Migration issue

Before I worked with GWT 2.1 M1 version and all functions worked
normally without any exception. But when I moved to GWT 2.2 version,
UI side works fine, but I can't receive any data from server side
using RPC call. The exception is:

SEVERE: Exception while dispatching incoming RPC call
java.lang.NullPointerException
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.encodeResponseForFailure(GWTRPCServiceExporter.java:
223)
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.handleIncompatibleRemoteServiceException(GWTRPCServiceExporter.java:
370)
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.processCall(GWTRPCServiceExporter.java:
351)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
224)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)
at
org.gwtwidgets.server.spring.GWTRPCServiceExporter.handleRequest(GWTRPCServiceExporter.java:
407)
at
org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:
49)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:
875)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:
809)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:
571)
at
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:
511)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:
290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:
206)
at
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:
96)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:
76)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:
235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:
206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:
233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:
191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:
128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:
102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:
109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:
293)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:
849)
at org.apache.coyote.http11.Http11Protocol
$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:
454)
at java.lang.Thread.run(Thread.java:619)

Can you please help me?

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