A RPC problem

[cqiao]

[ERROR] Unable to instantiate 'com.cqiao.cmw.server.SynthMineParamsServiceImpl'
java.lang.IllegalAccessException: Class com.google.gwt.dev.shell.GWTShellServlet can not access a member of class com.cqiao.cmw.server.SynthMineParamsServiceImpl with modifiers ""
at com.google.gwt.dev.shell.GWTShellServlet.tryGetOrLoadServlet(GWTShellServlet.java:953)
at com.google.gwt.dev.shell.GWTShellServlet.service(GWTShellServlet.java:278)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)

//===========================
the endpoint set:
SynthMineParamsServiceAsync synthMineParamsService=
(SynthMineParamsServiceAsync) GWT.create(SynthMineParamsService.class);
ServiceDefTarget endpoint = (ServiceDefTarget) synthMineParamsService;
String moduleRelativeURL = GWT.getModuleBaseURL() + "service";
endpoint.setServiceEntryPoint(moduleRelativeURL);
Registry.register("synthMineParamsService", synthMineParamsService);
//==========================
and the servlet in .gwt.xml:
<servlet path='/service' class='com.cqiao.cmw.server.SynthMineParamsServiceImpl'></servlet>
//=========================
what is wrong?

[cqiao]

If the endpoint and the -GWT.XML are both right, please check you service implemented class. It needs a public, zero-argument constructor.