This was found using jvm+os certification matrix on Jenkins:
https://jenkins.mw.lab.eng.bos.redhat.com/hudson/view/BxMS/view/BxMS-6.0/view/jBPM/view/all/job/bpms-jbpm-community-os-jvm-matrix/jdk=ibm17,label_exp=RHEL6/lastCompletedBuild/testReport/org.kie.services.client.api/RemoteApiTest/notAceptedMethodTest/

org.kie.services.client.api.RemoteApiTest.notAceptedMethodTest

Stacktrace

org.junit.ComparisonFailure: expected:<The .[registerWorkItemHandler](..) method is not s...> but was:<The .[execute](..) method is not s...>
at org.junit.Assert.assertEquals(Assert.java:115)
at org.junit.Assert.assertEquals(Assert.java:144)
at org.kie.services.client.api.RemoteApiTest.notAceptedMethodTest(RemoteApiTest.java:32)

It was reproduced afterwards also on Jenkins slave:
cd droolsjbpm-integration
git checkout 6.0.x
cd kie-remote/kie-services-client
export JAVA_HOME=/qa/tools/opt/ibm-java-70.1
/qa/tools/opt/maven3-latest/bin/mvn clean test -Dtest=org.kie.services.client.api.RemoteApiTest

This issue doesn't appear on other JVMs nor IBM Java 6.

Expected behavior:
All community unit tests work well on all supported platforms.

Env:
BPMS 6.0.2.ER3
RHEL 6
IBM Java 7