Config tests fail with JDK-8

Attempting to build controller with jdk-8 results in a test failure:

Tests run: 3, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.285 sec <<< FAILURE! - in org.opendaylight.controller.config.yangjmxgenerator.ModuleMXBeanEntryTest
testThreadsJava(org.opendaylight.controller.config.yangjmxgenerator.ModuleMXBeanEntryTest) Time elapsed: 0.089 sec <<< FAILURE!
java.lang.AssertionError: expected:<4> but was:<1>
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:743)
at org.junit.Assert.assertEquals(Assert.java:118)
at org.junit.Assert.assertEquals(Assert.java:555)
at org.junit.Assert.assertEquals(Assert.java:542)
at org.opendaylight.controller.config.yangjmxgenerator.ModuleMXBeanEntryTest.testThreadsJava(ModuleMXBeanEntryTest.java:257)