Try running on java-ea for travis builds.

[FSchumacher]

Description

Enable builds for Java EA on travis ci

Motivation and Context

We should get early warnings, when JMeter doesn't run on EA versions of Java.

How Has This Been Tested?

Will get tested by travis :)

Screenshots (if appropriate):

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.

[pmouawad]

+1

[codecov-io]

Codecov Report

Merging #438 into trunk will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              trunk     #438   +/-   ##
=========================================
  Coverage     58.57%   58.57%           
+ Complexity    10776    10775    -1     
=========================================
  Files          1206     1206           
  Lines         77193    77193           
  Branches       7456     7456           
=========================================
  Hits          45213    45213           
+ Misses        29452    29451    -1     
- Partials       2528     2529    +1

Impacted Files	Coverage Δ	Complexity Δ
...s/org/apache/jmeter/timers/PoissonRandomTimer.java	72.97% <0%> (-5.41%)	9% <0%> (-1%)
...ocol/jms/org/apache/jmeter/protocol/jms/Utils.java	56.98% <0%> (+2.15%)	15% <0%> (ø)	⬇️

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[pmouawad]

Hi Felix,
Since you're working on this.
I see that when when we use openjdk11, we have those warnings:

warning: [options] bootstrap class path not set in conjunction with -source 8

Shouldn't we set source and target to 11 ?
Regards

[FSchumacher]

Hi Felix,
Since you're working on this.
I see that when when we use openjdk11, we have those warnings:

warning: [options] bootstrap class path not set in conjunction with -source 8

Shouldn't we set source and target to 11 ?
Regards

Well, as long as we are on Java 8 as minimum version, we should compile with something, that is compatible. That probably means:

• set the bootstrap class to a JDK from version 8 as shown on https://ant.apache.org/manual/Tasks/javac.html#bootstrap
• use a JDK 8 to compile and run the the tests with newer versions

But for this PR I am happy to have included the EA builds (even if they are failing right now)