expose arrays as comma-delimited element String

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

@@ -18,6 +18,8 @@ package org.springframework.validation;
 
 import org.springframework.beans.PropertyAccessException;
 import org.springframework.context.support.DefaultMessageSourceResolvable;
+import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * Default {@link BindingErrorProcessor} implementation.
@@ -65,8 +67,12 @@ public class DefaultBindingErrorProcessor implements BindingErrorProcessor {
 		String field = ex.getPropertyName();
 		String[] codes = bindingResult.resolveMessageCodes(ex.getErrorCode(), field);
 		Object[] arguments = getArgumentsForBindError(bindingResult.getObjectName(), field);
+		Object rejectedValue = ex.getValue();
+		if (rejectedValue != null && rejectedValue.getClass().isArray()) {
+			rejectedValue = StringUtils.arrayToCommaDelimitedString(ObjectUtils.toObjectArray(rejectedValue));
+		}
 		bindingResult.addError(new FieldError(
-				bindingResult.getObjectName(), field, ex.getValue(), true,
+				bindingResult.getObjectName(), field, rejectedValue, true,
 				codes, arguments, ex.getLocalizedMessage()));
 	}
 

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/mvc/annotation/ServletAnnotationControllerTests.java

@@ -16,14 +16,6 @@
 
 package org.springframework.web.servlet.mvc.annotation;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertSame;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
-
 import java.io.IOException;
 import java.io.Serializable;
 import java.io.Writer;
@@ -43,7 +35,6 @@ import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
-
 import javax.servlet.ServletConfig;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
@@ -54,8 +45,9 @@ import javax.servlet.http.HttpSession;
 import javax.validation.Valid;
 import javax.validation.constraints.NotNull;
 
-import org.junit.Ignore;
+import static org.junit.Assert.*;
 import org.junit.Test;
+
 import org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator;
 import org.springframework.aop.interceptor.SimpleTraceInterceptor;
 import org.springframework.aop.support.DefaultPointcutAdvisor;
@@ -90,6 +82,7 @@ import org.springframework.util.SerializationTestUtils;
 import org.springframework.util.StringUtils;
 import org.springframework.validation.BindingResult;
 import org.springframework.validation.Errors;
+import org.springframework.validation.FieldError;
 import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
 import org.springframework.web.bind.WebDataBinder;
 import org.springframework.web.bind.annotation.CookieValue;
@@ -1303,6 +1296,9 @@ public class ServletAnnotationControllerTests {
 
 		@RequestMapping("/myPath.do")
 		public String myHandle(@ModelAttribute("myCommand") TestBean tb, BindingResult errors, ModelMap model) {
+			FieldError error = errors.getFieldError("age");
+			assertNotNull("Must have field error for age property", error);
+			assertEquals("value2", error.getRejectedValue());
 			if (!model.containsKey("myKey")) {
 				model.addAttribute("myKey", "myValue");
 			}