Websocket +漂亮的脸= AbstractMethodError

Question

我正在tomcat 8.5中构建一个简单的JSF 2.3应用程序。我使websocket正常工作，然后添加了Pretty Faces。

如果我单独使用它们，它们都可以工作。我的意思是，如果我从pom中删除了Pretty Faces的依赖项，那么我的websocket就会起作用。如果我保留依赖关系，并从视图中删除<f:websocket>，则Pretty Faces可以正常工作（重定向正常）！

但是，如果我尝试使用Pretty Faces，则在视图中有<f:websocket>时，导航到它时会显示AbstractMethodError。从字面上看，如果我评论标签，其他所有内容都可以。

我使用mojarra。在我的pom中，我使用https://github.com/javaserverfaces/mojarra/blob/master/README.md和the default ones中的相依相伴作为Pretty Faces。

我猜问题是我在this BalusC answer中读到的内容之间存在依赖关系冲突，或者“ Pretty Faces”和Websocket有所冲突。

任何帮助将不胜感激。预先感谢。

这里是依赖项

<!-- Java EE containers -->
<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-web-api</artifactId>
    <version>8.0</version>
    <scope>provided</scope>
</dependency>

<!-- Servlet Containers -->
<dependency>
    <groupId>org.glassfish</groupId>
    <artifactId>javax.faces</artifactId>
    <version>2.3.1</version>
</dependency>
<dependency>
    <groupId>org.jboss.weld.servlet</groupId>
    <artifactId>weld-servlet-shaded</artifactId>
    <version>3.0.0.Final</version>
</dependency>
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>
<dependency> <!-- Optional, only when <f:websocket> is used. -->
    <groupId>org.glassfish</groupId>
    <artifactId>javax.json</artifactId>
    <version>1.1</version>
</dependency>

<!-- Pretty Faces -->
<dependency>
    <groupId>org.ocpsoft.rewrite</groupId>
    <artifactId>rewrite-servlet</artifactId>
    <version>3.4.2.Final</version>
</dependency>
<dependency>
    <groupId>org.ocpsoft.rewrite</groupId>
    <artifactId>rewrite-config-prettyfaces</artifactId>
    <version>3.4.2.Final</version>
</dependency>

这里是例外

Nov 06, 2019 1:49:39 AM com.sun.faces.context.ExceptionHandlerImpl log
FATAL: JSF1073: java.lang.AbstractMethodError caught during processing of RENDER_RESPONSE 6 : UIComponent-ClientId=, Message=null
Nov 06, 2019 1:49:39 AM com.sun.faces.context.ExceptionHandlerImpl log
FATAL: No associated message
java.lang.AbstractMethodError
    at javax.faces.application.ViewHandlerWrapper.getWebsocketURL(ViewHandlerWrapper.java:328)
    at javax.faces.application.ViewHandlerWrapper.getWebsocketURL(ViewHandlerWrapper.java:328)
    at com.sun.faces.push.WebsocketChannelManager.register(WebsocketChannelManager.java:151)
    at com.sun.faces.push.WebsocketChannelManager.register(WebsocketChannelManager.java:142)
    at com.sun.faces.push.WebsocketChannelManager$Proxy$_$$_WeldClientProxy.register(Unknown Source)
    at com.sun.faces.renderkit.html_basic.WebsocketRenderer.encodeEnd(WebsocketRenderer.java:115)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:949)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1912)
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:918)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1905)
    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 org.ocpsoft.rewrite.faces.RewriteViewHandler.renderView(RewriteViewHandler.java:196)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:151)
    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:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:226)
    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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:470)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:395)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316)
    at org.ocpsoft.rewrite.servlet.impl.HttpRewriteResultHandler.handleResult(HttpRewriteResultHandler.java:42)
    at org.ocpsoft.rewrite.servlet.RewriteFilter.rewrite(RewriteFilter.java:297)
    at org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:198)
    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:493)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:660)
    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:798)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:808)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

Answer 1

看来PrettyFaces 3.4.2与JSF 2.3并不完全兼容。

非抽象类org.ocpsoft.rewrite.faces.RewriteViewHandler.RewriteViewHandler扩展了javax.faces.application.ViewHandler，但没有覆盖抽象方法getWebsocketURL。

您可以在类路径上使用漂亮的面孔和JSF 2.3 API轻松重现它：

package my.pkg;

import org.ocpsoft.rewrite.faces.RewriteViewHandler;

public class PrettyFacesTest {
    public static void main(String[] args) {
        new RewriteViewHandler(null).getWebsocketURL(null, null);
    }
}

结果：

Exception in thread "main" java.lang.AbstractMethodError: org.ocpsoft.rewrite.faces.RewriteViewHandler.getWebsocketURL(Ljavax/faces/context/FacesContext;Ljava/lang/String;)Ljava/lang/String;
    at my.pkg.PrettyFacesTest.main(PrettyFacesTest.java:7)

RewriteViewhandler已注册在rewrite-integration-faces-3.4.2.Final.jar/META-INF/faces-config.xml中：

<application>
    <navigation-handler>org.ocpsoft.rewrite.faces.RewriteNavigationHandler</navigation-handler>
    <view-handler>org.ocpsoft.rewrite.faces.RewriteViewHandler</view-handler>
</application>

我不确定是否有机会阻止此注册。如果是这样，您可以创建一个扩展CustomRewriteViewHandler的RewriteViewHandler，覆盖getWebsocketURL并委托调用super.parent的代理：

import javax.faces.application.ViewHandler;
import javax.faces.context.FacesContext;

import org.ocpsoft.rewrite.faces.RewriteViewHandler;

public class CustomRewriteViewHandler extends RewriteViewHandler {
    public CustomRewriteViewHandler(ViewHandler viewHandler) {
        super(viewHandler);
    }

    @Override
    public String getWebsocketURL(FacesContext context, String channel) {
        return super.parent.getWebsocketURL(context, channel);
    }
}

然后您将注册此CustomRewriteViewHandler而不是原始的：

<application>
    <navigation-handler>org.ocpsoft.rewrite.faces.RewriteNavigationHandler</navigation-handler>
    <view-handler>my.pkg.CustomRewriteViewHandler</view-handler>
</application>