java.lang.NoClassDefFoundError: This exception has no message.

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java.lang.NoClassDefFoundError:
at com.sun.identity.agents.realm.AmRealm.initializeAmRealm(Unknown Source)
at com.sun.identity.agents.realm.AmRealm.(Unknown Source)
at com.sun.identity.agents.realm.AmRealmManager.(Unknown Source)
at com.sun.identity.agents.realm.AmRealmManager.(Unknown Source)
at com.sun.identity.agents.as81.AmAS81J2EEAuthHandler.getModuleDebug(Unknown Source)
at com.sun.identity.agents.as81.AmAS81J2EEAuthHandler.authenticate(Unknown Source)
at com.sun.identity.agents.filter.AmFilter.doLocalAuthWithSessionBinding(Unknown Source)
at com.sun.identity.agents.filter.AmFilter.doLocalAuth(Unknown Source)
at com.sun.identity.agents.filter.AmFilter.isAccessAllowed(Unknown Source)
at com.sun.identity.agents.filter.AmAgentFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:161)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:263)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)
at com.sun.enterprise.web.connector.httpservice.HttpServiceProcessor.process(HttpServiceProcessor.java:221)
at com.sun.enterprise.web.HttpServiceWebContainer.service(HttpServiceWebContainer.java:2072)

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