我想构建一个已经包含一些按钮的复合组件，用户可以添加其他按钮。
<composite:interface>
<composite:attribute name="action" required="false" default="cancel" targets="idCancelButton" />
</composite:interface>
<composite:implementation>
<h:panelGroup
layout="block"
style="margin: 10px 0 10px 0; text-align: right;"
styleClass="commandButtons">
<composite:insertChildren />
<p:spacer width="10" height="10" />
<h:commandButton
id="idCancelButton"
value="Cancel"
</h:commandButton>
</h:panelGroup>
</composite:implementation>
对组件的调用看起来像这样
<buttons:cancelButtonGroup>
<p:commandButton id="idSaveButton" action="save" value="save" />
</buttons:cancelButtonGroup>
我在Jetty 6上使用Primefaces（3.0M2）（p：commandButton）和Spring Webflow以及Mojarra 2.0.6。 正如已经描述的here使用action作为属性名称与目标工作正常。唯一的问题是，可能希望在组件内部使用多个预定义按钮。然后action属性不再起作用了。我一直在玩很多但我无法获得一个工作版本，我将属性更改为cancelAction并通过action =“＃{cc.attrs.action}”从按钮引用它。请注意，当我使用Spring Webflow时，取消是我过渡的名称！我不想用返回类型String调用某个函数。我总是得到例外：
2011-07-28 11:15:30,071 [12832806@qtp-10183200-3] WARN exceptionHandler:185 - Handler execution resulted in exception
org.springframework.webflow.execution.FlowExecutionException: Exception thrown in state 'managePhysicalHost' of flow 'host/manageHost'
at org.springframework.webflow.engine.impl.FlowExecutionImpl.wrap(FlowExecutionImpl.java:569)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:263)
at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at info.novatec.np.server.web.filter.ConfigurableDelegatingFilter.doFilter(ConfigurableDelegatingFilter.java:51)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:440)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:943)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: javax.faces.FacesException: Unable to resolve composite component from using page using EL expression '#{cc.attrs.cancelAction}'
at com.sun.faces.facelets.tag.TagAttributeImpl$AttributeLookupMethodExpression.invoke(TagAttributeImpl.java:444)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at org.springframework.faces.webflow.FlowActionListener.processAction(FlowActionListener.java:81)
at org.springframework.faces.model.SelectionTrackingActionListener.processAction(SelectionTrackingActionListener.java:55)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:787)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1252)
at org.springframework.faces.webflow.FlowLifecycle.invokePhase(FlowLifecycle.java:127)
at org.springframework.faces.webflow.FlowLifecycle.execute(FlowLifecycle.java:70)
at org.springframework.faces.webflow.JsfView.processUserEvent(JsfView.java:114)
at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:248)
at org.springframework.webflow.engine.ViewState.resume(ViewState.java:218)
at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
... 31 more
2011-07-28 11:15:30,074 [12832806@qtp-10183200-3] ERROR org.mortbay.log:87 - /ui/main
org.springframework.webflow.execution.FlowExecutionException: Exception thrown in state 'managePhysicalHost' of flow 'host/manageHost'
at org.springframework.webflow.engine.impl.FlowExecutionImpl.wrap(FlowExecutionImpl.java:569)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:263)
at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at info.novatec.np.server.web.filter.ConfigurableDelegatingFilter.doFilter(ConfigurableDelegatingFilter.java:51)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:440)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:943)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: javax.faces.FacesException: Unable to resolve composite component from using page using EL expression '#{cc.attrs.cancelAction}'
at com.sun.faces.facelets.tag.TagAttributeImpl$AttributeLookupMethodExpression.invoke(TagAttributeImpl.java:444)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at org.springframework.faces.webflow.FlowActionListener.processAction(FlowActionListener.java:81)
at org.springframework.faces.model.SelectionTrackingActionListener.processAction(SelectionTrackingActionListener.java:55)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:787)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1252)
at org.springframework.faces.webflow.FlowLifecycle.invokePhase(FlowLifecycle.java:127)
at org.springframework.faces.webflow.FlowLifecycle.execute(FlowLifecycle.java:70)
at org.springframework.faces.webflow.JsfView.processUserEvent(JsfView.java:114)
at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:248)
at org.springframework.webflow.engine.ViewState.resume(ViewState.java:218)
at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
... 31 more
vax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:787)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1252)
at org.springframework.faces.webflow.FlowLifecycle.invokePhase(FlowLifecycle.java:127)
at org.springframework.faces.webflow.FlowLifecycle.execute(FlowLifecycle.java:70)
at org.springframework.faces.webflow.JsfView.processUserEvent(JsfView.java:114)
at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:248)
at org.springframework.webflow.engine.ViewState.resume(ViewState.java:218)
at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
... 31 more
我一直在阅读很多关于复合组件的帖子和文章，但似乎没有人将它们与Spring Webflow混合在一起。或者它并不值得注意，我的问题在其他地方被埋没了。 ：）