jdk9 VM PIT. The failures seen only once on windows.

Running: [C:\\local\\aurora\\CommonData\\TEST_JAVA_HOME\\bin\\java.exe, -mp, partialUpdateFooNotAllFiles, -m, foo/jdk.test.foo.Foo]
test Basic.partialUpdateFooNotAllFiles(): success
Running: [C:\\local\\aurora\\CommonData\\TEST_JAVA_HOME\\bin\\jar.exe, --create, --file=partialUpdateFooVersion\\foo.jar, --module-version=100000000, --no-manifest, -C, C:\\local\\aurora\\sandbox\\results\\workDir\\classes\\1\\tools\\jar\\modularJar\\build\\foo, .]
Running: [C:\\local\\aurora\\CommonData\\TEST_JAVA_HOME\\bin\\jar.exe, --update, --file=partialUpdateFooVersion\\foo.jar, --main-class=jdk.test.foo.Foo, --module-version=1.123, --no-manifest]
test Basic.partialUpdateFooVersion(): failure
java.lang.AssertionError: Expected ec 0, got: 1 , output [java.io.IOException: Error in writing existing jar file
at sun.tools.jar.Main.run(jdk.jartool@9-internal/Main.java:379)
at sun.tools.jar.Main.main(jdk.jartool@9-internal/Main.java:1578)
] expected [true] but found [false]
at org.testng.Assert.fail(Assert.java:94)
at org.testng.Assert.failNotEquals(Assert.java:494)
at org.testng.Assert.assertTrue(Assert.java:42)
at Basic.assertTrue(Basic.java:944)
at Basic$Result.assertSuccess(Basic.java:928)
at Basic.partialUpdateFooVersion(Basic.java:360)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-internal/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@9-internal/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-internal/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@9-internal/Method.java:531)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
at org.testng.TestNG.run(TestNG.java:1057)
at com.sun.javatest.regtest.TestNGAction$TestNGRunner.main(TestNGAction.java:220)
at com.sun.javatest.regtest.TestNGAction$TestNGRunner.main(TestNGAction.java:184)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-internal/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@9-internal/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-internal/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@9-internal/Method.java:531)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
at java.lang.Thread.run(java.base@9-internal/Thread.java:843)