Update Jackson to version 2.10.1

[PascalSchumacher]

Jackson 2.10 was just released and will be used by Spring 5.2 and Spring Boot 2.2.

[PascalSchumacher]

I guess the change to HttpServiceTaskTest#testDeleteResponseEmptyBody is not correct. Probably the implementation has to be changed instead to keep the old behavior.

The reason for the behavior change should be one of the Null related changes listed in https://github.com/FasterXML/jackson/wiki/Jackson-Release-2.10 (maybe FasterXML/jackson-databind#2430).

[filiphr]

It probably is that. However, I think that we should fix it in the implementation side not in the test.

Perhaps in https://github.com/flowable/flowable-engine/blob/c0f05e8c682ded61035a5076ff66ad97524772aa/modules/flowable-http/src/main/java/org/flowable/http/HttpActivityExecutor.java#L118 and check if the return type is NullNode.

Or adapt JsonType

[PascalSchumacher]

Thanks Phillip!

I have updated the pull request and changed the implementation instead of the test (not sure if this is the best solution).

The correct Jacksons issue is Change of behavior (2.8 -> 2.9) with ObjectMapper.readTree(input) with no content, see: FasterXML/jackson-databind#2211

[tijsrademakers]

Thanks for the PR, merged the changes in a separate commit.