Compare objects containing map using Javers

Question

When I really wanted to compare two objects easily, I found a library called Javers. This does pretty good job for the most cases, such as comparing value changes in the objects and also works well for lists. But if a have two objects which contain a map then how will capture the changes? For example I have a following class with a map,

public class Test {
   private Map<String,Object> map = new HashMap();
   //some others fields
   //getters and setters
}

Now, if I have objects of this with the below values:

Test test1 = new Test();
Map<String,Object> map1 = new HashMap();
map1.put("one",1);
map1.put("two",2);
test1.setMap(map1);
Test test2 = new Test();
Map<String,Object> map2 = new HashMap();
map2.put("one",2);
map2.put("two",1);
test2.setMap(map2);
Javers javers = JaversBuilder.javers().build();
javers.compare(test1,test2);//?

This doesn't give me the changes done in map. How will I capture it?

Answer 1

To capture the changes you need to process the diff object returned by the compare method. For example to just print the changes:

Diff diff = javers.compare(test1,test2);
        diff.getChanges().forEach(change -> System.out.println(change.toString()));

More info can be found in the documentation of javers: http://javers.org/documentation/diff-examples/

And in the javadoc: http://javers.org/javadoc_3.x/org/javers/core/diff/Diff.html