4 Replies Latest reply on Aug 14, 2017 1:21 PM by gir489

DefaultServlet

gir489 Aug 10, 2017 1:32 PM

I'm currently battling with a servlet trying to deploy and locate the DefaultServlet class from undertow. Originally it was complaining about org.apache.catalina.servlets.DefaultServlet, and I figured this was from how we were using jbossweb.jar, so I removed that dependency from the ANT build, and replaced it with undertow-servlet-1.3.15.Final.jar. But now it's complaining it can't find undertow which makes no sense... So I think there's a greater issue at hand here, of Wildfly not loading modules for me properly, and I'm not sure why... If I drop the undertow-servlet-1.3.15.Final.jar in the lib folder, that specific error goes away, but then it complains about java.lang.NoClassDefFoundError: Lio/undertow/server/handlers/resource/ResourceManager;, which seems like it wants another JAR.

I don't think it'd be a bright idea to tie our app to specific version of Wildfly, as we learned what happens when you do that with JBoss 4... So I'd rather have it try to resolve it through the Wildfly resource manager.

1. Re: NoClassDefFoundError: Failed to link com/internal/DirectoryServlet (Module "deployment.app.ear:main" from Service Module Loader): io/undertow/servlet/handlers/DefaultServlet

ctomc Aug 11, 2017 5:46 AM (in response to gir489)

where do you get this CNFE? at your build?
what is your code doing that needs direct access to DefaultServlet (and it did with jboss-web as well)

the class you are looking for is in undertow-core jar
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2. Re: NoClassDefFoundError: Failed to link com/internal/DirectoryServlet (Module "deployment.app.ear:main" from Service Module Loader): io/undertow/servlet/handlers/DefaultServlet

gir489 Aug 11, 2017 9:08 AM (in response to ctomc)

It's happening during the deploy, when Wildfly is trying to link my custom servlet with the runtime.
It's extending it so it can intercept each call to the servlet, and check if the URL is valid, if it's not, it forwards the request to the main page.

I'm aware of this, as I'm currently just dropping the core and IO JARs in to the lib folder and bypassing this error, but I'd rather have Wildfly load the latest JAR it comes with, from the resource loader.
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3. Re: NoClassDefFoundError: Failed to link com/internal/DirectoryServlet (Module "deployment.app.ear:main" from Service Module Loader): io/undertow/servlet/handlers/DefaultServlet

walkerca Aug 13, 2017 5:02 PM (in response to gir489)

Have you considered a standard Servlet Filter to intercept all the calls going to your Servlets? That will be more portable.
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4. Re: NoClassDefFoundError: Failed to link com/internal/DirectoryServlet (Module "deployment.app.ear:main" from Service Module Loader): io/undertow/servlet/handlers/DefaultServlet

gir489 Aug 14, 2017 1:21 PM (in response to walkerca)
Thanks. I looked in to what Undertow was extending for DefaultServlet and it was HttpServlet from the javax library. Removing that undertow dependency actually fixed an unusual error I was dealing with:

Caused by: java.lang.ClassCastException: io.undertow.servlet.spec.ServletContextImpl cannot be cast to io.undertow.servlet.spec.ServletContextImpl
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