So far, I have seen a couple of tests failing with the following stack trace:

java.lang.NoClassDefFoundError: com/beust/jcommander/ParameterException
at com.sun.javatest.regtest.TestNGAction$TestNGRunner.main(TestNGAction.java:214)
at com.sun.javatest.regtest.TestNGAction$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$MainThread.run(MainWrapper.java:110)
at java.lang.Thread.run(java.base@9-internal/Thread.java:843)
Caused by: java.lang.ClassNotFoundException: com.beust.jcommander.ParameterException
at jdk.internal.loader.BuiltinClassLoader.loadClass(java.base@9-internal/BuiltinClassLoader.java:366)
at jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(java.base@9-internal/ClassLoaders.java:185)
at java.lang.ClassLoader.loadClass(java.base@9-internal/ClassLoader.java:419)
... 8 more

The tests that are failing are:
1. jdk/test/java/JTwork/java/security/AccessController/LimitedDoPrivilegedWithNullPerms.java
2. jdk/test/java/JTwork/java/security/Provider/SecurityProviderModularTest.java