JSF Custom EL功能仅适用于页面的第一次加载

时间：2010-04-23 15:00:15

标签： jsf function jboss el

我创建了一个（基于JSP的）自定义EL函数，用于渲染标记。该函数将返回一个布尔值，以决定是否需要在页面上呈现页面组件。 我使用＆lt;％@ taglib uri =“/ WEB-INF /mine.tld”prefix =“g”％＆gt;将其导入jsp页面。

在第一次加载jsp页面时，一切都很完美。单击一个按钮后，表单会提交，然后我收到错误，例如“找不到ClassLoaders：实现我的EL函数的类”和“找不到函数”。这里发生了什么？什么是修复？

实现该函数的类（com.util.WebContextLoader）作为实用程序类包含在战争中。

下面是堆栈跟踪。

09:22:31,112 ERROR [STDERR] java.lang.ClassNotFoundException: No ClassLoaders found for: com.util.WebContextLoader
09:22:31,112 ERROR [STDERR]     at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212)
09:22:31,112 ERROR [STDERR]     at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:521)
09:22:31,112 ERROR [STDERR]     at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
09:22:31,112 ERROR [STDERR]     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
09:22:31,112 ERROR [STDERR]     at java.lang.Class.forName0(Native Method)
09:22:31,112 ERROR [STDERR]     at java.lang.Class.forName(Class.java:169)
09:22:31,112 ERROR [STDERR]     at org.apache.el.lang.FunctionMapperImpl$Function.getMethod(FunctionMapperImpl.java:147)
09:22:31,112 ERROR [STDERR]     at org.apache.el.lang.FunctionMapperImpl.resolveFunction(FunctionMapperImpl.java:53)
09:22:31,112 ERROR [STDERR]     at org.apache.el.parser.AstFunction.getValue(AstFunction.java:71)
09:22:31,112 ERROR [STDERR]     at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
09:22:31,112 ERROR [STDERR]     at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:101)
09:22:31,112 ERROR [STDERR]     at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:390)
09:22:31,112 ERROR [STDERR]     at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1018)
09:22:31,112 ERROR [STDERR]     at javax.faces.component.UIForm.processDecodes(UIForm.java:209)
09:22:31,112 ERROR [STDERR]     at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1026)
09:22:31,112 ERROR [STDERR]     at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:540)
09:22:31,112 ERROR [STDERR]     at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78)
09:22:31,112 ERROR [STDERR]     at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
09:22:31,112 ERROR [STDERR]     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
09:22:31,112 ERROR [STDERR]     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:22:31,112 ERROR [STDERR]     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
09:22:31,112 ERROR [STDERR]     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
09:22:31,112 ERROR [STDERR]     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
09:22:31,112 ERROR [STDERR]     at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:420)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
09:22:31,112 ERROR [STDERR]     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
09:22:31,112 ERROR [STDERR]     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
09:22:31,112 ERROR [STDERR]     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
09:22:31,112 ERROR [STDERR]     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
09:22:31,112 ERROR [STDERR]     at java.lang.Thread.run(Thread.java:619)


09:22:31,112 WARN  [lifecycle] org.apache.jasper.el.JspELException: /register.jsp(45,2) '#{g:displayPageComponent('registrationPage', 'regUnit')}' Function 'g:displayPageComponent' not found
javax.faces.FacesException: org.apache.jasper.el.JspELException: /register.jsp(45,2) '#{g:displayPageComponent('registrationPage', 'regUnit')}' Function 'g:displayPageComponent' not found
    at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:393)
    at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1018)
    at javax.faces.component.UIForm.processDecodes(UIForm.java:209)
    at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1026)
    at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:540)
    at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
    at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:420)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
    at java.lang.Thread.run(Thread.java:619)
Caused by: org.apache.jasper.el.JspELException: /register.jsp(45,2) '#{g:displayPageComponent('registrationPage', 'regUnit')}' Function 'g:displayPageComponent' not found
    at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:107)
    at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:390)
    ... 34 more

2 个答案:

答案 0 :(得分：0)

  

java.lang.ClassNotFoundException：找不到ClassLoaders：com.util.WebContextLoader

函数类显然有一个名为com.util.WebContextLoader的依赖项，它在其直接类路径邻域中不可用。

间歇性地发生这种情况表明类路径被重复的类/库污染，这些类/库遍布由不同类加载器加载的类路径。我开始清理类路径。摆脱JRE/lib，JRE/lib/ext和server/lib中所有特定于webapp的类/库。

答案 1 :(得分：0)

我在这些主题中找到了解决这个问题的方法。

http://community.jboss.org/message/46380

http://community.jboss.org/message/46385

解决方法是将jasper-el-6.0.18.jar放入war的/ web-inf / lib文件夹中，方法是将以下依赖项添加到pom中。

 org.apache.tomcat  碧玉-EL  6.0.18  

此依赖项还将包括“el-api-6.0.18.jar”（请参阅​​http://repo1.maven.org/maven2/org/apache/tomcat/jasper-el/6.0.18/jasper-el-6.0.18.pom），我们需要将其排除在外。

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