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Editorial Team
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Asked: 2026-05-26T09:03:14+00:00

I’ve created a new Vaadin (6.6.5) project in eclipse and I’ve tried to deploy

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I’ve created a new Vaadin (6.6.5) project in eclipse and I’ve tried to deploy it on JBoss 7.0 but it gives me a GWT ClassNotFoundException

Caused by: java.lang.ClassNotFoundException: com.google.gwt.user.client.ui.HasWidgets from [Module "deployment.test.war:main" from Service Module Loader]
    at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:191)
    at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:358)
    at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:330)
    at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:330)
    at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:307)
    at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:101)
    ... 64 more

Do I need to do something extra to deploy the gwt libraries?

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1 Answer

  1. Editorial Team

    Seems that some GWT classes in gwt-user.jar required for compiling the Vaadin client side widgetset are loaded by the JBoss7 unnecessarily.

    vaadin.jar contains references to gwt-user.jar but it’s not required during runtime, only during widgetset compilation time. Still JBoss wants to load these classes causing the problem.

    There’s a bug report in JBoss for this: http://community.jboss.org/thread/169575?tstart=0

    As mentioned there, workaround is to include gwt-user.jar to the deployment package in WEB-INF/lib folder with the vaadin.jar, seems to work.

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