erreur lors de l'appel de service GWT avec Spring

bonjour,

J'essaye d'injecter un service gwt avec Spring mais je ne m'en sors pas.
J'ai une erreur lors de l'appel d'un service GWT :

Code:

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[WARN] StandardContext[]Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.util.List bookstore.web.client.controllers.CatalogueControleur.rechercheLivres(bookstore.web.client.form.LivreForm)' threw an unexpected exception: java.lang.NullPointerException
	at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:360)
	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:546)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:164)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at com.google.gwt.dev.shell.GWTShellServlet.service(GWTShellServlet.java:289)
	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)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	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.ContainerBase.invoke(ContainerBase.java:929)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException: null
	at bookstore.web.server.CatalogueControleurImpl.rechercheLivres(CatalogueControleurImpl.java:62)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:164)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at com.google.gwt.dev.shell.GWTShellServlet.service(GWTShellServlet.java:289)
	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)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	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.ContainerBase.invoke(ContainerBase.java:929)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
	at java.lang.Thread.run(Thread.java:619)

J'utilise le plug in Cypal (peut etre que le probleme viens de la ?)
Et je precise que sur Tomcat je n'ai pas d'erreur,
L'appel du service se passe bien.
Pourriez vous me donner une indication sur la recherche de ce probleme.
J'ai beau chercher mais sans succés.
Merci.

Je rajoute un peu plus de detail,
voici le web.xml :

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4"
	xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<display-name>test</display-name>
 
 
 
	<!-- Spring context location -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:application-context.xml,
					 classpath:GWTSpring-servlet.xml
		</param-value>
	</context-param>
 
	<!-- load Spring application context  -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<listener>
		<listener-class>
			org.springframework.web.context.request.RequestContextListener</listener-class>
	</listener>
 
	<servlet>
		<servlet-name>GWTSpring</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
 
	<servlet-mapping>
		<servlet-name>GWTSpring</servlet-name>
		<url-pattern>*.rpc</url-pattern>
	</servlet-mapping>
 
	<welcome-file-list>
		<welcome-file>Index.html</welcome-file>
	</welcome-file-list>
</web-app>

et le GWTSpring-servlet.xml :

Code:

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
 
 
 
	<bean id="urlMapping"
		class="org.gwtwidgets.server.spring.GWTHandler">
		<property name="mappings">
			<map>
 
				<entry key="/ctrlIdentification.rpc" value-ref="rpc.Identification" />
				<entry key="/ctrlUtilisateur.rpc" value-ref="rpc.Utilisateur" />
				<entry key="/ctrlCatalogue.rpc" value-ref="rpc.Catalogue" />
 
			</map>
		</property>
	</bean>
 
<bean id="rpc.Catalogue" class="bookstore.web.server.CatalogueControleurImpl">
		<property name="livreService" ref="service.livre" />
</bean>

Je n'ai jamais utilisé Spring avec gwt mais ton erreur est assez explicite :

Code:

bookstore.web.server.CatalogueControleurImpl.rechercheLivres(CatalogueControleurImpl.java:62)

Dans ta méthode rechercheLivres, en ligne 62, tu as un objet indéfini !!!
Il faut que tu vérifies lequel ? Une solution consiste à regarder sur ta ligne tous les objets qui appelle une méthode (juste avant le point donc)

Exemple : si sur ta ligne, tu as o1.method1(o2.methode2(), o3.methode3());
il faut que tu vérifie o1, o2 et o3 pour identifier celui qui est indéfini.