Add jdk11 compat tests for Blackbird cross-classloader access

[stevenschlansker]

This test fails until the issue is fixed in Blackbird.
FasterXML/jackson-modules-base#138
FasterXML/jackson-modules-base#162

Note: I am currently not able to complete a Maven build of this project, even before changing anything I end up with:

[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ jdk11-tests ---
[INFO] Toolchain in maven-compiler-plugin: JDK[/usr/lib/jvm/java-11]
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for Jackson-JDK11-compat-test 2.12.0-rc2:
[INFO] 
[INFO] Jackson-JDK11-compat-test .......................... SUCCESS [  1.096 s]
[INFO] jdk11-tests ........................................ FAILURE [  0.336 s]
[INFO] jackson-jlink ...................................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project jdk11-tests: Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile failed: Unsupported major.minor version 61.0 -> [Help 1]

Are you able to build?

[GedMarc]

I do have a fairly big update coming in for JDK 17 support as well - the version and release of the jakarta artifacts to official distributions being one (resolving the build issue)

I'll bump this up a bit to get it in quicker for you - Also check your jackson version there, 2.12.0-rc2 ;)

THANKS FOR THE PR!!!!

[stevenschlansker]

Thanks @GedMarc, that sounds great! Yes, 2.12.0-rc2 does seem wrong, but that is not my change. it is that way on master branch: https://github.com/FasterXML/jackson-jdk11-compat-test/blob/master/pom.xml#L13

[GedMarc]

yeah i know :'( i've really let this one slip

[cowtowncoder]

We probably also need to start using maintenance branches etc. Will merge this first tho.

[cowtowncoder]

Ok I changed versions to 2.13.2-SNAPSHOT but I think there's now one 2.12 vs 2.13 issue -- latter moved away from jakarta classifier for JAX-vs-Jakarta difference. So that needs to be resolved somehow.