JSF 2.0 NullPointerException exception after submitting commandButton

问题

After migrating JSF from 1.2 to 2.0 I begin to receive exception after submitting commandButton:

javax.faces.FacesException: java.lang.NullPointerException at org.apache.myfaces.shared_impl.context.ExceptionHandlerImpl.wrap(ExceptionHandlerImpl.java:241) at org.apache.myfaces.shared_impl.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:156) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:222) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:191) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122) at org.mortbay.jetty.servlet.ServletHandler$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:418) at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) Caused by: java.lang.NullPointerException at com.sun.facelets.FaceletViewHandler.getRenderedViewId(FaceletViewHandler.java:746) at com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:491) at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:553) at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:122) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:207)

... 26 more

JSF markup:

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:t="http://myfaces.apache.org/tomahawk" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core">

<ui:composition template="layout.jsp">
    <ui:define name="title">Редактирование шаблона</ui:define>
    <ui:define name="content">                
            <p>
                <a href="/templates.jsf">Все шаблоны</a>
            </p>
            <h:form>
                <h:inputHidden value="#{template.id}" />
                Name: <h:inputText value="#{template.name}"/> <br/>
                Content Type: <h:inputText value="#{template.contentType}"/> <br/>
                Content: <h:inputTextarea value="#{template.content}"/> <br/>
                Description: <h:inputTextarea value="#{template.description}"/> <br/>
                <h:commandButton value="Сохранить" action="#{template.submit}"> 
                </h:commandButton>

            </h:form>
    </ui:define>
</ui:composition>
</html>

回答1:

In your other question you mentioned that you're using Mojarra 2.0, but the stacktrace indicates that you still have MyFaces 1.1 in the classpath. Get rid of it. You cannot mix multiple JSF implementations.

来源：https://stackoverflow.com/questions/3786772/jsf-2-0-nullpointerexception-exception-after-submitting-commandbutton

标签

jsf

jsf-2