EAP 7.4 jboss-client.jar throws NoClassDefFoundError

Solution Verified - Updated

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 7.4 Update 8
    • 7.4 Update 7

Issue

With EAP 7.4.7 the contained jboss-client.jar now throws a NoClassDefFoundError when a remote EJB is called.
It is my understanding the jboss-client.jar should be a complete in itself fat jar for an EJB client that does not require further dependencies.
Our reproducer generates the following Stacktrace:

.. ..
INFO: JBoss EJB Client version 4.0.45.Final-redhat-00001
Exception in thread "main" java.lang.NoClassDefFoundError: org/jboss/modules/ModuleLoadException
        at org.jboss.ejb.client.EJBClientContext.getDefault(EJBClientContext.java:110)
        at org.wildfly.common.context.ContextManager.getPrivileged(ContextManager.java:286)
        at org.jboss.ejb.client.EJBClientContext.getCurrent(EJBClientContext.java:861)
        at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:165)
        at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:116)
        at com.sun.proxy.$Proxy3.sayHello(Unknown Source)
        at test.EJBClient.main(EJBClient.java:22)
Caused by: java.lang.ClassNotFoundException: org.jboss.modules.ModuleLoadException
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
        ... 7 more
.. ..

Resolution

Apply EAP 7.4 Update 9+

As a workaround for JBoss EAP 7.4 Update 7 / Update 8, add jboss-modules.jar copied from JBOSS_EAP_747_HOME/jboss-modules.jar to the classpath of the standalone remote EJB client application:

$ java -cp jboss-modules.jar:jboss-client.jar:standalone-ejbclient-app.jar org.example.ejb.MyClient

Root Cause

This content is not included.JBEAP-24148

A change came into effect with EJB Client v 4.0.45. which JBoss Modules had been referencing for a long time.
[1] Content from github.com is not included.Content from github.com is not included.https://github.com/wildfly/jboss-ejb-client/commit/d620c9df2d050e2e218e18c23991ab97915ecd5d

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