The reason is IBMJDK doesn't contain jps.

See:
https://jenkins.mw.lab.eng.bos.redhat.com/hudson/job/wildfly-as-testsuite-RHEL-matrix-IBMJDK7/jdk=ibm17,label_exp=RHEL6%26%26x86_64/3/testReport/org.jboss.as.test.integration.respawn/RespawnTestCase/org_jboss_as_test_integration_respawn_RespawnTestCase/

Stacktrace

java.lang.AssertionError: JPS executable not found. File: /qa/hudson_workspace/workspace/wildfly-as-testsuite-RHEL-matrix-IBMJDK7/e8d3a83a/jdk/jre/../bin/jps
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.assertTrue(Assert.java:41)
at org.jboss.as.test.integration.respawn.RespawnTestCase$UnixProcessUtil.getJpsCommand(RespawnTestCase.java:700)
at org.jboss.as.test.integration.respawn.RespawnTestCase$ProcessUtil.listProcesses(RespawnTestCase.java:604)
at org.jboss.as.test.integration.respawn.RespawnTestCase$ProcessUtil.getInitialProcessIds(RespawnTestCase.java:570)
at org.jboss.as.test.integration.respawn.RespawnTestCase$ProcessUtil.<init>(RespawnTestCase.java:566)
at org.jboss.as.test.integration.respawn.RespawnTestCase$UnixProcessUtil.<init>(RespawnTestCase.java:691)
at org.jboss.as.test.integration.respawn.RespawnTestCase.createProcessController(RespawnTestCase.java:116)