ReflectionUtils.doWithFields()

Spring has a nice Utility class ReflectionUtils that does just that: it defines a method to loop over all fields of all super classes with a callback: ReflectionUtils.doWithFields()

Documentation:

Invoke the given callback on all fields in the target class, going up the class hierarchy to get all declared fields.

Parameters:
- clazz - the target class to analyze

- fc - the callback to invoke for each field

- ff - the filter that determines the fields to apply the callback to

Sample Code:

	ReflectionUtils.doWithFields(RoleUnresolvedList.class,
	new FieldCallback(){
	@Override
	public void doWith(final Field field) throws IllegalArgumentException,
	IllegalAccessException{
	System.out.println("Found field " + field + " in type "
	+ field.getDeclaringClass());
	}
	},
	new FieldFilter(){
	@Override
	public boolean matches(final Field field){
	final int modifiers = field.getModifiers();
	// no static fields please
	return !Modifier.isStatic(modifiers);
	}
	});

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Output:

Found field private int java.util.ArrayList.size in type class java.util.ArrayList