added special handling of String array values for required fields, e.g. for WebRequestDataBinder (SPR-6552)

git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@2660 50f2f4bb-b051-0410-bef5-90022cba6387

org.springframework.context/src/main/java/org/springframework/validation/DataBinder.java

@@ -623,8 +623,17 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
 			}
 			for (String field : requiredFields) {
 				PropertyValue pv = propertyValues.get(field);
-				if (pv == null || pv.getValue() == null ||
-						(pv.getValue() instanceof String && !StringUtils.hasText((String) pv.getValue()))) {
+				boolean empty = (pv == null || pv.getValue() == null);
+				if (!empty) {
+					if (pv.getValue() instanceof String) {
+						empty = !StringUtils.hasText((String) pv.getValue());
+					}
+					else if (pv.getValue() instanceof String[]) {
+						String[] values = (String[]) pv.getValue();
+						empty = (values.length == 0 || !StringUtils.hasText(values[0]));
+					}
+				}
+				if (empty) {
 					// Use bind error processor to create FieldError.
 					getBindingErrorProcessor().processMissingFieldError(field, getInternalBindingResult());
 					// Remove property from property values to bind: