I always end up with the The ResourceConfig instance does not contain any root

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Editorial Team

Asked: May 26, 20262026-05-26T08:53:18+00:00 2026-05-26T08:53:18+00:00

I always end up with the The ResourceConfig instance does not contain any root

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I always end up with the “The ResourceConfig instance does not contain any root resource classes” error

I shouldn’t even need anything other then jersey-bundle
but without it I get errors regarding the asm.jar

package akiraapps.jerseytest;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

@Path("/hello")
public class Hello {

    // This method is called if TEXT_PLAIN is request
    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String sayPlainTextHello() {
        return "Hello Jersey";
    }

    // This method is called if XML is request
    @GET
    @Produces(MediaType.TEXT_XML)
    public String sayXMLHello() {
        return "<?xml version=\"1.0\"?>" + "<hello> Hello Jersey" + "</hello>";
    }

    // This method is called if HTML is request
    @GET
    @Produces(MediaType.TEXT_HTML)
    public String sayHtmlHello() {
        return "<html> " + "<title>" + "Hello Jersey" + "</title>"
                + "<body><h1>" + "Hello Jersey" + "</body></h1>" + "</html> ";
    }


}

WEB.XML——

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
 <servlet> 
    <servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
      <param-name>com.sun.jersey.config.property.packages</param-name>
      <param-value>akiraapps.jerseytest</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Jersey REST Service</servlet-name>
    <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>
</web-app>

classpath

ERROR LOG:

Jun 16, 2011 11:54:03 AM
com.sun.jersey.api.core.PackagesResourceConfig
init INFO: Scanning for root resource
and provider classes in the packages:
akiraapps.jerseytest.Hello Jun 16,
2011 11:54:03 AM
com.sun.jersey.server.impl.application.WebApplicationImpl
_initiate INFO: Initiating Jersey application, version ‘Jersey: 1.7
05/20/2011 11:43 AM’ Jun 16, 2011
11:54:03 AM
com.sun.jersey.server.impl.application.RootResourceUriRules
SEVERE: The ResourceConfig
instance does not contain any root
resource classes. Jun 16, 2011
11:54:03 AM
org.apache.catalina.core.ApplicationContext
log SEVERE: StandardWrapper.Throwable
com.sun.jersey.api.container.ContainerException:
The ResourceConfig instance does not
contain any root resource classes. at
com.sun.jersey.server.impl.application.RootResourceUriRules.(RootResourceUriRules.java:99)
at
com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1298)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:167)
at
com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:773)
at
com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:769)
at
com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:769)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:764)
at
com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
at
com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
at
com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
at
com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
at
com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
at
com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
at
javax.servlet.GenericServlet.init(GenericServlet.java:160)
at
org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1189)
at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1103)
at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:813)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at
java.lang.Thread.run(Thread.java:662)
Jun 16, 2011 11:54:03 AM
org.apache.catalina.core.StandardWrapperValve
invoke SEVERE: Allocate exception for
servlet Jersey REST Service
com.sun.jersey.api.container.ContainerException:
The ResourceConfig instance does not
contain any root resource classes. at
com.sun.jersey.server.impl.application.RootResourceUriRules.(RootResourceUriRules.java:99)
at
com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1298)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:167)
at
com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:773)
at
com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:769)
at
com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:769)
at
com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:764)
at
com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
at
com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
at
com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
at
com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
at
com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
at
com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
at
javax.servlet.GenericServlet.init(GenericServlet.java:160)
at
org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1189)
at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1103)
at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:813)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at
java.lang.Thread.run(Thread.java:662)

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1 Answer

Editorial Team · Answer 1 · 2026-05-26T08:53:18+00:00

Editorial Team

2026-05-26T08:53:18+00:00Added an answer on May 26, 2026 at 8:53 am

According to Owen,

I right-clicked on my project->Java EE Tools->Update EAR Libraries.
and it seems to be working now.

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