Question

我正在使用jsf 2和tomcat 6，我正在尝试执行此代码，该代码位于我拥有的.xhtml页面中：

    <h:dataTable value="${LogModel.getLogList()}" var="c"
            styleClass="order-table"
            headerClass="order-table-header"
            rowClasses="order-table-odd-row,order-table-even-row"
        >

我有类logmodel和方法getLogList（），但是当我启动页面时出现此错误：

/testLog.xhtml @ 20,8 value =“$ {LogModel.getLogList（）}”无法解析表达式[$ {LogModel.getLogList（）}]

以下是问题的完整日志：

javax.faces.view.facelets.TagAttributeException: /testLog.xhtml @20,8 value="${LogModel.getLogList()}" Failed to parse the expression [${LogModel.getLogList()}]
at com.sun.faces.facelets.tag.TagAttributeImpl.getValueExpression(TagAttributeImpl.java:401)
at com.sun.faces.facelets.tag.TagAttributeImpl.getValueExpression(TagAttributeImpl.java:351)
at com.sun.faces.facelets.tag.jsf.ComponentRule$ValueExpressionMetadata.applyMetadata(ComponentRule.java:107)
at com.sun.faces.facelets.tag.MetadataImpl.applyMetadata(MetadataImpl.java:81)
at javax.faces.view.facelets.MetaTagHandler.setAttributes(MetaTagHandler.java:129)
at javax.faces.view.facelets.DelegatingMetaTagHandler.setAttributes(DelegatingMetaTagHandler.java:102)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.doNewComponentActions(ComponentTagHandlerDelegateImpl.java:398)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:159)
at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:184)
at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93)
at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:86)
at com.sun.faces.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:152)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(FaceletViewHandlingStrategy.java:769)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:100)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
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.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.el.ELException: Failed to parse the expression [${LogModel.getLogList()}]
    at org.apache.el.lang.ExpressionBuilder.createNodeInternal(ExpressionBuilder.java:146)
    at org.apache.el.lang.ExpressionBuilder.build(ExpressionBuilder.java:172)
    at org.apache.el.lang.ExpressionBuilder.createValueExpression(ExpressionBuilder.java:216)
    at org.apache.el.ExpressionFactoryImpl.createValueExpression(ExpressionFactoryImpl.java:68)
    at com.sun.faces.facelets.tag.TagAttributeImpl.getValueExpression(TagAttributeImpl.java:385)
    ... 34 more
Caused by: org.apache.el.parser.ParseException: Encountered " "(" "( "" at line 1, column 22.
Was expecting one of:
    "}" ...
    "." ...
    "[" ...
    ">" ...
    "gt" ...
    "<" ...
    "lt" ...
    ">=" ...
    "ge" ...
    "<=" ...
    "le" ...
    "==" ...
    "eq" ...
"!=" ...
"ne" ...
"&&" ...
"and" ...
"||" ...
"or" ...
"*" ...
"+" ...
"-" ...
"/" ...
"div" ...
"%" ...
"mod" ...

at org.apache.el.parser.ELParser.generateParseException(ELParser.java:2142)
at org.apache.el.parser.ELParser.jj_consume_token(ELParser.java:2024)
at org.apache.el.parser.ELParser.DynamicExpression(ELParser.java:147)
at org.apache.el.parser.ELParser.CompositeExpression(ELParser.java:43)
at org.apache.el.lang.ExpressionBuilder.createNodeInternal(ExpressionBuilder.java:114)
... 38 more

非常感谢您的帮助！谢谢

Answer 1

仅支持EL语法${LogModel.getLogList()}，因为EL 2.2与Servlet 3.0一起使用。但是你使用的是旧的Tomcat 6服务器，它是一个Servlet 2.5容器，意味着EL 2.1。您需要使用正常的EL 2.1语法。

${LogModel.logList}

如果你真的坚持使用调用动作方法的新EL 2.2语法，那么你总是可以按照这个答案中描述的那样安装JBoss EL：Invoke direct methods or methods with arguments / variables / parameters in EL但是，这对于一个简单的getter方法是没有意义的然后通过更简单的EL语法访问。

初学者的一个主要误解是他们认为这个新的EL 2.2语法特定于JSF 2.0。但事实并非如此。造成这种混淆是因为EL 2.2和JSF 2.0都是Java EE 6的一部分，但JSF 2.0本身向后兼容Java EE 5（Servlet 2.5，EL 2.1等）。

Answer 2

1）它是#，而不是$

2）删除括号()和get。您正在使用属性，而不是方法（即使您需要在类中定义它们）。

3）最有可能的是，bean名称也必须以lowerCase开头（你正在访问一个对象，而不是一个类）。

value="#{logModel.logList}"

运行JSF页面错误：无法解析表达式[$ {LogModel.getLogList（）}]？

2 个答案: