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Deserialize from json #724

renemeuselwitz opened this Issue Oct 2, 2018 · 3 comments


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renemeuselwitz commented Oct 2, 2018


when serailizing and deserializing Diffs of objects, I'm having some trouble:

Let's assume the following:


   Item val1 = new Item();
    Item val2 = new Item();

    Javers javers = JaversBuilder.javers().build();
    Diff diff =, val2);

    String json = javers.getJsonConverter().toJson(diff); // until here it works

    Diff javersDiff = javers.getJsonConverter().fromJson(json , Diff.class); // here it crashes


I'm getting a "java.lang.IllegalArgumentException: argument should not be null" Exception. Debugging further into it gives me a
"Method threw 'java.lang.IllegalArgumentException' exception. Cannot evaluate org.javers.core.diff.Diff.toString()"

Any way to actually nicely deserialize my values again as Diff?



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renemeuselwitz commented Oct 2, 2018

PS: I am using version 3.11.5.

I also rolled back, and the code works like a charm for version.

Seems like it stopped working somewhen in version 3.8. Still works for my with old versions until 3.7.9


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bartoszwalacik commented Oct 2, 2018

@rene try to submit a PR with a fix, we will merge

bartoszwalacik added a commit that referenced this issue Oct 19, 2018

style fixes

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bartoszwalacik commented Oct 19, 2018

fix released in 3.12.1

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