Is there a Java library that can “diff” two Objects?

Question

Is there a Java utility library that is analogous to the Unix program diff, but for Objects? I\'m looking for something that can compare two objects of the same type and ge

Answer 1

Might be a little late, but I was in the same situation like you and ended up creating my own library for exactly your use-case. Since I was forced to come up with a solution myself, I decided to release it on Github, to spare others the hard work. You can find it here: https://github.com/SQiShER/java-object-diff

--- Edit ---

Here is a little usage example based on the OPs code:

SomeClass a = new SomeClass();
SomeClass b = new SomeClass();

a.setProp1("A");
a.setProp2("X");

b.setProp1("B");
b.setProp2("X");

DiffNode diff = ObjectDifferBuilder.buildDefault().compare(a, b);

assert diff.hasChanges();
assert diff.childCount() == 1;
assert diff.getChild('prop1').getState() == DiffNode.State.CHANGED;