 
 import org.springframework.core.CollectionFactory;
-import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
-import org.springframework.core.convert.converter.GenericConverter;
 
 /**
  * Converts from a Collection to another Collection.
@@ -39,9 +38,9 @@ import org.springframework.core.convert.converter.GenericConverter;
  */
 final class CollectionToCollectionConverter implements ConditionalGenericConverter {
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public CollectionToCollectionConverter(GenericConversionService conversionService) {
+	public CollectionToCollectionConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -56,32 +55,13 @@ final class CollectionToCollectionConverter implements ConditionalGenericConvert
 	@SuppressWarnings("unchecked")
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
+			return null;
 		}
 		Collection<?> sourceCollection = (Collection<?>) source;
-		TypeDescriptor sourceElementType = sourceType.getElementTypeDescriptor();
-		if (sourceElementType == TypeDescriptor.NULL) {
-			sourceElementType = ConversionUtils.getElementType(sourceCollection);
-		}
-		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
-		if (sourceElementType == TypeDescriptor.NULL || targetElementType == TypeDescriptor.NULL
-				|| sourceElementType.isAssignableTo(targetElementType)) {
-			if (sourceType.isAssignableTo(targetType)) {
-				return sourceCollection;
-			}
-			else {
-				Collection target = CollectionFactory.createCollection(targetType.getType(), sourceCollection.size());
-				target.addAll(sourceCollection);
-				return target;
-			}
-		}
 		Collection target = CollectionFactory.createCollection(targetType.getType(), sourceCollection.size());
-		GenericConverter converter = this.conversionService.getConverter(sourceElementType, targetElementType);
-		if (converter == null) {
-			throw new ConverterNotFoundException(sourceElementType, targetElementType);
-		}
-		for (Object element : sourceCollection) {
-			target.add(ConversionUtils.invokeConverter(converter, element, sourceElementType, targetElementType));
+		for (Object sourceElement : sourceCollection) {
+			Object targetElement = this.conversionService.convert(sourceElement, sourceType.getElementTypeDescriptor(sourceElement), targetType.getElementTypeDescriptor(sourceElement));
+			target.add(targetElement);
 		}
 		return target;
 	}

org.springframework.core/src/main/java/org/springframework/core/convert/support/CollectionToObjectConverter.java

@@ -20,10 +20,9 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.Set;
 
-import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
-import org.springframework.core.convert.converter.GenericConverter;
 
 /**
  * Converts a Collection to an Object by returning the first collection element after converting it to the desired targetType.
@@ -33,9 +32,9 @@ import org.springframework.core.convert.converter.GenericConverter;
  */
 final class CollectionToObjectConverter implements ConditionalGenericConverter {
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public CollectionToObjectConverter(GenericConversionService conversionService) {
+	public CollectionToObjectConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -49,29 +48,14 @@ final class CollectionToObjectConverter implements ConditionalGenericConverter {
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
+			return null;
 		}
 		Collection<?> sourceCollection = (Collection<?>) source;
 		if (sourceCollection.size() == 0) {
 			return null;
 		}
-		else {
-			Object firstElement = sourceCollection.iterator().next();
-			TypeDescriptor sourceElementType = sourceType.getElementTypeDescriptor();
-			if (sourceElementType == TypeDescriptor.NULL && firstElement != null) {
-				sourceElementType = TypeDescriptor.valueOf(firstElement.getClass());
-			}
-			if (sourceElementType == TypeDescriptor.NULL || sourceElementType.isAssignableTo(targetType)) {
-				return firstElement;
-			}
-			else {
-				GenericConverter converter = this.conversionService.getConverter(sourceElementType, targetType);
-				if (converter == null) {
-					throw new ConverterNotFoundException(sourceElementType, targetType);
-				}
-				return ConversionUtils.invokeConverter(converter, firstElement, sourceElementType, targetType);
-			}
-		}
+		Object firstElement = sourceCollection.iterator().next();
+		return this.conversionService.convert(firstElement, sourceType.getElementTypeDescriptor(firstElement), targetType);
 	}
 
-}
+}

org.springframework.core/src/main/java/org/springframework/core/convert/support/CollectionToStringConverter.java

@@ -20,10 +20,9 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.Set;
 
-import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
-import org.springframework.core.convert.converter.GenericConverter;
 
 /**
  * Converts a Collection to a comma-delimited String.
@@ -35,9 +34,9 @@ final class CollectionToStringConverter implements ConditionalGenericConverter {
 
 	private static final String DELIMITER = ",";
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public CollectionToStringConverter(GenericConversionService conversionService) {
+	public CollectionToStringConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -51,48 +50,23 @@ final class CollectionToStringConverter implements ConditionalGenericConverter {
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
+			return null;
 		}
 		Collection<?> sourceCollection = (Collection<?>) source;
 		if (sourceCollection.size() == 0) {
 			return "";
 		}
-		else {
-			TypeDescriptor sourceElementType = sourceType.getElementTypeDescriptor();
-			if (sourceElementType == TypeDescriptor.NULL) {
-				sourceElementType = ConversionUtils.getElementType(sourceCollection);
-			}
-			if (sourceElementType == TypeDescriptor.NULL || sourceElementType.isAssignableTo(targetType)) {
-				StringBuilder string = new StringBuilder();
-				int i = 0;
-				for (Object element : sourceCollection) {
-					if (i > 0) {
-						string.append(DELIMITER);
-					}
-					string.append(element);
-					i++;
-				}
-				return string.toString();
-			}
-			else {
-				GenericConverter converter = this.conversionService.getConverter(sourceElementType, targetType);
-				if (converter == null) {
-					throw new ConverterNotFoundException(sourceElementType, targetType);
-				}
-				StringBuilder string = new StringBuilder();
-				int i = 0;
-				for (Object sourceElement : sourceCollection) {
-					if (i > 0) {
-						string.append(DELIMITER);
-					}
-					Object targetElement = ConversionUtils.invokeConverter(
-							converter, sourceElement, sourceElementType, targetType);
-					string.append(targetElement);
-					i++;
-				}
-				return string.toString();
+		StringBuilder string = new StringBuilder();
+		int i = 0;
+		for (Object sourceElement : sourceCollection) {
+			if (i > 0) {
+				string.append(DELIMITER);
 			}
+			Object targetElement = this.conversionService.convert(sourceElement, sourceType.getElementTypeDescriptor(sourceElement), targetType);
+			string.append(targetElement);
+			i++;
 		}
+		return string.toString();
 	}
 
 }

org.springframework.core/src/main/java/org/springframework/core/convert/support/GenericConversionService.java

@@ -30,6 +30,7 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.core.GenericTypeResolver;
+import org.springframework.core.convert.ConversionException;
 import org.springframework.core.convert.ConversionFailedException;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.ConverterNotFoundException;
@@ -39,6 +40,7 @@ import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.converter.ConverterFactory;
 import org.springframework.core.convert.converter.ConverterRegistry;
 import org.springframework.core.convert.converter.GenericConverter;
+import org.springframework.core.style.StylerUtils;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 
@@ -113,29 +115,68 @@ public class GenericConversionService implements ConversionService, ConverterReg
 
 	public boolean canConvert(TypeDescriptor sourceType, TypeDescriptor targetType) {
 		assertNotNull(sourceType, targetType);
+		if (logger.isDebugEnabled()) {
+			logger.debug("Checking if I can convert " + sourceType + " to " + targetType);
+		}		
 		if (sourceType == TypeDescriptor.NULL || targetType == TypeDescriptor.NULL) {
+			if (logger.isDebugEnabled()) {
+				logger.debug("Yes, I can convert");
+			}
+			return true;
+		}
+		GenericConverter converter = getConverter(sourceType, targetType);
+		if (converter != null) {
+			if (logger.isDebugEnabled()) {
+				logger.debug("Yes, I can convert");
+			}
 			return true;
+		} else {
+			if (logger.isDebugEnabled()) {
+				logger.debug("No, I cannot convert");
+			}
+			return false;
 		}
-		return getConverter(sourceType, targetType) != null;
 	}
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		assertNotNull(sourceType, targetType);
 		if (logger.isDebugEnabled()) {
-			logger.debug("Converting value of " + sourceType + " to " + targetType);
+			logger.debug("Converting value " + StylerUtils.style(source) + " of " + sourceType + " to " + targetType);
 		}
 		if (sourceType == TypeDescriptor.NULL) {
-			Assert.isTrue(source == null, "The source must be null if sourceType == TypeDescriptor.NULL");
-			return convertNullSource(sourceType, targetType);			
+			Assert.isTrue(source == null, "The value must be null if sourceType == TypeDescriptor.NULL");
+			Object result = convertNullSource(sourceType, targetType);
+			if (logger.isDebugEnabled()) {
+				logger.debug("Converted to " + StylerUtils.style(result));
+			}			
+			return result;
 		}
 		if (targetType == TypeDescriptor.NULL) {
+			if (logger.isDebugEnabled()) {
+				logger.debug("Converted to null");
+			}
 			return null;
 		}
 		GenericConverter converter = getConverter(sourceType, targetType);
 		if (converter == null) {
-			throw new ConverterNotFoundException(sourceType, targetType);
+			ConverterNotFoundException e = new ConverterNotFoundException(sourceType, targetType);
+			if (logger.isDebugEnabled()) {
+				logger.debug(e);
+			}
+			throw e;
+		}
+		try {
+			Object result = ConversionUtils.invokeConverter(converter, source, sourceType, targetType);
+			if (logger.isDebugEnabled()) {
+				logger.debug("Converted to " + StylerUtils.style(result));
+			}
+			return result;
+		} catch (ConversionException e) {
+			if (logger.isDebugEnabled()) {
+				logger.debug(e);
+			}
+			throw e;
 		}
-		return ConversionUtils.invokeConverter(converter, source, sourceType, targetType);
 	}
 
 	public String toString() {
@@ -197,7 +238,7 @@ public class GenericConversionService implements ConversionService, ConverterReg
 
 	/**
 	 * Return the default converter if no converter is found for the given sourceType/targetType pair.
-	 * Returns a NO_OP Converter if the sourceType is assignalbe to the targetType.
+	 * Returns a NO_OP Converter if the sourceType is assignable to the targetType.
 	 * Returns <code>null</code> otherwise, indicating no suitable converter could be found.
 	 * Subclasses may override.
 	 * @param sourceType the source type to convert from
@@ -366,7 +407,6 @@ public class GenericConversionService implements ConversionService, ConverterReg
 
 	private GenericConverter matchConverter(
 			MatchableConverters matchable, TypeDescriptor sourceFieldType, TypeDescriptor targetFieldType) {
-
 		return (matchable != null ? matchable.matchConverter(sourceFieldType, targetFieldType) : null);
 	}
 
@@ -453,19 +493,19 @@ public class GenericConversionService implements ConversionService, ConverterReg
 				for (ConditionalGenericConverter conditional : this.conditionalConverters) {
 					if (conditional.matches(sourceType, targetType)) {
 						if (logger.isDebugEnabled()) {
-							logger.debug("Conditional converter lookup [MATCHED] " + conditional);
+							logger.debug("[MATCHED] converter " + conditional);
 						}
 						return conditional;
 					}
 					else {
 						if (logger.isDebugEnabled()) {
-							logger.debug("Conditional converter lookup [DID NOT MATCH] " + conditional);
+							logger.debug("[DID NOT MATCH] converter " + conditional);
 						}
 					}
 				}
 			}
 			if (this.defaultConverter != null && logger.isDebugEnabled()) {
-				logger.debug("Default converter lookup [MATCHED] " + this.defaultConverter);
+				logger.debug("[MATCHED] converter " + this.defaultConverter);
 			}			
 			return this.defaultConverter;
 		}

org.springframework.core/src/main/java/org/springframework/core/convert/support/MapToMapConverter.java

@@ -21,6 +21,7 @@ import java.util.Map;
 import java.util.Set;
 
 import org.springframework.core.CollectionFactory;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
 
@@ -37,9 +38,9 @@ import org.springframework.core.convert.converter.ConditionalGenericConverter;
  */
 final class MapToMapConverter implements ConditionalGenericConverter {
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public MapToMapConverter(GenericConversionService conversionService) {
+	public MapToMapConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -55,57 +56,19 @@ final class MapToMapConverter implements ConditionalGenericConverter {
 	@SuppressWarnings("unchecked")
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
+			return null;
 		}
 		Map<?, ?> sourceMap = (Map<?, ?>) source;
-		TypeDescriptor targetKeyType = targetType.getMapKeyTypeDescriptor();
-		TypeDescriptor targetValueType = targetType.getMapValueTypeDescriptor();
-		if (targetKeyType == TypeDescriptor.NULL && targetValueType == TypeDescriptor.NULL) {
-			return compatibleMapWithoutEntryConversion(sourceMap, targetType);
-		}
-		TypeDescriptor sourceKeyType = sourceType.getMapKeyTypeDescriptor();
-		TypeDescriptor sourceValueType = sourceType.getMapValueTypeDescriptor();
-		if (sourceKeyType == TypeDescriptor.NULL || sourceValueType == TypeDescriptor.NULL) {
-			TypeDescriptor[] sourceEntryTypes = ConversionUtils.getMapEntryTypes(sourceMap);
-			sourceKeyType = sourceEntryTypes[0];
-			sourceValueType = sourceEntryTypes[1];
-		}
-		if (sourceKeyType == TypeDescriptor.NULL && sourceValueType == TypeDescriptor.NULL) {
-			return compatibleMapWithoutEntryConversion(sourceMap, targetType);
-		}
-		boolean keysCompatible = false;
-		if (sourceKeyType != TypeDescriptor.NULL && sourceKeyType.isAssignableTo(targetKeyType)) {
-			keysCompatible = true;
-		}
-		boolean valuesCompatible = false;
-		if (sourceValueType != TypeDescriptor.NULL && sourceValueType.isAssignableTo(targetValueType)) {
-			valuesCompatible = true;
-		}
-		if (keysCompatible && valuesCompatible) {
-			return compatibleMapWithoutEntryConversion(sourceMap, targetType);
-		}
 		Map targetMap = CollectionFactory.createMap(targetType.getType(), sourceMap.size());
-		MapEntryConverter converter = new MapEntryConverter(sourceKeyType, sourceValueType, targetKeyType,
-				targetValueType, keysCompatible, valuesCompatible, this.conversionService);
 		for (Object entry : sourceMap.entrySet()) {
 			Map.Entry sourceMapEntry = (Map.Entry) entry;
-			Object targetKey = converter.convertKey(sourceMapEntry.getKey());
-			Object targetValue = converter.convertValue(sourceMapEntry.getValue());
+			Object sourceKey = sourceMapEntry.getKey();
+			Object sourceValue = sourceMapEntry.getValue();
+			Object targetKey = this.conversionService.convert(sourceKey, sourceType.getMapKeyTypeDescriptor(sourceKey), targetType.getMapKeyTypeDescriptor(sourceKey));
+			Object targetValue = this.conversionService.convert(sourceValue, sourceType.getMapValueTypeDescriptor(sourceValue), targetType.getMapValueTypeDescriptor(sourceValue));
 			targetMap.put(targetKey, targetValue);
 		}
 		return targetMap;
 	}
-
-	@SuppressWarnings("unchecked")
-	private Map<?, ?> compatibleMapWithoutEntryConversion(Map<?, ?> source, TypeDescriptor targetType) {
-		if (targetType.getType().isInstance(source)) {
-			return source;
-		}
-		else {
-			Map target = CollectionFactory.createMap(targetType.getType(), source.size());
-			target.putAll(source);
-			return target;
-		}
-	}
-
+	
 }

org.springframework.core/src/main/java/org/springframework/core/convert/support/ObjectToArrayConverter.java

@@ -20,10 +20,9 @@ import java.lang.reflect.Array;
 import java.util.Collections;
 import java.util.Set;
 
-import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
-import org.springframework.core.convert.converter.GenericConverter;
 
 /**
  * Converts an Object to a single-element Array containing the Object.
@@ -34,9 +33,9 @@ import org.springframework.core.convert.converter.GenericConverter;
  */
 final class ObjectToArrayConverter implements ConditionalGenericConverter {
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public ObjectToArrayConverter(GenericConversionService conversionService) {
+	public ObjectToArrayConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -50,20 +49,11 @@ final class ObjectToArrayConverter implements ConditionalGenericConverter {
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
-		}
-		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
-		Object target = Array.newInstance(targetElementType.getType(), 1);
-		if (sourceType.isAssignableTo(targetElementType)) {
-			Array.set(target, 0, source);
-		}
-		else {
-			GenericConverter converter = this.conversionService.getConverter(sourceType, targetElementType);
-			if (converter == null) {
-				throw new ConverterNotFoundException(sourceType, targetElementType);
-			}
-			Array.set(target, 0, ConversionUtils.invokeConverter(converter, source, sourceType, targetElementType));
+			return null;
 		}
+		Object target = Array.newInstance(targetType.getElementType(), 1);
+		Object targetElement = this.conversionService.convert(source, sourceType, targetType.getElementTypeDescriptor());
+		Array.set(target, 0, targetElement);
 		return target;
 	}
 

org.springframework.core/src/main/java/org/springframework/core/convert/support/ObjectToCollectionConverter.java

@@ -21,10 +21,9 @@ import java.util.Collections;
 import java.util.Set;
 
 import org.springframework.core.CollectionFactory;
-import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
-import org.springframework.core.convert.converter.GenericConverter;
 
 /**
  * Converts an Object to a single-element Collection containing the Object.
@@ -35,9 +34,9 @@ import org.springframework.core.convert.converter.GenericConverter;
  */
 final class ObjectToCollectionConverter implements ConditionalGenericConverter {
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public ObjectToCollectionConverter(GenericConversionService conversionService) {
+	public ObjectToCollectionConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -52,20 +51,11 @@ final class ObjectToCollectionConverter implements ConditionalGenericConverter {
 	@SuppressWarnings("unchecked")
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
+			return null;
 		}
 		Collection target = CollectionFactory.createCollection(targetType.getType(), 1);
-		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
-		if (targetElementType == TypeDescriptor.NULL || sourceType.isAssignableTo(targetElementType)) {
-			target.add(source);
-		}
-		else {
-			GenericConverter converter = this.conversionService.getConverter(sourceType, targetElementType);
-			if (converter == null) {
-				throw new ConverterNotFoundException(sourceType, targetElementType);
-			}
-			target.add(ConversionUtils.invokeConverter(converter, source, sourceType, targetElementType));
-		}
+		Object targetElement = this.conversionService.convert(source, sourceType, targetType.getElementTypeDescriptor(source));
+		target.add(targetElement);
 		return target;
 	}
 

org.springframework.core/src/main/java/org/springframework/core/convert/support/ObjectToObjectConverter.java

@@ -52,9 +52,6 @@ final class ObjectToObjectConverter implements ConditionalGenericConverter {
 	}
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
-		if (sourceType.isAssignableTo(targetType)) {
-			return source;
-		}
 		Class<?> sourceClass = sourceType.getObjectType();
 		Class<?> targetClass = targetType.getObjectType();
 		Object target;

org.springframework.core/src/main/java/org/springframework/core/convert/support/ObjectToStringConverter.java

@@ -43,10 +43,10 @@ final class ObjectToStringConverter implements ConditionalGenericConverter {
 
 	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
 		Class<?> sourceClass = sourceType.getObjectType();
-		return Number.class.isAssignableFrom(sourceClass) || Boolean.class.equals(sourceClass) ||
-				Character.class.equals(sourceClass) || CharSequence.class.isAssignableFrom(sourceClass) ||
-				StringWriter.class.isAssignableFrom(sourceClass) || sourceClass.isEnum() ||
-				ObjectToObjectConverter.hasValueOfMethodOrConstructor(sourceClass, String.class);
+		return String.class.equals(sourceClass) || Number.class.isAssignableFrom(sourceClass) || 
+				Boolean.class.equals(sourceClass) || Character.class.equals(sourceClass) ||
+				CharSequence.class.isAssignableFrom(sourceClass) || StringWriter.class.isAssignableFrom(sourceClass) ||
+				sourceClass.isEnum() || ObjectToObjectConverter.hasValueOfMethodOrConstructor(sourceClass, String.class);
 	}
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {

org.springframework.core/src/main/java/org/springframework/core/convert/support/PropertyTypeDescriptor.java

@@ -75,10 +75,10 @@ public class PropertyTypeDescriptor extends TypeDescriptor {
 	public Annotation[] getAnnotations() {
 		Annotation[] anns = this.cachedAnnotations;
 		if (anns == null) {
-			Map<Class, Annotation> annMap = new LinkedHashMap<Class, Annotation>();
+			Map<Class<?>, Annotation> annMap = new LinkedHashMap<Class<?>, Annotation>();
 			String name = this.propertyDescriptor.getName();
 			if (StringUtils.hasLength(name)) {
-				Class clazz = getMethodParameter().getMethod().getDeclaringClass();
+				Class<?> clazz = getMethodParameter().getMethod().getDeclaringClass();
 				Field field = ReflectionUtils.findField(clazz, name);
 				if (field == null) {
 					// Same lenient fallback checking as in CachedIntrospectionResults...

org.springframework.core/src/main/java/org/springframework/core/convert/support/StringToArrayConverter.java

@@ -20,10 +20,9 @@ import java.lang.reflect.Array;
 import java.util.Collections;
 import java.util.Set;
 
-import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
-import org.springframework.core.convert.converter.GenericConverter;
 import org.springframework.util.StringUtils;
 
 /**
@@ -34,9 +33,9 @@ import org.springframework.util.StringUtils;
  */
 final class StringToArrayConverter implements ConditionalGenericConverter {
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public StringToArrayConverter(GenericConversionService conversionService) {
+	public StringToArrayConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -50,25 +49,17 @@ final class StringToArrayConverter implements ConditionalGenericConverter {
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
+			return null;
 		}		
 		String string = (String) source;
 		String[] fields = StringUtils.commaDelimitedListToStringArray(string);
-		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
-		if (sourceType.isAssignableTo(targetElementType)) {
-			return fields;
-		}
-		else {
-			Object target = Array.newInstance(targetElementType.getType(), fields.length);
-			GenericConverter converter = this.conversionService.getConverter(sourceType, targetElementType);
-			if (converter == null) {
-				throw new ConverterNotFoundException(sourceType, targetElementType);
-			}
-			for (int i = 0; i < fields.length; i++) {
-				Array.set(target, i, ConversionUtils.invokeConverter(converter, fields[i], sourceType, targetElementType));
-			}
-			return target;
+		Object target = Array.newInstance(targetType.getElementType(), fields.length);
+		for (int i = 0; i < fields.length; i++) {
+			Object sourceElement = fields[i];
+			Object targetElement = this.conversionService.convert(sourceElement, sourceType, targetType.getElementTypeDescriptor());
+			Array.set(target, i, targetElement);
 		}
+		return target;
 	}
 
 }

org.springframework.core/src/main/java/org/springframework/core/convert/support/StringToCollectionConverter.java

@@ -21,10 +21,9 @@ import java.util.Collections;
 import java.util.Set;
 
 import org.springframework.core.CollectionFactory;
-import org.springframework.core.convert.ConverterNotFoundException;
+import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.ConditionalGenericConverter;
-import org.springframework.core.convert.converter.GenericConverter;
 import org.springframework.util.StringUtils;
 
 /**
@@ -35,9 +34,9 @@ import org.springframework.util.StringUtils;
  */
 final class StringToCollectionConverter implements ConditionalGenericConverter {
 
-	private final GenericConversionService conversionService;
+	private final ConversionService conversionService;
 
-	public StringToCollectionConverter(GenericConversionService conversionService) {
+	public StringToCollectionConverter(ConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
 
@@ -52,27 +51,14 @@ final class StringToCollectionConverter implements ConditionalGenericConverter {
 	@SuppressWarnings("unchecked")
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {		
 		if (source == null) {
-			return this.conversionService.convertNullSource(sourceType, targetType);
+			return null;
 		}
 		String string = (String) source;
 		String[] fields = StringUtils.commaDelimitedListToStringArray(string);
 		Collection target = CollectionFactory.createCollection(targetType.getType(), fields.length);
-		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
-		if (targetElementType == TypeDescriptor.NULL || sourceType.isAssignableTo(targetElementType)) {
-			for (String field : fields) {
-				target.add(field);
-			}
-		}
-		else {
-			GenericConverter converter = this.conversionService.getConverter(sourceType, targetElementType);
-			if (converter == null) {
-				throw new ConverterNotFoundException(sourceType, targetElementType);
-			}
-			for (String sourceElement : fields) {
-				Object targetElement = ConversionUtils.invokeConverter(
-						converter, sourceElement, sourceType, targetElementType);
-				target.add(targetElement);
-			}
+		for (String sourceElement : fields) {
+			Object targetElement = this.conversionService.convert(sourceElement, sourceType, targetType.getElementTypeDescriptor(sourceElement));
+			target.add(targetElement);
 		}
 		return target;
 	}

org.springframework.core/src/test/java/org/springframework/core/convert/TypeDescriptorTests.java

@@ -56,7 +56,7 @@ public class TypeDescriptorTests {
 		assertTrue(typeDescriptor.isArray());
 		assertEquals(Integer.TYPE,typeDescriptor.getElementType());
 	}
-
+	
 	@Test
 	public void complexTypeDescriptors() throws Exception {
 		TypeDescriptor typeDescriptor = new TypeDescriptor(TypeDescriptorTests.class.getDeclaredField("arrayOfListOfString"));

org.springframework.core/src/test/java/org/springframework/core/convert/support/GenericConversionServiceTests.java

@@ -39,19 +39,20 @@ public class GenericConversionServiceTests {
 	private GenericConversionService conversionService = new GenericConversionService();
 
 	@Test
-	public void executeConversion() {
+	public void convert() {
 		conversionService.addConverterFactory(new StringToNumberConverterFactory());
 		assertEquals(new Integer(3), conversionService.convert("3", Integer.class));
 	}
 
 	@Test
-	public void executeConversionNullSource() {
+	public void convertNullSource() {
 		assertEquals(null, conversionService.convert(null, Integer.class));
 	}
 
 	@Test
-	public void executeCompatibleSource() {
+	public void convertAssignableSource() {
 		assertEquals(Boolean.FALSE, conversionService.convert(false, boolean.class));
+		assertEquals(Boolean.FALSE, conversionService.convert(false, Boolean.class));
 	}
 
 	@Test
@@ -189,7 +190,7 @@ public class GenericConversionServiceTests {
 		input.put("key", "value");
 		Object converted = conversionService.convert(input, TypeDescriptor.forObject(input),
 				new TypeDescriptor(getClass().getField("wildcardMap")));
-		assertSame(input, converted);
+		assertEquals(input, converted);
 	}
 
 

org.springframework.expression/src/main/java/org/springframework/expression/TypedValue.java

@@ -72,7 +72,7 @@ public class TypedValue {
 	@Override
 	public String toString() {
 		StringBuilder str = new StringBuilder();
-		str.append("TypedValue: ").append(this.value).append(" of type ").append(this.getTypeDescriptor().asString());
+		str.append("TypedValue: ").append(this.value).append(" of ").append(this.getTypeDescriptor());
 		return str.toString();
 	}
 

org.springframework.expression/src/test/java/org/springframework/expression/spel/HelperTests.java

@@ -29,12 +29,12 @@ import org.springframework.expression.ParseException;
 import org.springframework.expression.PropertyAccessor;
 import org.springframework.expression.TypedValue;
 import org.springframework.expression.spel.ast.FormatHelper;
+import org.springframework.expression.spel.standard.SpelExpression;
 import org.springframework.expression.spel.support.ReflectionHelper;
 import org.springframework.expression.spel.support.ReflectivePropertyAccessor;
 import org.springframework.expression.spel.support.StandardEvaluationContext;
 import org.springframework.expression.spel.support.StandardTypeConverter;
 import org.springframework.expression.spel.support.ReflectionHelper.ArgsMatchKind;
-import org.springframework.expression.spel.standard.SpelExpression;
 
 /**
  * Tests for any helper code.
@@ -94,7 +94,7 @@ public class HelperTests extends ExpressionTestCase {
 	public void testTypedValue() {
 		TypedValue tValue = new TypedValue("hello");
 		Assert.assertEquals(String.class,tValue.getTypeDescriptor().getType());
-		Assert.assertEquals("TypedValue: hello of type java.lang.String",tValue.toString());
+		Assert.assertEquals("TypedValue: hello of [TypeDescriptor java.lang.String]",tValue.toString());
 	}
 	
 	@Test