java.util.UUID error

INFO: Illegal access: this web application instance has been stopped already. Could not load [java.util.UUID]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [java.util.UUID]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1328)
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1316)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1181)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1142)
    at rocks.xmpp.core.stanza.model.IQ.<init>(IQ.java:142)
    at rocks.xmpp.core.stanza.model.IQ.<init>(IQ.java:127)
    at rocks.xmpp.core.stanza.model.IQ.<init>(IQ.java:115)
    at rocks.xmpp.core.stanza.model.IQ.get(IQ.java:154)
    at rocks.xmpp.extensions.ping.PingManager.ping(PingManager.java:136)
    at rocks.xmpp.extensions.ping.PingManager.pingServer(PingManager.java:161)
    at rocks.xmpp.extensions.ping.PingManager.lambda$rescheduleNextPing$5(PingManager.java:191)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
openjdk version "1.8.0_111" OpenJDK Runtime Environment (build 1.8.0_111-8u111-b14-2~bpo8+1-b14) OpenJDK 64-Bit Server VM (build 25.111-b14, mixed mode)
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