MappingJackson2JsonView/MessageConverter calls non-deprecated Jackson 2.1+ createGenerator API

Also removing workaround for https://github.com/FasterXML/jackson-databind/issues/12 (fixed in 2.1+)

Issue: SPR-11262

spring-messaging/src/main/java/org/springframework/messaging/converter/MappingJackson2MessageConverter.java

@@ -39,7 +39,7 @@ import org.springframework.util.MimeType;
 /**
  * A Jackson 2 based {@link MessageConverter} implementation.
  *
- * <p>Tested against Jackson 2.2 and 2.3; compatible with Jackson 2.0 and higher.
+ * <p>Compatible with Jackson 2.1 and higher.
  *
  * @author Rossen Stoyanchev
  * @author Juergen Hoeller
@@ -183,18 +183,7 @@ public class MappingJackson2MessageConverter extends AbstractMessageConverter {
 			if (byte[].class.equals(getSerializedPayloadClass())) {
 				ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
 				JsonEncoding encoding = getJsonEncoding(getMimeType(headers));
-
-				// The following has been deprecated as late as Jackson 2.2 (April 2013);
-				// preserved for the time being, for Jackson 2.0/2.1 compatibility.
-				@SuppressWarnings("deprecation")
-				JsonGenerator generator = this.objectMapper.getJsonFactory().createJsonGenerator(out, encoding);
-
-				// A workaround for JsonGenerators not applying serialization features
-				// https://github.com/FasterXML/jackson-databind/issues/12
-				if (this.objectMapper.isEnabled(SerializationFeature.INDENT_OUTPUT)) {
-					generator.useDefaultPrettyPrinter();
-				}
-
+				JsonGenerator generator = this.objectMapper.getFactory().createGenerator(out, encoding);
 				this.objectMapper.writeValue(generator, payload);
 				payload = out.toByteArray();
 			}

spring-web/src/main/java/org/springframework/http/converter/json/MappingJackson2HttpMessageConverter.java

@@ -48,7 +48,7 @@ import org.springframework.util.ClassUtils;
  * <p>By default, this converter supports {@code application/json}. This can be overridden by setting the
  * {@link #setSupportedMediaTypes supportedMediaTypes} property.
  *
- * <p>Tested against Jackson 2.2 and 2.3; compatible with Jackson 2.0 and higher.
+ * <p>Compatible with Jackson 2.1 and higher.
  *
  * @author Arjen Poutsma
  * @author Keith Donald
@@ -233,21 +233,10 @@ public class MappingJackson2HttpMessageConverter extends AbstractHttpMessageConv
 			throws IOException, HttpMessageNotWritableException {
 
 		JsonEncoding encoding = getJsonEncoding(outputMessage.getHeaders().getContentType());
-		// The following has been deprecated as late as Jackson 2.2 (April 2013);
-		// preserved for the time being, for Jackson 2.0/2.1 compatibility.
-		@SuppressWarnings("deprecation")
-		JsonGenerator jsonGenerator =
-				this.objectMapper.getJsonFactory().createJsonGenerator(outputMessage.getBody(), encoding);
-
-		// A workaround for JsonGenerators not applying serialization features
-		// https://github.com/FasterXML/jackson-databind/issues/12
-		if (this.objectMapper.isEnabled(SerializationFeature.INDENT_OUTPUT)) {
-			jsonGenerator.useDefaultPrettyPrinter();
-		}
-
+		JsonGenerator generator = this.objectMapper.getFactory().createGenerator(outputMessage.getBody(), encoding);
 		try {
 			if (this.jsonPrefix != null) {
-				jsonGenerator.writeRaw(this.jsonPrefix);
+				generator.writeRaw(this.jsonPrefix);
 			}
 			Class<?> serializationView = null;
 			String jsonpFunction = null;
@@ -258,17 +247,17 @@ public class MappingJackson2HttpMessageConverter extends AbstractHttpMessageConv
 				jsonpFunction = container.getJsonpFunction();
 			}
 			if (jsonpFunction != null) {
-				jsonGenerator.writeRaw(jsonpFunction + "(" );
+				generator.writeRaw(jsonpFunction + "(");
 			}
 			if (serializationView != null) {
-				this.objectMapper.writerWithView(serializationView).writeValue(jsonGenerator, object);
+				this.objectMapper.writerWithView(serializationView).writeValue(generator, object);
 			}
 			else {
-				this.objectMapper.writeValue(jsonGenerator, object);
+				this.objectMapper.writeValue(generator, object);
 			}
 			if (jsonpFunction != null) {
-				jsonGenerator.writeRaw(");");
-				jsonGenerator.flush();
+				generator.writeRaw(");");
+				generator.flush();
 			}
 		}
 		catch (JsonProcessingException ex) {

spring-webmvc/src/main/java/org/springframework/web/servlet/view/json/MappingJackson2JsonView.java

@@ -19,7 +19,12 @@ package org.springframework.web.servlet.view.json;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
-import java.util.*;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashSet;
+import java.util.Map;
+import java.util.Set;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
@@ -45,6 +50,8 @@ import org.springframework.web.servlet.view.AbstractView;
  * will be encoded as JSON. If the model contains only one key, you can have it extracted encoded as JSON
  * alone via  {@link #setExtractValueFromSingleKeyModel}.
  *
+ * <p>Compatible with Jackson 2.1 and higher.
+ *
  * @author Jeremy Grelle
  * @author Arjen Poutsma
  * @author Rossen Stoyanchev
@@ -60,6 +67,9 @@ public class MappingJackson2JsonView extends AbstractView {
 	 */
 	public static final String DEFAULT_CONTENT_TYPE = "application/json";
 
+	/**
+	 * Default content type for JSONP: "application/javascript".
+	 */
 	public static final String DEFAULT_JSONP_CONTENT_TYPE = "application/javascript";
 
 
@@ -71,8 +81,6 @@ public class MappingJackson2JsonView extends AbstractView {
 
 	private Boolean prettyPrint;
 
-	private final List<String> jsonpParameterNames = new ArrayList<String>(Arrays.asList("jsonp", "callback"));
-
 	private Set<String> modelKeys;
 
 	private boolean extractValueFromSingleKeyModel = false;
@@ -81,6 +89,8 @@ public class MappingJackson2JsonView extends AbstractView {
 
 	private boolean updateContentLength = false;
 
+	private Set<String> jsonpParameterNames = new LinkedHashSet<String>(Arrays.asList("jsonp", "callback"));
+
 
 	/**
 	 * Construct a new {@code MappingJackson2JsonView}, setting the content type to {@code application/json}.
@@ -169,23 +179,6 @@ public class MappingJackson2JsonView extends AbstractView {
 		}
 	}
 
-	/**
-	 * Set JSONP request parameter names. Each time a request has one of those
-	 * parameters, the resulting JSON will be wrapped into a function named as
-	 * specified by the JSONP request parameter value.
-	 *
-	 * <p>The parameter names configured by default are "jsonp" and "callback".
-	 *
-	 * @since 4.1
-	 * @see <a href="http://en.wikipedia.org/wiki/JSONP">JSONP Wikipedia article</a>
-	 */
-	public void setJsonpParameterNames(Collection<String> jsonpParameters) {
-		this.jsonpParameterNames.clear();
-		if (jsonpParameters != null) {
-			this.jsonpParameterNames.addAll(jsonpParameters);
-		}
-	}
-
 	/**
 	 * Set the attribute in the model that should be rendered by this view.
 	 * When set, all other model attributes will be ignored.
@@ -257,6 +250,19 @@ public class MappingJackson2JsonView extends AbstractView {
 		this.updateContentLength = updateContentLength;
 	}
 
+	/**
+	 * Set JSONP request parameter names. Each time a request has one of those
+	 * parameters, the resulting JSON will be wrapped into a function named as
+	 * specified by the JSONP request parameter value.
+	 * <p>The parameter names configured by default are "jsonp" and "callback".
+	 * @since 4.1
+	 * @see <a href="http://en.wikipedia.org/wiki/JSONP">JSONP Wikipedia article</a>
+	 */
+	public void setJsonpParameterNames(Set<String> jsonpParameterNames) {
+		this.jsonpParameterNames = jsonpParameterNames;
+	}
+
+
 	@Override
 	protected void prepareResponse(HttpServletRequest request, HttpServletResponse response) {
 		setResponseContentType(request, response);
@@ -291,10 +297,12 @@ public class MappingJackson2JsonView extends AbstractView {
 	}
 
 	private String getJsonpParameterValue(HttpServletRequest request) {
-		for(String name : this.jsonpParameterNames) {
-			String value = request.getParameter(name);
-			if (!StringUtils.isEmpty(value)) {
-				return value;
+		if (this.jsonpParameterNames != null) {
+			for (String name : this.jsonpParameterNames) {
+				String value = request.getParameter(name);
+				if (!StringUtils.isEmpty(value)) {
+					return value;
+				}
 			}
 		}
 		return null;
@@ -310,11 +318,10 @@ public class MappingJackson2JsonView extends AbstractView {
 	 */
 	protected Object filterModel(Map<String, Object> model) {
 		Map<String, Object> result = new HashMap<String, Object>(model.size());
-		Set<String> renderedAttributes = (!CollectionUtils.isEmpty(this.modelKeys) ? this.modelKeys : model.keySet());
+		Set<String> modelKeys = (!CollectionUtils.isEmpty(this.modelKeys) ? this.modelKeys : model.keySet());
 		for (Map.Entry<String, Object> entry : model.entrySet()) {
-			if (!(entry.getValue() instanceof BindingResult)
-					&& renderedAttributes.contains(entry.getKey())
-					&& !entry.getKey().equals(JsonView.class.getName())) {
+			if (!(entry.getValue() instanceof BindingResult) && modelKeys.contains(entry.getKey()) &&
+					!entry.getKey().equals(JsonView.class.getName())) {
 				result.put(entry.getKey(), entry.getValue());
 			}
 		}
@@ -332,17 +339,7 @@ public class MappingJackson2JsonView extends AbstractView {
 	protected void writeContent(OutputStream stream, Object value, String jsonPrefix)
 			throws IOException {
 
-		// The following has been deprecated as late as Jackson 2.2 (April 2013);
-		// preserved for the time being, for Jackson 2.0/2.1 compatibility.
-		@SuppressWarnings("deprecation")
-		JsonGenerator generator = this.objectMapper.getJsonFactory().createJsonGenerator(stream, this.encoding);
-
-		// A workaround for JsonGenerators not applying serialization features
-		// https://github.com/FasterXML/jackson-databind/issues/12
-		if (this.objectMapper.isEnabled(SerializationFeature.INDENT_OUTPUT)) {
-			generator.useDefaultPrettyPrinter();
-		}
-
+		JsonGenerator generator = this.objectMapper.getFactory().createGenerator(stream, this.encoding);
 		if (jsonPrefix != null) {
 			generator.writeRaw(jsonPrefix);
 		}

spring-webmvc/src/test/java/org/springframework/web/servlet/view/json/MappingJackson2JsonViewTests.java

@@ -323,7 +323,7 @@ public class MappingJackson2JsonViewTests {
 		model.put("foo", "bar");
 		request.addParameter("otherparam", "value");
 		request.addParameter("custom", "jsonpCallback");
-		view.setJsonpParameterNames(Arrays.asList("jsonp", "callback", "custom"));
+		view.setJsonpParameterNames(new LinkedHashSet(Arrays.asList("jsonp", "callback", "custom")));
 
 		view.render(model, request, response);
 
@@ -338,8 +338,14 @@ public class MappingJackson2JsonViewTests {
 		assertEquals("application/json", response.getContentType());
 	}
 
-	public interface MyJacksonView1 {};
-	public interface MyJacksonView2 {};
+
+	public interface MyJacksonView1 {
+	}
+
+
+	public interface MyJacksonView2 {
+	}
+
 
 	@SuppressWarnings("unused")
 	public static class TestBeanSimple {
@@ -378,7 +384,6 @@ public class MappingJackson2JsonViewTests {
 
 	@JsonSerialize(using=TestBeanSimpleSerializer.class)
 	public static class TestBeanSimpleAnnotated extends TestBeanSimple {
-
 	}