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    Check if the version of resteasy is using is the same JBoss is using. To find it out, search for resteasy-jaxrs* in JBoss/Wildfly directory and at your pom.xml.

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java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.WebSocketFactory$Acceptor from [Module "deployment.OAuthPopupTest-1.0-SNAPSHOT.war:main" from Service Module Loader]	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:213)	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:459)	at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:408)	at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:389)	at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:134)