Hang in ClassLoader Thread intermittently

"ClassLoader Thread" daemon prio=10 tid=0x00007f0b44281000 nid=0x5fa9 waiting on condition [0x00007f0b48197000]
   java.lang.Thread.State: RUNNABLE
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at org.jboss.modules.ModuleClassLoader.doDefineOrLoadClass(ModuleClassLoader.java:330)
	at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:411)
	at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:260)
	at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:73)
	at org.jboss.modules.Module.loadModuleClass(Module.java:500)
	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:182)
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:485)
	at org.jboss.modules.ConcurrentClassLoader.access$400(ConcurrentClassLoader.java:54)
	at org.jboss.modules.ConcurrentClassLoader$LoaderThread.run(ConcurrentClassLoader.java:656)
	- locked <0x00000000f9429ef8> (a org.jboss.modules.ModuleClassLoader)