Hi,
I am trying to use a GWT service with Spring.
I am using DispatcherServlet from Spring, GWTHandler and my service is
defined as a bean in a mywebapp-servlet.xml file.
I have also beans intialized at startup with ContextLoadListener.
My service works fine except if I try to call getServletContext from
it. In that case I have a NullPointerException. As a consequence I can
not make reference o my other beans from my service.
java.lang.NullPointerException: null
at
com.google.gwt.user.server.rpc.RPCServletUtils.writeResponseForUnexpectedFailure
(RPCServletUtils.java:248)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.doUnexpectedFailure
(RemoteServiceServlet.java:285)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost
(RemoteServiceServlet.java:99)
at com.mycompany.admin.admintool.server.GWTController.handleRequest
(GWTController.java:35)
at
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle
Details of my web.xml
<servlet>
<servlet-name>mywebapp</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</
servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mywebapp</servlet-name>
<url-pattern>/geofamilyadmingwt/mywebapp.rpc</url-pattern>
</servlet-mapping>
I have some other beans that are initialized with
ContextLoaderListener :
<listener>
<listener-
class>org.springframework.web.context.ContextLoaderListener</listener-
class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/main-context.xml /WEB-INF/dao-context.xml /WEB-
INF/business-context.xml /WEB-INF/drivers-context.xml /WEB-INF/map-
context.xml</param-value>
</context-param>
Code of my GWTController :
public class GWTController extends RemoteServiceServlet implements
Controller {
// Instance fields
private RemoteService remoteService;
private Class remoteServiceClass;
private ServletContext servletContext;
// Public methods
/**
* Call GWT's RemoteService doPost() method and return null.
*
* @param request The current HTTP request
* @param response The current HTTP response
* @return A ModelAndView to render, or null if handled directly
* @throws Exception In case of errors
*/
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws Exception {
super.doPost(request, response);
return null; // response handled by GWT RPC over XmlHttpRequest
}
/**
* Process the RPC request encoded into the payload string and
return a
* string that encodes either the method return or an exception
thrown by
* it.
* @param payload The RPC payload
*/
public String processCall(String payload) throws
SerializationException {
try {
RPCRequest rpcRequest = RPC.decodeRequest(payload,
this.remoteServiceClass);
// delegate work to the spring injected service
return RPC.invokeAndEncodeResponse(this.remoteService,
rpcRequest
.getMethod(), rpcRequest.getParameters());
} catch (IncompatibleRemoteServiceException e) {
getServletContext()
.log(
"An IncompatibleRemoteServiceException was thrown
while processing this call.",
e);
return RPC.encodeResponseForFailure(null, e);
}
}
@Override
public ServletContext getServletContext() {
return servletContext;
}
public void setServletContext(ServletContext servletContext) {
this.servletContext = servletContext;
}
/**
* Setter for Spring injection of the GWT RemoteService object.
*
* @param RemoteService
* The GWT RemoteService implementation that will be
delegated to
* by the {...@code GWTController}.
*/
public void setRemoteService(RemoteService remoteService) {
this.remoteService = remoteService;
this.remoteServiceClass = this.remoteService.getClass();
}
}
Code of my service implementation:
@SuppressWarnings("serial")
public class GreetingServiceImpl extends RemoteServiceServlet
implements
GreetingService {
private transient ApplicationContext ac;
private ClientBusiness clientBusiness;
public String greetServer(String clientLogin) {
String result = "Hello";
boolean res;
String serverInfo = this.getServletContext().getServerInfo();
<--
throws the NullPointerException
return result;
}
I tried to override getServletContext method with the code below but
no success.
@Override
public ServletContext getServletContext() {
return getThreadLocalRequest().getSession().getServletContext
();
}
How can I solve this problem ?
Thanks,
C.
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Google Web Toolkit" group.
To post to this group, send email to Google-Web-Toolkit@googlegroups.com
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/Google-Web-Toolkit?hl=en
-~----------~----~----~----~------~----~------~--~---
