[英]JSF Custom EL function works only on the first load of the page
我创建了一个(基于JSP的)自定义EL函数以在呈现的标记中使用。 该函数将返回一个布尔值,以确定是否需要在页面上呈现页面组件。 我使用<%@ taglib uri =“ /WEB-INF/mine.tld” prefix =“ g”%>将其导入到jsp页面中。
一切在jsp页面的第一次加载时都可以正常运行。 单击按钮后,提交表单,然后出现类似“找不到ClassLoaders的类:实现我的EL函数的类”和“找不到函数”之类的错误。 这里发生了什么? 有什么解决办法?
实现功能的类(com.util.WebContextLoader)在战争中作为实用程序类包括在内。
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
java.lang.ClassNotFoundException:找不到以下类的ClassLoader:com.util.WebContextLoader
函数类显然具有一个称为com.util.WebContextLoader
的依赖com.util.WebContextLoader
,该依赖com.util.WebContextLoader
在其直接类路径邻域中不可用。
这是间歇性发生的迹象,表明类路径被重复的类/库污染,该类/库散布在由不同类加载器加载的类路径上。 我将开始清理类路径。 摆脱JRE/lib
, JRE/lib/ext
和server/lib
中所有特定于Webapp的类/库。
我在这些线程中找到了解决此问题的方法。
http://community.jboss.org/message/46380
http://community.jboss.org/message/46385
解决方案是通过将以下依赖项添加到pom中,将jasper-el-6.0.18.jar放入战争的/ web-inf / lib文件夹中。
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 ),我们需要排除在外。
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