The javax/management/mxbean/MXBeanLoadingTest1.java test assumes that the application classloader will be a ClassLoader. This is not the case in the jigsaw/jake forest.

STDOUT:
MXBeanLoadingTest1::run: Start
We ensure no reference is retained on MXBean class after it is unregistered. We take time to perform some little extra check of Descriptors, MBean*Info.
(ERROR) Test's class loader is not a URLClassLoader
java.lang.RuntimeException: (ERROR) Test's class loader is not a URLClassLoader
at MXBeanLoadingTest1.run(MXBeanLoadingTest1.java:78)
at MXBeanLoadingTest1.main(MXBeanLoadingTest1.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-internal/Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(java.base@9-internal/NativeMethodAccessorImpl.java:62)
at sun.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$MainThread.run(MainWrapper.java:110)
at java.lang.Thread.run(java.base@9-internal/Thread.java:804)
 class java.lang.RuntimeException==>(ERROR) Test's class loader is not a URLClassLoader
STDERR:
java.lang.RuntimeException: java.lang.RuntimeException: (ERROR) Test's class loader is not a URLClassLoader
at MXBeanLoadingTest1.run(MXBeanLoadingTest1.java:289)
at MXBeanLoadingTest1.main(MXBeanLoadingTest1.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-internal/Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(java.base@9-internal/NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-internal/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@9-internal/Method.java:531)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
at java.lang.Thread.run(java.base@9-internal/Thread.java:804)
Caused by: java.lang.RuntimeException: (ERROR) Test's class loader is not a URLClassLoader
at MXBeanLoadingTest1.run(MXBeanLoadingTest1.java:78)
... 7 more

JavaTest Message: Test threw exception: java.lang.RuntimeException: java.lang.RuntimeException: (ERROR) Test's class loader is not a URLClassLoader
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: java.lang.RuntimeException: (ERROR) Test's class loader is not a URLClassLoader