我通过 maven 制作了一个 wicket-atmosphere webapp，它可以工作。如果我在没有 maven 的情况下创建了一个新的 webapp，并且我将所有依赖项复制为 jar，它就不再起作用了。
在 AjaxLink 的 onClick 中，我调用 EventBus.get().post() 并导致 NullPoiinterException。您可以在下面阅读完整的堆栈跟踪。我刚刚错过了什么？
public void onClick(AjaxRequestTarget art){
EventBus.get().post( message = getRandomText() );
}
罐子：
javax.servlet-api-3.0.1.jar
slf4j-simple-1.6.4.jar
slf4j-api-1.6.4.jar
wicket-core-6.9.0.jar
wicket-request-6.9.0.jar
wicket-util-6.9.0.jar
wicket-atmosphere-0.10.jar
atmosphere-compat-jbossweb-1.0.8.jar
atmosphere-compat-tomcat-1.0.8.jar
atmosphere-compat-tomcat7-1.0.8.jar
atmosphere-runtime-1.0.8.jar
guava-11.0.0.jar
jsr305-1.3.9.jar
我的xmls：
META-INF/context.xml
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<!-- <Loader className="org.atmosphere.util.AtmosphereClassloader"/> -->
<Loader delegate="true"/>
</Context>
META-INF/atmosphere.xml
<atmosphere-handlers>
<atmosphere-handler context-root="/*"
class-name="org.atmosphere.handler.ReflectorServletProcessor">
<property name="filterClassName" value="com.myapp.wicket.DebugWicketFilter" />
</atmosphere-handler>
</atmosphere-handlers>
WEB-INF/web.xml：
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>myproject</display-name>
<servlet>
<description>Atmospherefilter</description>
<servlet-name>Atmospherefilter</servlet-name>
<servlet-class>org.atmosphere.cpr.AtmosphereServlet</servlet-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>com.myapp.wicket.Application</param-value>
</init-param>
<init-param>
<param-name>configuration</param-name>
<param-value>development</param-value>
</init-param>
<init-param>
<param-name>org.atmosphere.useWebSocket</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>org.atmosphere.useNative</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>org.atmosphere.cpr.CometSupport.maxInactiveActivity</param-name>
<param-value>30000</param-value>
</init-param>
<init-param>
<param-name>filterMappingUrlPattern</param-name>
<param-value>/*</param-value>
</init-param>
<init-param>
<param-name>org.atmosphere.websocket.WebSocketProtocol</param-name>
<param-value>org.atmosphere.websocket.protocol.EchoProtocol</param-value>
</init-param>
<init-param>
<param-name>org.atmosphere.cpr.broadcastFilterClasses</param-name>
<param-value>org.apache.wicket.atmosphere.TrackMessageSizeFilter</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
<async-supported>true</async-supported>
</servlet>
<servlet-mapping>
<servlet-name>Atmospherefilter</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
WEB-INF/beans.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/beans_1_0.xsd">
</beans>
WEB-INF/glassfish-web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glassfish-web-app PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Servlet 3.0//EN" "http://glassfish.org/dtds/glassfish-web-app_3_0-1.dtd">
<glassfish-web-app error-url="">
<parameter-encoding default-charset="UTF-8"/>
<class-loader delegate="true"/>
</glassfish-web-app>
com/myapp/wicket/DebugWicketFilter.java
public class DebugWicketFilter extends WicketFilter {
private static final Logger log = LoggerFactory.getLogger(DebugWicketFilter.class);
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
log.info("URI: " + request.toString());
super.doFilter(request, response, chain);
}
}
完整的堆栈跟踪：
WicketMessage: Method onRequest of interface org.apache.wicket.behavior.IBehaviorListener targeted at org.apache.wicket.ajax.markup.html.AjaxLink$1@32048 on component [AjaxLink [Component id = link]] threw an exception
java.lang.NullPointerException
at org.apache.wicket.protocol.http.servlet.ServletWebRequest.getContextRelativeUrl(ServletWebRequest.java:194)
at org.apache.wicket.protocol.http.servlet.ServletWebRequest.<init>(ServletWebRequest.java:113)
at org.apache.wicket.protocol.http.servlet.ServletWebRequest.<init>(ServletWebRequest.java:83)
at org.apache.wicket.protocol.http.WebApplication.newWebRequest(WebApplication.java:448)
at org.apache.wicket.atmosphere.EventBus.post(EventBus.java:318)
at org.apache.wicket.atmosphere.EventBus.postToSingleResource(EventBus.java:298)
at org.apache.wicket.atmosphere.EventBus.post(EventBus.java:273)
at com.myapp.wicket.HomePage$1.onClick(HomePage.java:28)
at org.apache.wicket.ajax.markup.html.AjaxLink$1.onEvent(AjaxLink.java:86)
at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:123)
at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:626)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.wicket.RequestListenerInterface.internalInvoke(RequestListenerInterface.java:258)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:241)
at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.invokeListener(ListenerInterfaceRequestHandler.java:247)
at org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:226)
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:861)
at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:259)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282)
at com.myapp.wicket.DebugWicketFilter.doFilter(DebugWicketFilter.java:34)
at org.atmosphere.util.AtmosphereFilterChain.doFilter(AtmosphereFilterChain.java:155)
at org.atmosphere.util.AtmosphereFilterChain.invokeFilterChain(AtmosphereFilterChain.java:132)
at org.atmosphere.handler.ReflectorServletProcessor$FilterChainServletWrapper.service(ReflectorServletProcessor.java:314)
at org.atmosphere.handler.ReflectorServletProcessor.onRequest(ReflectorServletProcessor.java:172)
at org.atmosphere.cpr.AsynchronousProcessor.action(AsynchronousProcessor.java:256)
at org.atmosphere.cpr.AsynchronousProcessor.suspended(AsynchronousProcessor.java:166)
at org.atmosphere.container.GrizzlyCometSupport.service(GrizzlyCometSupport.java:119)
at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:1307)
at org.atmosphere.cpr.AtmosphereServlet.doPost(AtmosphereServlet.java:293)
at org.atmosphere.cpr.AtmosphereServlet.doGet(AtmosphereServlet.java:279)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)