SPR-5732 - When no type conversion strategy is found on a @Controller handler method bind target, a 500 error code should be returned not a 400.

org.springframework.beans/src/main/java/org/springframework/beans/BeanWrapperImpl.java

@@ -355,6 +355,8 @@ public class BeanWrapperImpl extends AbstractPropertyAccessor implements BeanWra
 		}
 		catch (IllegalArgumentException ex) {
 			throw new TypeMismatchException(value, requiredType, ex);
+		} catch (IllegalStateException ex) {
+			throw new ConversionNotSupportedException(value, requiredType, ex);
 		}
 	}
 
@@ -382,6 +384,11 @@ public class BeanWrapperImpl extends AbstractPropertyAccessor implements BeanWra
 					new PropertyChangeEvent(this.rootObject, this.nestedPath + propertyName, null, value);
 			throw new TypeMismatchException(pce, pd.getPropertyType(), ex);
 		}
+		catch (IllegalStateException ex) {
+			PropertyChangeEvent pce =
+					new PropertyChangeEvent(this.rootObject, this.nestedPath + propertyName, null, value);
+			throw new ConversionNotSupportedException(pce, pd.getPropertyType(), ex);
+		}
 	}
 
 
@@ -840,6 +847,11 @@ public class BeanWrapperImpl extends AbstractPropertyAccessor implements BeanWra
 						new PropertyChangeEvent(this.rootObject, this.nestedPath + propertyName, oldValue, pv.getValue());
 				throw new TypeMismatchException(pce, pd.getPropertyType(), ex);
 			}
+			catch (IllegalStateException ex) {
+				PropertyChangeEvent pce =
+						new PropertyChangeEvent(this.rootObject, this.nestedPath + propertyName, oldValue, pv.getValue());
+				throw new ConversionNotSupportedException(pce, pd.getPropertyType(), ex);
+			}
 			catch (IllegalAccessException ex) {
 				PropertyChangeEvent pce =
 						new PropertyChangeEvent(this.rootObject, this.nestedPath + propertyName, oldValue, pv.getValue());

org.springframework.beans/src/main/java/org/springframework/beans/ConversionNotSupportedException.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2002-2009 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.beans;
+
+import java.beans.PropertyChangeEvent;
+
+/**
+ * Exception thrown when no suitable editor can be found to set a bean property.
+ *
+ * @author Arjen Poutsma
+ * @since 3.0
+ */
+public class ConversionNotSupportedException extends TypeMismatchException {
+
+	public ConversionNotSupportedException(PropertyChangeEvent propertyChangeEvent, Class requiredType) {
+		super(propertyChangeEvent, requiredType);
+	}
+
+	public ConversionNotSupportedException(PropertyChangeEvent propertyChangeEvent, Class requiredType, Throwable cause) {
+		super(propertyChangeEvent, requiredType, cause);
+	}
+
+	public ConversionNotSupportedException(Object value, Class requiredType) {
+		super(value, requiredType);
+	}
+
+	public ConversionNotSupportedException(Object value, Class requiredType, Throwable cause) {
+		super(value, requiredType, cause);
+	}
+}

org.springframework.beans/src/main/java/org/springframework/beans/DirectFieldAccessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2009 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -124,6 +124,10 @@ public class DirectFieldAccessor extends AbstractPropertyAccessor {
 			PropertyChangeEvent pce = new PropertyChangeEvent(this.target, propertyName, oldValue, newValue);
 			throw new TypeMismatchException(pce, field.getType(), ex);
 		}
+		catch (IllegalStateException ex) {
+			PropertyChangeEvent pce = new PropertyChangeEvent(this.target, propertyName, oldValue, newValue);
+			throw new ConversionNotSupportedException(pce, field.getType(), ex);
+		}
 	}
 
 	public Object convertIfNecessary(
@@ -134,6 +138,9 @@ public class DirectFieldAccessor extends AbstractPropertyAccessor {
 		catch (IllegalArgumentException ex) {
 			throw new TypeMismatchException(value, requiredType, ex);
 		}
+		catch (IllegalStateException ex) {
+			throw new ConversionNotSupportedException(value, requiredType, ex);
+		}
 	}
 
 }

org.springframework.beans/src/main/java/org/springframework/beans/SimpleTypeConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2006 the original author or authors.
+ * Copyright 2002-2009 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -49,6 +49,9 @@ public class SimpleTypeConverter extends PropertyEditorRegistrySupport implement
 		catch (IllegalArgumentException ex) {
 			throw new TypeMismatchException(value, requiredType, ex);
 		}
+		catch (IllegalStateException ex) {
+			throw new ConversionNotSupportedException(value, requiredType, ex);
+		}
 	}
 
 }

org.springframework.beans/src/main/java/org/springframework/beans/TypeConverterDelegate.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2009 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -209,7 +209,7 @@ class TypeConverterDelegate {
 			}
 
 			if (!ClassUtils.isAssignableValue(requiredType, convertedValue)) {
-				// Definitely doesn't match: throw IllegalArgumentException.
+				// Definitely doesn't match: throw IllegalArgumentException/IllegalStateException
 				StringBuilder msg = new StringBuilder();
 				msg.append("Cannot convert value of type [").append(ClassUtils.getDescriptiveType(newValue));
 				msg.append("] to required type [").append(ClassUtils.getQualifiedName(requiredType)).append("]");
@@ -219,11 +219,12 @@ class TypeConverterDelegate {
 				if (editor != null) {
 					msg.append(": PropertyEditor [").append(editor.getClass().getName()).append(
 							"] returned inappropriate value");
+					throw new IllegalArgumentException(msg.toString());
 				}
 				else {
 					msg.append(": no matching editors or conversion strategy found");
+					throw new IllegalStateException(msg.toString());
 				}
-				throw new IllegalArgumentException(msg.toString());
 			}
 		}