I move/rename the package where my servlet are and I get this error :
java.lang.ClassNotFoundException: fr.bordeaux.contactapp.Exceptions.AuthenticationException
I'm new to Eclipse and Java. I undo the rename but errors persist.
Everybody have an idea that I have to do ?
Thanks for your help.
There are the trace here :
Caused by: java.lang.NoClassDefFoundError: fr/bordeaux/contactapp/Exceptions/AuthenticationException
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2499)
at java.lang.Class.getDeclaredFields(Class.java:1811)
at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106)
at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:256)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:132)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:65)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:334)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:774)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5053)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 6 more
Caused by: java.lang.ClassNotFoundException: fr.bordeaux.contactapp.Exceptions.AuthenticationException
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1305)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157)
... 20 more
I'm using an older version of Tomcat, so this may or may not help.
Check for a file named web.xml within the WEB-INF folder. I'm using Netbeans, so for me it's under src/main/webapp/WEB-INF - Eclipse may place it elsewhere.
Within that file, you specify the classes used to run your servlet or filter. It's possible that your refactor did not modify the contents of the web.xml file.
Good luck!
What you need to focus on in your error stacktrace is :
Caused by: java.lang.NoClassDefFoundError: fr/bordeaux/contactapp/Exceptions/AuthenticationException
Is seems that you are still referencing the class AuthenticationException
In the package fr.bordeaux.contactapp.Exceptions
And this class doesn't exist there...
PS1: java is case sensitive
Ps2: by convention, packages in Java are lowercase
in my case the error was fixed by adding "/" in url-pattern ,which i forgot to use.After adding "/" the server started successfully. eg
<servlet-mapping>
<servlet-name>imp_servlet</servlet-name>
<url-pattern>/implement_servlet</url-pattern>
</servlet-mapping>
Related
When I try to access Services, Validate and Administration link on the URL http://localhost:82/SOAPDemo/, where my Axis2 Web Application is deployed, it gives me the following error :
Servlet.init() for servlet AxisServlet threw exception
At the back-end, while apache tomcat 7 is being started in eclipse, it shows me the following warning :
[WARN] Unable to instantiate deployer org.apache.axis2.deployment.ServiceDeployer;
I solved this by adding axis2-jaxws.jar in the classpath.
You can integrate it with maven : http://mvnrepository.com/artifact/org.apache.axis2/axis2-jaxws
I got the same issue when I use axis2 1.7.9, then I tried to follow
"I solved this by adding axis2-jaxws.jar in the classpath. You can integrate it with maven : http://mvnrepository.com/artifact/org.apache.axis2/axis2-jaxws", solution by Pierre-Yves Le Dévéhat
But it didn't work. Then I tried the
"I probably hit the same issue, here is the call stack:" ->
"I fixed it with old axis2 1.6.4 instead of 1.7.1 installation and new project creation", solution by user6140506, edited by TeWu
then the error is fixed.
axis2 1.6.4 is working for me...
I probably hit the same issue, here is the call stack:
[WARN] Unable to instantiate deployer org.apache.axis2.deployment.ServiceDeployer; see debug logs for more details
avr. 28, 2016 6:27:14 PM org.apache.catalina.core.ApplicationContext log
GRAVE: StandardWrapper.Throwable
java.lang.NoClassDefFoundError: org/apache/ws/commons/schema/resolver/URIResolver
at org.apache.axis2.deployment.ModuleDeployer.deploy(ModuleDeployer.java:128)
at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:144)
at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:585)
at org.apache.axis2.deployment.RepositoryListener.init(RepositoryListener.java:264)
at org.apache.axis2.deployment.RepositoryListener.init2(RepositoryListener.java:66)
at org.apache.axis2.deployment.RepositoryListener.<init>(RepositoryListener.java:61)
at org.apache.axis2.deployment.DeploymentEngine.loadRepository(DeploymentEngine.java:152)
at org.apache.axis2.deployment.WarBasedAxisConfigurator.getAxisConfiguration(WarBasedAxisConfigurator.java:233)
at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContext(ConfigurationContextFactory.java:64)
at org.apache.axis2.transport.http.AxisServlet.initConfigContext(AxisServlet.java:620)
at org.apache.axis2.transport.http.AxisServlet.init(AxisServlet.java:471)
at org.apache.axis2.webapp.AxisAdminServlet.init(AxisAdminServlet.java:60)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1238)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1151)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1038)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4996)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.apache.ws.commons.schema.resolver.URIResolver
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1305)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1139)
... 24 more
I fixed it with old axis2 1.6.4 instead of 1.7.1 installation and new project creation
I am getting the exception below when launching Tomcat 7.0.54 with my web app. This same webapp launches fine when running tomcat through Eclipse. I initially deployed as a war file, then as a exploded war. The exception is only seen when not running in Eclipse. I have tried it on multiple platforms.
I thought this could be a result of the javax.inject libs not being in the tomcat classpath when it is parsing through the manifest files, so I added the javax.inject.jar file to the tomcat lib directory... same deal. I actually cannot find in any file the argument value "javax-inject-Extension-Name".
Has anyone seen this, or have a suggestion?
Thanks.
SEVERE: ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/rdf.service]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1083)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1880)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: javax.inject-Extension-Name
at java.util.jar.Attributes$Name.<init>(Attributes.java:464)
at java.util.jar.Attributes.getValue(Attributes.java:116)
at org.apache.catalina.util.ManifestResource.getRequiredExtensions(ManifestResource.java:185)
at org.apache.catalina.util.ManifestResource.processManifest(ManifestResource.java:154)
at org.apache.catalina.util.ManifestResource.<init>(ManifestResource.java:50)
at org.apache.catalina.util.ExtensionValidator.validateApplication(ExtensionValidator.java:196)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5289)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more
The issue ended up being with a dependent jar that I had pulled off of github, and had built with maven. That pom file specified the option to addExtensions when building the jar with the maven jar plugin. One of the extensions was javax.inject... however, the maven jar plugin turns this into java_inject-Extension-Name, but leaves it as javax.inject in the Extensions-List... this disconnect is what caused the issue.
When running in eclipse, it must not be doing this same verification. Rebuilding the jar without the extensions in the Manifest.mf file fixed the issue.
I created dynamic web project in eclipse and want to add httpcore-4.3.2.jar lib. Every time I try to add it, Tomcat stops working. I have to use HttpClient and I can't use anything else.
How to resolve this problem?
this is the error message:
Grave: Exception starting Context with name [/FitsInterface]
org.apache.catalina.LifecycleException: Failed to start component
[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/FitsInterface]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3954)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1345)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)
....
....
Caused by: java.lang.NoClassDefFoundError: org/apache/http/HttpEntity
....
Caused by: java.lang.ClassNotFoundException: org.apache.http.HttpEntity
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
... 22 more
I found a solution: you have to deploy the libraries you included in the project build path.
If you are using eclipse, then: Properties > Deployment Assembly > add libraries from build path
We are trying to create a functional example with Hibernate, JBoss7, Beans and Servlets using Eclipse as an IDE.
In other example project we were able to make functional Servlets, and we were able to use Hibernate.
We created two eclipse projects:
A Dynamic web project, an Enterprise Java Beans (EJB) project and a EAR project connecting both.
Running a simple test.java file which uses hibernate (and worked on other projects), we the get errors:
Initial SessionFactory creation failed.org.hibernate.cfg.beanvalidation.IntegrationException: Error activating Bean Validation integration
Exception in thread "main" java.lang.ExceptionInInitializerError
at exercicio.SessionFactoryUtil.<clinit>(SessionFactoryUtil.java:20)
at exercicio.DataBaseInterface.<init>(DataBaseInterface.java:17)
at exercicio.Test.main(Test.java:9)
Caused by: org.hibernate.cfg.beanvalidation.IntegrationException: Error activating Bean Validation integration
at org.hibernate.cfg.beanvalidation.BeanValidationIntegrator.integrate(BeanValidationIntegrator.java:156)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:303)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1750)
at exercicio.SessionFactoryUtil.configureSessionFactory(SessionFactoryUtil.java:32)
at exercicio.SessionFactoryUtil.<clinit>(SessionFactoryUtil.java:17)
... 2 more
Caused by: java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
at org.hibernate.validator.util.LoggerFactory.make(LoggerFactory.java:29)
at org.hibernate.validator.util.Version.<clinit>(Version.java:24)
at org.hibernate.validator.engine.ConfigurationImpl.<clinit>(ConfigurationImpl.java:59)
at org.hibernate.validator.HibernateValidator.createGenericConfiguration(HibernateValidator.java:41)
at javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:269)
at javax.validation.Validation.buildDefaultValidatorFactory(Validation.java:111)
at org.hibernate.cfg.beanvalidation.TypeSafeActivator.getValidatorFactory(TypeSafeActivator.java:445)
at org.hibernate.cfg.beanvalidation.TypeSafeActivator.activate(TypeSafeActivator.java:96)
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 org.hibernate.cfg.beanvalidation.BeanValidationIntegrator.integrate(BeanValidationIntegrator.java:150)
... 6 more
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 19 more
The problem now seems to be around the jars that we included using project Properties > Java Build Path > Add External Jars for the EJB project:
We added the slf4j-jdk14-1.7.5.jar and hibernate jars but the exception log appears to be indicating that we are still missing some jar.
If we remove the jars from the Java Build Path, the exception log is the same. So we think that the jars are not being deployed correctly, or some extra configuration is required... even thought they appear in the /lib folder inside the EJB project deployment folder.
Is there any procedure we are missing, or any probable causes to investigate? I'll add more info if needed. Thanks.
When using JBoss7 not all Jars are available to the application by default (for example slf4j). You have to specify which modules should be included in the classpath of the application by putting this information into a file in your application.
I always do it by adding jboss-deployment-structure.xml into my application (the EAR in your case).
Here's how https://docs.jboss.org/author/display/AS7/Class+Loading+in+AS7.
(The name of the module in your case would be org.slf4j)
Throwing slf4j jar in the libs folder can create a conflict with the slf4j module already included in JB7 by default... you have to add the dependency to your jboss-deployment-structure.xml
But if your hibernate jars are in the libs folder, they could fail resolve the dependency as well too... the way to go in JB7 would be to make a module for Hibernate too, the Nightie builds of JB7 already include an hibernate module, you could just copy the module from there, then add it to your jboss-deployment-structure.xml
I have a problem running my gwt2.4rc1 application in a tomcat. The problem occurs when I try to make a requestfactory call. Then I get the exception at the bottom.
When I run GWT in development mode everything works fine. The gwt-dev. jar is in the lib folder of my webapp. I am using maven for dependency management. Could there be a problem with my configuration? I already had the error with gwt2.4 beta. If there are any other information required to solve this problem I am glad to provide them.
Regards,
Arne
SEVERE: Unexpected error
com.google.web.bindery.requestfactory.server.UnexpectedException: Unexpected checked exception
at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.die(ServiceLayerDecorator.java:216)
at com.google.web.bindery.requestfactory.server.ServiceLayerCache.getOrCache(ServiceLayerCache.java:242)
at com.google.web.bindery.requestfactory.server.ServiceLayerCache.resolveRequestFactory(ServiceLayerCache.java:198)
at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:201)
at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:125)
at com.google.web.bindery.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:133)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:261)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:175)
at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:81)
at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:162)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:242)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:203)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:558)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:242)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:259)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:281)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)
Caused by: java.lang.NoClassDefFoundError: com/google/gwt/dev/util/StringKey
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2804)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1144)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1639)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1517)
at com.google.web.bindery.requestfactory.server.RequestFactoryInterfaceValidator.validateProxy(RequestFactoryInterfaceValidator.java:1594)
at com.google.web.bindery.requestfactory.server.RequestFactoryInterfaceValidator.validateEntityProxy(RequestFactoryInterfaceValidator.java:828)
at com.google.web.bindery.requestfactory.server.RequestFactoryInterfaceValidator.maybeCheckProxyType(RequestFactoryInterfaceValidator.java:1540)
at com.google.web.bindery.requestfactory.server.RequestFactoryInterfaceValidator.getDomainType(RequestFactoryInterfaceValidator.java:1374)
at com.google.web.bindery.requestfactory.server.RequestFactoryInterfaceValidator.createDomainMethod(RequestFactoryInterfaceValidator.java:1192)
at com.google.web.bindery.requestfactory.server.RequestFactoryInterfaceValidator.checkClientMethodInDomain(RequestFactoryInterfaceValidator.java:1079)
at com.google.web.bindery.requestfactory.server.RequestFactoryInterfaceValidator.validateRequestContext(RequestFactoryInterfaceValidator.java:909)
at com.google.web.bindery.requestfactory.server.RequestFactoryInterfaceValidator.validateRequestFactory(RequestFactoryInterfaceValidator.java:964)
at com.google.web.bindery.requestfactory.server.ResolverServiceLayer.resolveRequestFactory(ResolverServiceLayer.java:187)
at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.resolveRequestFactory(ServiceLayerDecorator.java:172)
at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.resolveRequestFactory(ServiceLayerDecorator.java:172)
at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.resolveRequestFactory(ServiceLayerDecorator.java:172)
at com.google.web.bindery.requestfactory.server.ServiceLayerDecorator.resolveRequestFactory(ServiceLayerDecorator.java:172)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.google.web.bindery.requestfactory.server.ServiceLayerCache.getOrCache(ServiceLayerCache.java:233)
... 32 more
Caused by: java.lang.ClassNotFoundException: com.google.gwt.dev.util.StringKey
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1672)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1517)
... 57 more
There's a fix for this on its way over from RC to trunk. In the mean time, remove gwt-servlet from your dependencies and use requestfactory-servlet.jar instead.
I've always understood gwt-dev.jar to be the compiler and other development tools. If you believe that, there should be no dependency on it from your own code, and there is no reason for it to be in the WEB-INF/lib folder of your war file.
I see from this question that at least one other contributer to SO feels the same way, but the belief doesn't appear to be universal.
I'll update this answer if I can find anything one way or the other in the GWT docs.
Update:
The closest thing I could find was Organize Projects which shows gwt-dev as a referenced library not present in WEB-INF/lib. I can't find anything official that says either that you can or can't deploy it to your web server. In an old book GWT In Action (Hanson, 2007), page 551 says
You should never deploy the gwt-user.jar and gwt-dev.jar files to your server,
because they will interfere with your server; these JAR files contain their own
Tomcat server code, which is used when you're testing in hosted mode.
This is clearly out of date, since hosted mode isn't called that anymore and uses an embedded Jetty server rather than Tomcat, but that's the basis for my belief.
Ok I made it working :)
I used the gwt version compiled from here:
http://code.google.com/p/google-web-toolkit/source/browse/#svn%2Freleases%2F2.4
I did put gwt-servlet.jar and requestfactory-servlet.jar as dependencies in my project. The problem in the other thread occured because I used my own group-id for the compiled jars, so these were not used by gin and the gwt-maven-plugin. No everything works fine :)
Thanks for the help though!!