A big number of tests failed in the Thursday Hotspot nightly with this error. The only new changes in the Thursday nightly came with the jdk9/dev integration. This included the latest Jigsaw update.

[2016-12-09T02:32:14.47] nsk.share.TestFailure: Test caught an exception: java.lang.NullPointerException
[2016-12-09T02:32:14.47] at nsk.share.Log.logExceptionForAurora(Log.java:411)
[2016-12-09T02:32:14.47] at nsk.share.Log.complain(Log.java:380)
[2016-12-09T02:32:14.47] at nsk.share.Log.complain(Log.java:391)
[2016-12-09T02:32:14.47] at vm.mlvm.share.Env.complain(Env.java:150)
[2016-12-09T02:32:14.47] at vm.mlvm.share.MlvmTestExecutor.launch(MlvmTestExecutor.java:224)
[2016-12-09T02:32:14.47] at vm.mlvm.share.MlvmTestExecutor.launch(MlvmTestExecutor.java:164)
[2016-12-09T02:32:14.47] at vm.mlvm.share.MlvmTestExecutor.launch(MlvmTestExecutor.java:135)
[2016-12-09T02:32:14.47] at vm.mlvm.share.MlvmTestExecutor.launch(MlvmTestExecutor.java:111)
[2016-12-09T02:32:14.47] at vm.mlvm.anonloader.stress.oome.heap.Test.main(Test.java:48)