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java.lang.NullPointerException: 	at com.google.appengine.api.ThreadManager.backgroundThreadFactory(ThreadManager.java:72)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.google.firebase.database.core.GaePlatform.getGaeThreadFactory(GaePlatform.java:62)	at com.google.firebase.database.core.GaePlatform.isActive(GaePlatform.java:78)	at com.google.firebase.database.core.Context.getPlatform(Context.java:42)	at com.google.firebase.database.core.Context.ensureLogger(Context.java:211)	at com.google.firebase.database.core.Context.initServices(Context.java:77)	at com.google.firebase.database.core.Context.freeze(Context.java:64)	at com.google.firebase.database.core.RepoManager.createLocalRepo(RepoManager.java:78)	at com.google.firebase.database.core.RepoManager.createRepo(RepoManager.java:28)	at com.google.firebase.database.FirebaseDatabase.ensureRepo(FirebaseDatabase.java:249)	at com.google.firebase.database.FirebaseDatabase.getReference(FirebaseDatabase.java:114)	at com.basetis.appengine.utils.FirebaseUtils.initializeApp(FirebaseUtils.java:15)	at integration.TestIntegration.beforeAllTests(TestIntegration.java:32)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)