Adds test that asserts that Static @JsonCreator method does work - refs #229

[mbknor]

This PR adds a test that shows that #229 does not work

[nbauernfeind]

Thanks for providing a test. I will look at this within the week.

[nbauernfeind]

This is an unused import - please remove.

[nbauernfeind]

The good news is that this test passes in my 2.7.2 branch. The bad news is that I have no idea how quickly we'll be able to get it released =). If you update your PR (per my simple comment) we can merge the test in to prevent regressions.

[nbauernfeind]

I suppose I can try and see if I can find the issue for earlier versions of jackson as well. Do you know which version of jackson you're using?

[mbknor]

Unused import is removed in PR.

The test case in PR is using version 2.6.3, but we have seen this problem for 2.6.x

[nbauernfeind]

This particular test seems to work for 2.6.0-1, 2.6.1, 2.6.2, 2.6.3, and the 2.6.4 snapshot. I have no doubt that there is an issue preventing dropwizard from working properly (per #229), but it must need more than this to trigger. I'll merge the test in and look into the other issue from another angle.

[mbknor]

After you said that the test-case worked for all 2.6.x versions, I did some more testing:

Looks like everything works fine as longe as you are using Java 1.6.

If the Java-class using the @JsonCreator is compiled using Java 1.8, the test case breaks.

This is how I can reproduce the issue using 1.6.3:

On command-line, prepare for using Java 1.6
start SBT and run CLEAN and TEST and see that everything works OK.
Then in intelliJ, where I have imported the same SBT projbect - BUT is using Java 1.8:
If you run the CreatorTest now, it works fine - because it is using the Java 1.6 compiled code.

Then add a line to the ValueHolder-class, then make the project so that only that file is recompiled.

If you now re-run the CreatorTest-test (which is still compiled using Java 1.6 with the rest of the module), then you will see that the test fails.

[nbauernfeind]

Excellent, thanks for being patient and explaining how to reproduce it.