Couldn't find a differ for type: [Ljava.lang.annotation.Annotation

[jepsar]

at de.danielbechler.diff.differ.DifferProvider.retrieveDifferForType(DifferProvider.java:47)

using 0.92.1

[SQiShER]

You're trying to diff an array of annotations. Arrays are currently not supported. Some related issues are #3, #120, #104 and #42. As you can see, this is a strongly requested feature, but also a pretty complex one. It is currently being worked on on this branch, but I can't tell you when it'll be done.

However, you have some options:

• If you don't care about the property that's causing the error, you can just exclude it from comparison
• If you care about it, you can implement your own custom differ that is tailored to your needs
• If you have control over the type, just change the Array into a Set (I know, usually that's not an option, but I still wanted to mention it)

Depending on the option you choose, I can give you more pointers.

[jepsar]

The Annotation array is part of a JPA class which I have as a member of a plain Java object. For now I totally ignore the JPA class, since I've read all information from the annotations.

Cheers!

[SQiShER]

👍

[celiovasconcelos]

@jepsar How do you ignore JPA classes? I can't do that.

[celiovasconcelos]

@jepsar I did this. It's now working for JPA/Hibernate object tree

ObjectDifferBuilder objectDifferBuilder = ObjectDifferBuilder.startBuilding();
objectDifferBuilder.differs().register(new DifferFactory() {
    @Override
    public Differ createDiffer(DifferDispatcher differDispatcher, NodeQueryService nodeQueryService) {
        return new Differ() {
            @Override
            public DiffNode compare(DiffNode parentNode, Instances instances) {
                return new DiffNode(parentNode, instances.getSourceAccessor());
            }

            @Override
            public boolean accepts(Class<?> type) {
                return type.isArray() || type.getPackage().getName().contains("org.hibernate");
            }
        };
    }
});
ObjectDiffer objectDiffer = objectDifferBuilder.build();

[jepsar]

I used a ObjectDifferBuilder.startBuilding().inclusion().include() and then only included the properties I needed to check.