Websocket CdiUtils NPE使用<f：websocket>

时间：2018-05-11 21:16:50

标签： spring websocket jsf-2.3 tomcat9

这个应用程序在TC7，Spring 3和JSF 2.2中运行良好，但我想添加JSF 2.3的推送功能，所以我升级到TC 9.0.8，Spring 5.0.5和JSF 2.3.0之后由于升级导致的简单初始问题应用程序部署正常和Spring Security工作（我可以登录），但后来我收到此错误：

May 11, 2018 2:24:06 PM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
SEVERE: Error Rendering View[/index.xhtml]
java.lang.NullPointerException
    at com.sun.faces.cdi.CdiUtils.getBeanReferenceByType(CdiUtils.java:230)
    at com.sun.faces.cdi.CdiUtils.getBeanReference(CdiUtils.java:213)
    at com.sun.faces.renderkit.html_basic.WebsocketRenderer.encodeEnd(WebsocketRenderer.java:111)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:949)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1912)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1908)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1908)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:491)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:194)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:151)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:126)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:223)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:671)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:412)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1385)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

我的调试器显示在CdiUtils上：230 beanManager为null我怀疑但无法确认FacedContext在CdiUtils上为null：213。我怀疑这是由于混淆同时拥有多个容器（Tomcat，CDI，Spring和JSF）。我喜欢Spring Security，RestTemplate和JdbcTemplate，所以我有点不愿意让Spring出现。这是我的Push bean。我把它的每一个注释扔到了它：

@Component
@Scope("Application")
public class PushBean implements Serializable {

    private static final long serialVersionUID = -6558314691176100417L;

    @Inject
    @Push(channel = "facilitatorBroadcastMessages")
    private PushContext push;

    private String facilitatorBroadcastMessage;

    public void setFacilitatorBroadcastMessage(String message) {
        this.facilitatorBroadcastMessage = message;
    }

    public void broadcastFacilitatorMessage() {
        push.send(facilitatorBroadcastMessage);
    }
}

发送消息的Facelet代码：

<p:button value="Send Broadcast Message to All Users" onclick="PF('broadcastMessageDialog').show(); " />
<p:dialog id="broadcastMessageDialog" header="Facilitator Message" widgetVar="broadcastMessageDialog" height="500px">
    <p:inputText id="facilitatorBroadcastMessageInput" value="#{pushBean.facilitatorBroadcastMessage}" />
    <p:commandButton onclick="PF('broadcastMessageDialog').hide(); " value="Send" process="@parent" action="#{pushBean.broadcastFacilitatorMessage()}" />
</p:dialog>

JS websocket listener：

function websocketListener(message, channel, event) {
    $("#facilitatorBroadcastMessage").innerHTML = message;
    PF('facilitatorBroadcastMessageDialog').show();
}

JSF websocket标签和用于显示消息的代码：

<f:websocket channel="facilitatorBroadcastMessages" onmessage="webSocketListener" />
<p:dialog id="facilitatorBroadcastMessageDialog" header="Facilitator Message" widgetVar="facilitatorBroadcastMessageDialog" height="500px">
    <p id="facilitatorBroadcastMessage"></p>
    <p:button onclick="PF('facilitatorBroadcastMessageDialog').hide(); " value="Got it, thanks!"/>
</p:dialog>

任何想法如何解决这个问题？

1 个答案:

答案 0 :(得分：0)

看看这个http://balusc.omnifaces.org/2013/10/how-to-install-cdi-in-tomcat.html。您需要安装Weld。

您需要执行以下三个步骤：

  1. 在webapp的/ WEB-INF / lib中删除weld-servlet-shaded.jar。如果你正在使用Maven，这是坐标：

    2. <dependency>
      <groupId>org.jboss.weld.servlet</groupId>
      <artifactId>weld-servlet-shaded</artifactId>
      <version>3.0.3.Final</version>
    </dependency>

    1. 在webapp的网页内容中创建/META-INF/context.xml文件，其中包含以下内容（或者，如果您已经有一个，只需添加条目）：

      2. <Context>
    <Resource name="BeanManager" 
        auth="Container"
        type="javax.enterprise.inject.spi.BeanManager"
        factory="org.jboss.weld.resources.ManagerObjectFactory" />
   </Context>

      这将在Tomcat的JNDI中注册Weld的BeanManager工厂。这不能由Weld以编程方式执行，因为Tomcat的JNDI是严格只读的。如果您的目标是至少Mojarra 2.2.11和/或OmniFaces 2.4或更新版本，则无需执行此步骤。两者都可以在ServletContext中找到它。但是，可能还有其他库仍希望在JNDI中找到BeanManager，那么最好保留这个配置文件。

      1. 创建一个（空）/WEB-INF/beans.xml文件（不，不在/ META-INF！中，仅用于内部JAR文件，如OmniFaces）。
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