Merge two java beans useful when discovering differences

Beanutils.java

class Beanutils{
//merge two bean by discovering differences 
private <M> void merge(M target, M destination) throws Exception {
		    BeanInfo beanInfo = Introspector.getBeanInfo(target.getClass());

		    // Iterate over all the attributes
		    for (PropertyDescriptor descriptor : beanInfo.getPropertyDescriptors()) {

		      // Only copy writable attributes
		      if (descriptor.getWriteMethod() != null) {
		        Object originalValue = descriptor.getReadMethod()
		        .invoke(target);

		        // Only copy values values where the destination values is null
		        if (originalValue == null) {
		          Object defaultValue = descriptor.getReadMethod().invoke(
		              destination);
		          descriptor.getWriteMethod().invoke(target, defaultValue);
		        }

		      }
		    }
		  }

}