#{notes.revise.fieldValues[v.count].textValue} throws javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation

【问题标题】：#{notes.revise.fieldValues[v.count].textValue} throws javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation#{notes.revise.fieldValues[v.count].textValue} throws javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation
【发布时间】：2016-02-06 23:59:09
【问题描述】：

我遇到一个错误，其中显示“javax.el.PropertyNotWritableException：Set Operation 的非法语法”。我怀疑这与我的 EL 表达式语法有关？

<p:inputText id="custom_${notes.key}_${v.count}"
   value="#{notes.revise.fieldValues[v.count].textValue}"
   maxlength="1000"
   styleClass="prop-custom-text" />

这是错误信息：

17:52:27,606 SEVERE [org.omnifaces.exceptionhandler.FullAjaxExceptionHandler] (default task-7) FullAjaxExceptionHandler: An exception occurred during processing JSF ajax request. Error page '/WEB-INF/error.xhtml' will be shown.: javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation
    at com.sun.el.parser.SimpleNode.setValue(SimpleNode.java:168) [javax.el-3.0.1-b05.jar:]
    at com.sun.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:294) [javax.el-3.0.1-b05.jar:]
    at org.jboss.weld.el.WeldValueExpression.setValue(WeldValueExpression.java:64) [weld-core-impl-2.2.6.Final.jar:2014-10-03 10:05]
    at org.jboss.weld.el.WeldValueExpression.setValue(WeldValueExpression.java:64) [weld-core-impl-2.2.6.Final.jar:2014-10-03 10:05]
    at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:131) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at javax.faces.component.UIInput.updateModel(UIInput.java:832) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIInput.processUpdates(UIInput.java:749) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1290) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1290) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIForm.processUpdates(UIForm.java:281) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:577) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at javax.faces.component.UIForm.visitTree(UIForm.java:381) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:266) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:60) [primefaces-5.1.jar:5.1]
    at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:1252) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:78) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:130) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at com.dialanote.servlet.NoCacheFilter.doFilter(NoCacheFilter.java:53) [classes:]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:85) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:63) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:56) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:247) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:76) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:166) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:759) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_79]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_79]
    at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_79]

【问题讨论】：

  • 你确定这是给定的 EL 表达式吗？它看起来不错，因为它不是只读表达式。此异常在#{foo ? bar : baz} 或#{foo.getBar()} 等只读表达式上很常见。但是你拥有的那个是绝对可写的。 MCVE 将有助于确定原因。另见stackoverflow.com/tags/jsf/info

标签： jsf el setter


【解决方案1】：

哎呀，我好像发现了我的错误！在这里贴代码的时候，为了方便阅读，稍微修改了一下，没想到这里已经修复了哈哈。

这是它最初的样子。罪魁祸首是EL表达式后面的空白。

<p:inputText 
   id="custom_${notes.key}_${v.count}" value="#{notes.revise.fieldValues[v.count].textValue} "
   maxlength="1000" styleClass="prop-custom-text" />

【讨论】：

    猜你喜欢
    • 1970-01-01
    • 2012-05-05
    • 2022-12-28
    • 1970-01-01
    • 2023-04-08
    • 1970-01-01
    • 1970-01-01
    • 2019-06-10
    • 1970-01-01
    相关资源
    最近更新 更多
    热门标签
    Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode