实施和目的：
我实现了一个复合组件，其中包含一个 primefaces p:dataTable。我还为 rowSelect 和 rowUnselect 事件在表中添加了 p:ajax 侦听器，这些事件的侦听器可以由使用复合组件的实际页面定义。
错误情况：
对于 rowSelect 事件及其侦听器，此定义可以正常工作。在未选择行的情况下，调用unselect监听器，但是会抛出异常，表明组合组件在使用页面中无法通过组合组件中实际使用的EL表达式（请参阅日志）解析为动态查找传递的侦听器。这对我来说听起来完全正确，这是行不通的。异常的日志条目被声明为警告，但由于未执行更新定义，因此 jsf 处理周期中断。
问题：
我是否在我的定义中遗漏了一些东西，或者 primefaces p:ajax 实现做了一些不打算做的事情？为什么我在 primefaces unselectRow 事件中遇到这种行为，但在 selectRow 事件中却没有？
我的复合组件是：
<composite:interface>
<composite:attribute name="selectListener" method-signature="void f()" />
<composite:attribute name="selectUpdate" />
<composite:attribute name="unselectListener" method-signature="void f()" />
<composite:attribute name="unselectUpdate" />
</composite:interface>
<composite:implementation>
<p:dataTable id="abnormalityTable" var="abnormality" value="#{abnormalityTableView.model}" lazy="true"
paginator="true" rows="10" rowsPerPageTemplate="5,10,15" selection="#{abnormalityTableView.selectedRow}"
selectionMode="single"
paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}">
<c:if test="#{!empty cc.getValueExpression('selectListener')}">
<p:ajax event="rowSelect" listener="#{cc.attrs.selectListener}" update="#{cc.attrs.selectUpdate}" />
</c:if>
<c:if test="#{!empty cc.getValueExpression('unselectListener')}">
<p:ajax event="rowUnselect" listener="#{cc.attrs.unselectListener}" update="#{cc.attrs.unselectUpdate}" />
</c:if>
<p:column headerText="#{docText['abnormality.name']}" filterBy="#{name}">
<h:outputText value="some dummy output" />
</p:column>
</p:dataTable>
</composite:implementation>
日志中的堆栈跟踪是：
16:59:40,868 WARNUNG [javax.enterprise.resource.webcontainer.jsf.lifecycle] (http-localhost-127.0.0.1-8443-2) Unable to resolve composite component from using page using EL expression '#{cc.attrs.unselectListener}': javax.faces.FacesException: Unable to resolve composite component from using page using EL expression '#{cc.attrs.unselectListener}'
at com.sun.faces.facelets.tag.TagAttributeImpl$AttributeLookupMethodExpression.invoke(TagAttributeImpl.java:444) [jsf-impl-2.1.7-jbossorg-2.jar:]
at org.primefaces.component.behavior.ajax.AjaxBehaviorListenerImpl.processAjaxBehavior(AjaxBehaviorListenerImpl.java:44) [primefaces-3.5-SNAPSHOT.jar:]
at org.primefaces.event.UnselectEvent.processListener(UnselectEvent.java:40) [primefaces-3.5-SNAPSHOT.jar:]
at javax.faces.component.behavior.BehaviorBase.broadcast(BehaviorBase.java:106) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:760) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at javax.faces.component.UIData.broadcast(UIData.java:1071) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at javax.faces.component.UIData.broadcast(UIData.java:1093) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at javax.faces.component.UIData.broadcast(UIData.java:1093) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81) [jsf-impl-2.1.7-jbossorg-2.jar:]
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.1.7-jbossorg-2.jar:]
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) [jsf-impl-2.1.7-jbossorg-2.jar:]
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) [jboss-jsf-api_2.1_spec-2.0.1.Final.jar:2.0.1.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:126) [prettyfaces-core-3.3.2.jar:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:112) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:840) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:622) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:560) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:488) [jbossweb-7.0.13.Final.jar:]
at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:118) [prettyfaces-core-3.3.2.jar:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) [shiro-core-1.2.0.jar:1.2.0]
at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) [shiro-core-1.2.0.jar:1.2.0]
at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:380) [shiro-core-1.2.0.jar:1.2.0]
at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) [shiro-web-1.2.0.jar:1.2.0]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.13.Final.jar:]
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.1.1.Final.jar:7.1.1.Final]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:]
at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_26]