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Editorial Team
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Asked: 2026-06-10T11:52:09+00:00

Currently running some webapps on Jboss AS 4/5 and I am testing migration to

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Currently running some webapps on Jboss AS 4/5 and I am testing migration to jboss7. When I try to deploy a jersey based webapp on JBoss AS 7 (full profile with standalone-preview config file), I get:

org.jboss.as.server.deployment.DeploymentUnitProcessingException: Only one JAX-RS Application Class allowed.

I’ve done a bit of hunting around on it and found that RestEasy is the default JAX-RS implementation embedded into Application Server. Posts like http://community.jboss.org/message/579996 and https://issues.jboss.org/browse/JBAS-8830) mention that the RestEasy deployer takes over.

In AS 6, it seems easier to remove the deployer whereas I have not seen any solutions for AS 7.

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1 Answer

  1. Editorial Team

    it has already been mentioned in this post : https://community.jboss.org/message/744530#744530 , you can just ask the resteasy module to not scan for other JAX RS implementations in your webapp; just add this to your web.xml :

    <context-param>
    <param-name>resteasy.scan</param-name>
    <param-value>false</param-value>
</context-param>
<context-param>
    <param-name>resteasy.scan.providers</param-name>
    <param-value>false</param-value>
</context-param>
<context-param>
    <param-name>resteasy.scan.resources</param-name>
    <param-value>false</param-value>
</context-param>

    worked fine for me

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