java.lang.NoClassDefFoundError: com/sun/jersey/spi/container/servlet/WebConfig

Question

I upgraded my web project from Jersey 1.x to 2.5. Now I am getting the following error. Not sure why it is looking for WebConfig.

Jul 13, 2014 12:19:04 PM org.glassfish.jersey.server.ApplicationHandler initialize
INFO: Initiating Jersey application, version Jersey: 2.5.1 2014-01-02 13:43:00...
Jul 13, 2014 12:19:04 PM org.apache.catalina.core.ApplicationContext log
SEVERE: StandardWrapper.Throwable
java.lang.NoClassDefFoundError: com/sun/jersey/spi/container/servlet/WebConfig
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
    at java.lang.Class.getDeclaredMethods(Unknown Source)
    at org.glassfish.jersey.server.model.IntrospectionModeller$2.run(IntrospectionModeller.java:236)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.glassfish.jersey.server.model.IntrospectionModeller.getAllDeclaredMethods(IntrospectionModeller.java:230)
    at org.glassfish.jersey.server.model.IntrospectionModeller.checkForNonPublicMethodIssues(IntrospectionModeller.java:170)
    at org.glassfish.jersey.server.model.IntrospectionModeller.doCreateResourceBuilder(IntrospectionModeller.java:118)
    at org.glassfish.jersey.server.model.IntrospectionModeller.access$000(IntrospectionModeller.java:80)
    at org.glassfish.jersey.server.model.IntrospectionModeller$1.call(IntrospectionModeller.java:111)
    at org.glassfish.jersey.server.model.IntrospectionModeller$1.call(IntrospectionModeller.java:108)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.processWithException(Errors.java:255)
    at org.glassfish.jersey.server.model.IntrospectionModeller.createResourceBuilder(IntrospectionModeller.java:108)
    at org.glassfish.jersey.server.model.Resource.from(Resource.java:744)
    at org.glassfish.jersey.server.ApplicationHandler.initialize(ApplicationHandler.java:379)
    at org.glassfish.jersey.server.ApplicationHandler.access$500(ApplicationHandler.java:162)
    at org.glassfish.jersey.server.ApplicationHandler$3.run(ApplicationHandler.java:304)
    at org.glassfish.jersey.internal.Errors$2.call(Errors.java:289)
    at org.glassfish.jersey.internal.Errors$2.call(Errors.java:286)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.processWithException(Errors.java:286)
    at org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:301)
    at org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:311)
    at org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:169)
    at org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:359)
    at javax.servlet.GenericServlet.init(GenericServlet.java:160)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5176)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:656)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1635)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.sun.jersey.spi.container.servlet.WebConfig
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    ... 45 more

Answer 1

You're referencing com.sun.jersey.spi.container.servlet.WebConfig someplace but that class doesn't exist in Jersey 2.x. If you've extended com.sun.jersey.spi.container.servlet.WebConfig in your project, switch to org.glassfish.jersey.servlet.WebConfig.

Also check your web.xml and verify that your Servlet config for Jersey doesn't reference any 1.x components. For 2.x on Tomcat it should look something like this:

<servlet>
    <servlet-name>RestServlet</servlet-name>
    <!-- don't use the com.sun package! -->
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>javax.ws.rs.Application</param-name>
        <!-- be sure this extends the org.glassfish WebConfig -->
        <param-value>com.yourproject.YourRestConfig</param-value>
    </init-param>
</servlet>

If you're using Maven or another dependency management tool, do an analysis of your dependencies and verify that no Jersey 1.x components are being built into your project.