public class TestProcessEndHook extends ProcessEndHookAdapter { 
	
	@Override
	public boolean processEnd(ObjectContext objectContext,
			String processId, String serviceId) {
		return StringUtils.equalsIgnoreCase("testhook",objectContext.getObjectType()) // this component will only be executed if the object type is testhook
				&& StringUtils.equalsIgnoreCase(ProcessID.STATUS_CHANGE,processId); // this component will only be executed for the "status_change" process
	}
	
	@Override
	public void processEnd(ProcessEndContext context) {
		
		Collection<ProcessObject> modified = context.getModifiedObjects(); // list of objects modified during the process
		Collection<ProcessObjectReject> rejected = context.getRejectedObjects(); // list of objects rejected during the process
		Map<String,String> additionalParameters = context.getAdditionalParameters();
		System.out.println("additional parameters: " + additionalParameters); // displays additional parameters (here, the action identifier passed to the service)
		for(ProcessObject object : context.getObjects()) { // iterate over all processed objects
			ObjectReference ref = object.getObjectReference();
			System.out.print(ref.getType()+"/"+ref.getId()); // displays UID of object
			if ( modified.contains(object) ) { // if the objet is modified...
				System.out.println(" modified "); // prints "modified"
				
				System.out.println("modified properties " + object.getModifiedProperties()); // then prints modified properties (i.e. status)
				System.out.println("old object: " + object.getOldObject()); // then prints the old instance
				System.out.println("new object: " + object.getNewObject()); // then prints the new instance
				for(String property : object.getModifiedProperties()) { // for each modified property
					System.out.print( property  );
					System.out.print( " "  );
					try {
						System.out.print( object.getOldObject().getProperty(property) ); // prints old value
					} catch (Throwable e) {
						System.out.print( e );
					}
					System.out.print( " => "  );
					try {
						System.out.print( object.getNewObject().getProperty(property) ); // prints new value
					} catch (Throwable e) {
						System.out.print( e );
					}
					System.out.println();
				}
				
			}
			else if ( rejected.contains(object) ) { // if object is rejected
				System.out.print(" rejected "); // prints "rejected"
				ProcessObjectReject rejection = (ProcessObjectReject) object;
				String error = rejection.getError(); // then prints error if any
				if ( error==null ) { 
					
					Throwable t = rejection.getThrowable();
					if ( t!=null ) {
						error = t.getMessage();
					}
					if ( error==null ) {
						error = "Unknown error";
					}
				}
				System.out.print(" error= ");
				System.out.println(error);
			}
			else {
				System.out.println(" not modified "); // if object is neither modified nor rejected, prints "not modified"
			}
			
		}
		
		System.out.println("type: " + context.getObjectType()); 
		System.out.println("types: " + context.getObjectTypes()); 
		System.out.println("surfer: " + context.getSurfer());
		
	}

}

additional parameters: {action=activate}
testhook/1 not modified 
testhook/42 rejected  error= Object not found 42 for action DAM/testhook
testhook/2 modified 
modified properties [status]
old object: testhook/2
new object: testhook/2
status 2 => 6
type: testhook
types: [testhook]
surfer: CTSurfer { connected:true , uid: user_42, id: 42, name: Jane Smith, roleId: 37, role: Contributor }