This is an intermittent failure that occurred on my machine while running 'make jdk_jmx':

----------System.err:(30/1614)----------
java.lang.reflect.InvocationTargetException
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:484)
at LeakTest.testShadow(LeakTest.java:111)
at LeakTest.test(LeakTest.java:84)
at LeakTest.main(LeakTest.java:71)
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:484)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NoClassDefFoundError: MerlinMXBean
at RandomMXBeanTest.main(RandomMXBeanTest.java:136)
... 13 more
Caused by: java.lang.ClassNotFoundException: MerlinMXBean
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:426)
at java.lang.ClassLoader.loadClass(ClassLoader.java:359)
... 14 more

It appears that javax/management/mxbean/LeakTest.java has an @build tag that says:

 * @run build LeakTest RandomMXBeanTest

However RandomMXBeanTest depends on two other classes: MerlinMXBean and TigerMXBean.
These two classes should probably be added to the @run build line:

 * @run build LeakTest RandomMXBeanTest MerlinMXBean TigerMXBean