com.sun.faces.application.view.FaceletViewHandlingStrategy上的java.lang.NullPointerException $ MethodRetargetHandlerManager

我正在使用JSF複合組件來重用組件。但是，我不斷收到一個空指針錯誤，我按照我發現的一些教程，但沒有提到這個問題。

堆棧跟蹤補充說：

java.lang.NullPointerException 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy$MethodRetargetHandlerManager$ArbitraryMethodRegargetHandler.retarget(FaceletViewHandlingStrategy.java:1883) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.retargetMethodExpressions(FaceletViewHandlingStrategy.java:772) 
    at com.sun.faces.facelets.tag.jsf.CompositeComponentTagHandler.applyNextHandler(CompositeComponentTagHandler.java:201) 
    at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:190) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120) 
    at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:95) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137) 
    at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:190) 
    at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120) 
    at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:95) 
    at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93) 
    at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:87) 
    at com.sun.faces.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:161) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(FaceletViewHandlingStrategy.java:972) 
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:99) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) 
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) 
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734) 
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673) 
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174) 
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188) 
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191) 
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168) 
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189) 
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114) 
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838) 
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544) 
    at java.lang.Thread.run(Thread.java:745)

我使用Netbean 8.0，JSF是包含在企業應用程序項目，如果引起從一個web應用項目中的任何差異不能確定。

<?xml version='1.0' encoding='UTF-8' ?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" 
     xmlns:h="http://xmlns.jcp.org/jsf/html" 
     xmlns:composite="http://xmlns.jcp.org/jsf/composite" 
     xmlns:f="http://xmlns.jcp.org/jsf/core"> 
    <h:head> 
    </h:head> 
    <h:body> 

     <composite:interface> 
      <composite:attribute name="action"/> 
     </composite:interface> 

     <composite:implementation> 
     <h:form> 
      <h:panelGrid columns="2">  
       <h:panelGroup>Customer Name:</h:panelGroup> 
       <h:panelGroup> 
       <h:inputText value="#{MyMB.customer.name}"> 
        <f:validateRegex pattern="(?:[A-Za-z]+\s*)+"/> 
       </h:inputText> 
       </h:panelGroup> 

       <h:panelGroup>Address:</h:panelGroup> 
       <h:panelGroup> 
       <h:inputText value="#{MyMB.customer.address}"></h:inputText> 
       </h:panelGroup> 

       <h:panelGroup>Date Of Birth:</h:panelGroup> 
       <h:panelGroup> 
        <h:inputText value="#{MyMB.customer.dateOfBirth}"> 
        <f:convertDateTime pattern="MM/dd/yyyy"/> 
       </h:inputText> 
       </h:panelGroup> 

       <h:panelGroup>Gender:</h:panelGroup> 
       <h:panelGroup> 
       <h:selectOneRadio value="#{MyMB.customer.gender}"> 
        <f:selectItem itemValue="Male" itemLabel="Male"/> 
        <f:selectItem itemValue="Female" itemLabel="Female"/> 
       </h:selectOneRadio> 
       </h:panelGroup> 

      </h:panelGrid> 

      <h:commandButton value="Submit" action="#{cc.attrs.action}"></h:commandButton> 

     </h:form> 
     </composite:implementation>  

    </h:body> 
</html>

的index.xhtml

<?xml version='1.0' encoding='UTF-8' ?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" 
     xmlns:h="http://xmlns.jcp.org/jsf/html" 
     xmlns:f="http://xmlns.jcp.org/jsf/core" 
     xmlns:comp="http://java.sun.com/jsf/composite/comp"> 

    <h:head> 
     <title>Customers Management</title> 
    </h:head> 
    <h:body> 
     <h:button value="Register Customer" outcome="register.xhtml"></h:button> 
     <h:button value="Update Customer Info" outcome="update.xhtml"></h:button> 

     <comp:customerForm action="#{MyMB.findCustomer()}"></comp:customerForm> 

     <h:panelGrid columns="2"> 
      <h:panelGroup> 
      </h:panelGroup> 
      <h:panelGroup> 
       <h:form> 
        <h:selectOneListbox style="margin-left: 100px; width:200px; height:120px" value="#{MyMB.customer}"> 
         <f:selectItems value="#{MyMB.listOfCust}"/> 
        </h:selectOneListbox> 
        <h:commandButton value="Remove" action="#{MyMB.removeCustomer()}"></h:commandButton> 
        <h:commandButton value="Update Customer Info" action="update.xhtml"></h:commandButton> 
       </h:form> 
      </h:panelGroup> 
     </h:panelGrid> 
    </h:body> 
</html>

來源

2014-05-04 MikeNQ

試試這個

<composite:attribute name="action" method-signature="java.lang.String action()"/>

來源

2014-10-01 05:48:19 Iqbal

com.sun.faces.application.view.FaceletViewHandlingStrategy上的java.lang.NullPointerException $ MethodRetargetHandlerManager

回答

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