Build failing for Logstash 6.3.1


I'm attempting to build logstash into an RPM. The reason I'm doing this is because I want to include some additional input/output/filter plugins at build time, rather than install them later.
My ruby, rake, bundler & gradle skills are not up to scratch. I installed the version of JRUBY that the build was asking for (jruby- and have done the following commands:

./gradlew bootstrap
./gradlew build
org.logstash.instruments.monitors.MemoryMonitorTest > testEachHeapSpaceRepresented FAILED
  Expected: (a collection containing "PS Survivor Space" and a collection containing "PS Old Gen" and a collection containing "PS Eden Space")
     but: a collection containing "PS Survivor Space" was "Eden Space", was "Survivor Space", was "Tenured Gen"
    at org.hamcrest.MatcherAssert.assertThat(
    at org.hamcrest.MatcherAssert.assertThat(
    at org.logstash.instruments.monitors.MemoryMonitorTest.testEachHeapSpaceRepresented(

|  Results: FAILURE (508 tests, 507 successes, 1 failures, 0 skipped)  |

508 tests completed, 1 failed

I have no idea if it matters, but my system java is:
$ java -version
openjdk version "1.8.0_171"
OpenJDK Runtime Environment (build 1.8.0_171-b10)
OpenJDK 64-Bit Server VM (build 25.171-b10, mixed mode)

OS is Oracle LInux 7.5

Is anyone able to suggest why the build might be failing and how I could fix it?

Many thanks,
Nick George

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