提交commandButton后出现JSF 2.0 NullPointerException异常 [英] JSF 2.0 NullPointerException exception after submitting commandButton

问题描述

在将JSF从1.2迁移到2.0之后，我在提交commandButton之后开始收到异常:

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

javax.faces.FacesException: java.lang.NullPointerException在 org.apache.myfaces.shared_impl.context.ExceptionHandlerImpl.wrap(ExceptionHandlerImpl.java:241) 在 org.apache.myfaces.shared_impl.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:156) 在 org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:222) 在 javax.faces.webapp.FacesServlet.service(FacesServlet.java:191) 在 org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 在 org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1166) 在 com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58) 在 org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1157) 在 com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) 在 org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1157) 在 com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122) 在 org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1157) 在 org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) 在 org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 在 org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 在 org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 在 org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 在 com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70) 在 org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 在 com.google.appengine.tools.development.JettyContainerService $ ApiProxyHandler.handle(JettyContainerService.java:349) 在 org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 在 org.mortbay.jetty.Server.handle(Server.java:326) 在 org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) 在 org.mortbay.jetty.HttpConnection $ RequestHandler.content(HttpConnection.java:938) 在 org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755) 在 org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218) 在 org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 在 org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) 在 org.mortbay.thread.QueuedThreadPool $ PoolThread.run(QueuedThreadPool.java:582) 造成原因: java.lang.NullPointerException在 com.sun.facelets.FaceletViewHandler.getRenderedViewId(FaceletViewHandler.java:746) 在 com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:491) 在 com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:553) 在 org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:122) 在 org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:207)

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)

...另外26个

JSF标记:

<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>

推荐答案

在另一个问题中，您提到您正在使用Mojarra 2.0，但是stacktrace指示您在类路径中仍具有MyFaces 1.1.摆脱它.您不能混合使用多个JSF实现.

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.

这篇关于提交commandButton后出现JSF 2.0 NullPointerException异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！