Apache Error for Rest service

   excepción

    javax.servlet.ServletException: Servlet.init() para servlet Jersey REST Service lanzó excepción
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Unknown Source)


    causa raíz

    com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
    com.sun.jersey.server.impl.application.WebApplicationImpl.processRootResources(WebApplicationImpl.java:718)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:590)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:383)
    com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:377)
    com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:242)
    com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:449)
    com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:169)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:281)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:442)
    javax.servlet.GenericServlet.init(GenericServlet.java:212)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Unknown Source)