[Travis] Replace JDK 9/10 with 14

[TimvdLippe]

9/10 are EOL since September 2018. 14 is the currently supported
Java version.

[mockitoguy]

The build is failing however I'm +1 to the goals of this PR. Thx!

[TimvdLippe]

Yeah I am working on resolving the build issue. We need to upgrade our Gradle version. Sadly that turns out to be a whole rabbithole, but I think I am close.

[epeee]

@TimvdLippe it looks like we also have to use errorprone 2.4.0 since this is the first version which actually supports java 14.

Task :compileJava
/home/travis/build/mockito/mockito/src/main/java/org/mockito/invocation/InvocationOnMock.java:57: error: An unhandled exception was thrown by the Error Prone static analysis plugin.
T getArgument(int index);
^
Please report this at https://github.com/google/error-prone/issues/new and include the following:
error-prone version: 2.3.2
BugPattern: TypeParameterUnusedInFormals
Stack Trace:
java.lang.NoSuchFieldError: bound
at com.google.errorprone.bugpatterns.TypeParameterUnusedInFormals.matchMethod(TypeParameterUnusedInFormals.java:73)
at com.google.errorprone.scanner.ErrorProneScanner.visitMethod(ErrorProneScanner.java:890)

[TimvdLippe]

@epeee Yes indeed. Were you able to get Gradle working on your machine?!

[epeee]

yes. Furthermore, also the latest travis build (https://travis-ci.org/github/mockito/mockito/jobs/698954197) is failing with the message posted previously.

[TimvdLippe]

Interesting, because I was looking at https://travis-ci.org/github/mockito/mockito/jobs/698954215 which is failing for a completely different reason :O

[TimvdLippe]

I wonder maybe if the build cache is not working on one job, but is working on the other. Not sure how to diagnose this issue though.

[TimvdLippe]

Oh, on the push Travis build, both tasks failed on the ErrorProne issue, but not the Gradle compilation issue. So out of 3 tasks, only the 1 on the PR build is failing.

[codecov-commenter]

Codecov Report

Merging #1945 into release/3.x will decrease coverage by 0.55%.
The diff coverage is 83.47%.

@@                Coverage Diff                @@
##             release/3.x    #1945      +/-   ##
=================================================
- Coverage          86.76%   86.21%   -0.56%     
- Complexity          2494     2542      +48     
=================================================
  Files                311      318       +7     
  Lines               6552     6738     +186     
  Branches             821      838      +17     
=================================================
+ Hits                5685     5809     +124     
- Misses               670      715      +45     
- Partials             197      214      +17     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/org/mockito/AdditionalAnswers.java	95.00% <ø> (ø)	19.00 <0.00> (ø)
src/main/java/org/mockito/Answers.java	91.66% <ø> (ø)	3.00 <0.00> (ø)
src/main/java/org/mockito/ArgumentMatchers.java	99.08% <ø> (ø)	59.00 <0.00> (ø)
src/main/java/org/mockito/BDDMockito.java	88.23% <ø> (ø)	10.00 <0.00> (ø)
src/main/java/org/mockito/Matchers.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
src/main/java/org/mockito/Mockito.java	96.77% <ø> (ø)	42.00 <0.00> (ø)
...ito/exceptions/base/MockitoSerializationIssue.java	100.00% <ø> (ø)	3.00 <0.00> (ø)
...eptions/misusing/UnnecessaryStubbingException.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...ain/java/org/mockito/hamcrest/MockitoHamcrest.java	85.71% <ø> (ø)	9.00 <0.00> (ø)
...rc/main/java/org/mockito/internal/InOrderImpl.java	100.00% <ø> (ø)	10.00 <0.00> (ø)
... and 184 more

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[TimvdLippe]

I purged the corrupt Travis cache and was able to get a passing build. See gradle/gradle#13444 (comment) for more info.