The ResourceConfig instance does not contain any root resource classes

The ResourceConfig instance does not contain any root resource classes

While working with Jetty and Jersey I got this exception which says below:

com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes

com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
	at com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(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:169)
	at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:775)
	at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:771)
	at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766)
	at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
	at com.sun.jersey.spi.container.servlet.ServletContainer$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:244)
	at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:534)
	at org.eclipse.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:417)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:659)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:229)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:370)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
	at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
	at java.lang.Thread.run(Thread.java:745)

• Solution: In my case I was my resource package name was not matching with initparam as below:

• To fix this issue I have to match package name:

• If your configuration is not same as me and you are using your is web application where you should have web.xml then add below:

<init-param>
  <param-name>com.sun.jersey.config.property.packages</param-name>
  <param-value>my.package.name</param-value>
</init-param>

For more information please visit Jetty documentation here