primefaces效果不起作用

我正在使用JSF 2和PrimeFaces 4.0。当我运行new.xhtml文件，那么它提供了以下异常：primefaces效果不起作用

Error Rendering View[/NewFile.xhtml]: java.lang.NullPointerException 
    at org.primefaces.renderkit.OutcomeTargetRenderer.getTargetURL(OutcomeTargetRenderer.java:80) [:4.0] 
    at org.primefaces.component.button.ButtonRenderer.buildOnclick(ButtonRenderer.java:93) [:4.0] 
    at org.primefaces.component.button.ButtonRenderer.encodeMarkup(ButtonRenderer.java:53) [:4.0] 
    at org.primefaces.component.button.ButtonRenderer.encodeEnd(ButtonRenderer.java:32) [:4.0] 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) [:2.1.1-FCS] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1763) [:2.1.1-FCS] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759) [:2.1.1-FCS] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759) [:2.1.1-FCS] 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:401) [:2.1.1-FCS] 
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131) [:2.1.1-FCS] 
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) [:2.1.1-FCS] 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [:2.1.1-FCS] 
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) [:2.1.1-FCS] 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410) [:2.1.1-FCS] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.1.0.Final] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.1.0.Final] 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.1.0.Final] 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [:6.1.0.Final] 
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.1.0.Final] 
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final] 
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final] 
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.1.0.Final] 
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.1.0.Final] 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159) [:6.1.0.Final] 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.1.0.Final] 
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.1.0.Final] 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.1.0.Final] 
    at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.1.0.Final] 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.1.0.Final] 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.1.0.Final] 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.1.0.Final] 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.1.0.Final] 
    at java.lang.Thread.run(Unknown Source) [:1.7.0_17] 

22:04:34,939 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/p1].[Faces Servlet]] Servlet.service() for servlet Faces Servlet threw exception: java.lang.NullPointerException 
    at org.primefaces.renderkit.OutcomeTargetRenderer.getTargetURL(OutcomeTargetRenderer.java:80) [:4.0] 
    at org.primefaces.component.button.ButtonRenderer.buildOnclick(ButtonRenderer.java:93) [:4.0] 
    at org.primefaces.component.button.ButtonRenderer.encodeMarkup(ButtonRenderer.java:53) [:4.0] 
    at org.primefaces.component.button.ButtonRenderer.encodeEnd(ButtonRenderer.java:32) [:4.0] 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) [:2.1.1-FCS] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1763) [:2.1.1-FCS] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759) [:2.1.1-FCS] 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759) [:2.1.1-FCS] 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:401) [:2.1.1-FCS] 
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131) [:2.1.1-FCS] 
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) [:2.1.1-FCS] 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [:2.1.1-FCS] 
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) [:2.1.1-FCS] 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410) [:2.1.1-FCS] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.1.0.Final] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.1.0.Final] 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.1.0.Final] 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [:6.1.0.Final] 
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.1.0.Final] 
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final] 
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final] 
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.1.0.Final] 
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.1.0.Final] 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159) [:6.1.0.Final] 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.1.0.Final] 
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.1.0.Final] 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.1.0.Final] 
    at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.1.0.Final] 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.1.0.Final] 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.1.0.Final] 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.1.0.Final] 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.1.0.Final] 
    at java.lang.Thread.run(Unknown Source) [:1.7.0_17]

我的web.xml文件：

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> 
    <display-name>web</display-name> 

    <servlet> 
    <servlet-name>Faces Servlet</servlet-name> 
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> 
    <load-on-startup>1</load-on-startup> 
    </servlet> 
    <servlet-mapping> 
    <servlet-name>Faces Servlet</servlet-name> 
    <url-pattern>/faces/*</url-pattern> 
    </servlet-mapping> 
    <servlet-mapping> 
    <servlet-name>Faces Servlet</servlet-name> 
    <url-pattern>*.xhtml</url-pattern> 
</servlet-mapping> 
</web-app>

我的XHTML文件：

<?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://java.sun.com/jsf/html" 
    xmlns:f="http://java.sun.com/jsf/core" 
    xmlns:ui="http://java.sun.com/jsf/facelets" 
    xmlns:p="http://primefaces.org/ui"> 

<h:head> 
<link type="text/css" rel="stylesheet" href="#{request.contextPath}/css/default.css" /> 
    <style type="text/css"> 
       .ui-widget{font-size:90% !important;} 
       .ui-layout-unit-content{background-image:url('a.jpg');} 
      </style> 
<h:outputScript library="primefaces" name="jquery/jquery.js" target="head" /> 


</h:head> 
<h:body> 
    <h1>Hello World PrimeFaces</h1> 
    <p:inputText /> 
<p:button outcome="productDetail" value="Bookmark" icon="ui-icon-star"></p:button> 
</h:body> 
</html>

我一直面临着这个问题一周，但我无法解决这个问题。

来源

2014-03-13 user249766

是不是缺少一个表单？ – Leo

缺失的形式应该是原因。此答案中的第一点适用于您的方案。 http://stackoverflow.com/questions/2118656/hcommandlink-hcommandbutton-is-not-being-invoked/2120183#2120183 – SRy

唯一需要做的就是创建一个名称为“productDetail.xhtml”的jsf页面（xhtml页面），放在当前可用的xhtml所在的同一目录中。

上面的操作将使您的代码正常工作，并且将您的代码放入h：body的h：body中。否则它会产生如下的警告（如果javax.faces.PROJECT_STAGE设置为开发），

The form component needs to have a UIForm in its ancestry. Suggestion: enclose the necessary components within <h:form>

来源

2014-03-13 19:27:09 Jitesh

primefaces效果不起作用

回答

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