The test LoadSelectedColumnsCollectionTest fails randomly on JDK 7 with the following exception:

java.lang.NullPointerException
at org.hibernate.ogm.test.mongodb.loading.LoadSelectedColumnsCollectionTest.getService(LoadSelectedColumnsCollectionTest.java:154)
at org.hibernate.ogm.test.mongodb.loading.LoadSelectedColumnsCollectionTest.testLoadSelectedColumns(LoadSelectedColumnsCollectionTest.java:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at junit.framework.TestCase.runTest(TestCase.java:168)
at org.hibernate.ogm.test.simpleentity.OgmTestCase.runTest(OgmTestCase.java:197)
at org.hibernate.ogm.test.simpleentity.OgmTestCase.runBare(OgmTestCase.java:243)

This happens when the second test method in the file is executed before the first one. This can happen as of Java 7 since the order of methods retrieved via reflection is not deterministic any more. In this case the session factory will have been nulled by the tearDown() call after the from the second test method, causing the NPE when running the first test method afterwards.