javax.el.PropertyNotFoundException：属性 'foo' 在 java.lang.Boolean 类型上不可读
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【中文标题】javax.el.PropertyNotFoundException：属性 \'foo\' 在 java.lang.Boolean 类型上不可读【英文标题】：javax.el.PropertyNotFoundException: Property 'foo' not readable on type java.lang.Booleanjavax.el.PropertyNotFoundException：属性 'foo' 在 java.lang.Boolean 类型上不可读 【发布时间】：2012-12-06 19:40:21 【问题描述】：我有一个看起来像这样的类：
public class ScoreDefinition
protected Boolean primary;
public Boolean isPrimary()
return primary;
public void setPrimary(Boolean value)
this.primary = value;
我正在尝试像这样在 EL 中访问其 primary 属性：
<c:forEach var="score" items="$scores">
<input type="checkbox"
value="$score.primary"
name="someName"
class="textField"/>
</c:forEach>
但我得到了例外：
javax.el.PropertyNotFoundException: Property 'primary' not readable on type java.lang.Boolean
at javax.el.BeanELResolver$BeanProperty.read(BeanELResolver.java:280)
at javax.el.BeanELResolver$BeanProperty.access$000(BeanELResolver.java:230)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:81)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
at org.apache.el.parser.AstValue.getValue(AstValue.java:123)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:938)
at org.apache.jsp.WEB_002dINF.views.administer.projectBlocks_jsp._jspx_meth_c_005fforEach_005f2(projectBlocks_jsp.java:806)
at org.apache.jsp.WEB_002dINF.views.administer.projectBlocks_jsp._jspx_meth_c_005fif_005f2(projectBlocks_jsp.java:709)
at org.apache.jsp.WEB_002dINF.views.administer.projectBlocks_jsp._jspx_meth_form_005fform_005f0(projectBlocks_jsp.java:245)
at org.apache.jsp.WEB_002dINF.views.administer.projectBlocks_jsp._jspService(projectBlocks_jsp.java:150)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.groupgti.webclient.filter.SecurityFilter.doFilter(SecurityFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.groupgti.webclient.filter.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:43)
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: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$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
我无法更改此类，因为它是从 WSDL 文件生成的。所以问题是如何解决这个问题，而不使用任何自定义 EL 函数将 Boolean 转换为 String 或不将此对象转换为我的对象？是否可以在不进行任何其他修改的情况下以某种方式在 EL 中读取此属性？
【问题讨论】：
【参考方案1】：is 前缀仅适用于 boolean，不适用于 Boolean。
你有两个选择：
使用boolean 代替Boolean。
或者，将方法 isPrimary() 重命名为 getPrimary()。
至于自动生成错误方法的JAXB blunder，您需要至少升级到JAXB 2.1.13 或按照JAXB documentation 将-B-enableIntrospection 添加到wsimport 调用中。
另见：
JavaBeans specification - Chapter 8.3.2 How does Java expression language resolve boolean attributes? (in JSF 1.2) JSF 2 checkboxes and boolean getters【讨论】：
不能重命名，类是自动生成的，改不了。那么这是否意味着我必须围绕自己进行一些工作？ 你能添加你自己的方法吗？ 我不做 Spring，但如果我猜对了，是 JAXB 做了自动生成，请参阅更新的答案。 是的，这是 JAXB 生成的。好的，我会添加这个。谢谢。【参考方案2】：您可以像这样直接调用 score.isPrimary() 方法：
<c:forEach var="score" items="$scores">
<input type="checkbox"
value="$score.isPrimary()"
name="someName"
class="textField"/>
</c:forEach>
【讨论】：
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