javax.el.PropertyNotFoundException:在类型com.example.Bean上找不到属性'foo‘
javax.el.PropertyNotFoundException:在类型com.example.Bean上找不到属性'foo‘
提问于 2011-12-20 23:12:32
我有结果了
Query query = session.createQuery("From Pool as p left join fetch p.poolQuestion as s");查询，我想在JSP上显示它。
我有一个循环：
<c:forEach items="${pools}" var="pool">
<p>${pool.name}</p>
</c:forEach>我想显示poolQuestion表(这是Join表)的结果。我想要显示的值是‘答案’。
我该怎么做呢？
<c:forEach items="${pools}" var="pool">
<p>${pool.answer}</p>
<p>${pool.name}</p>
</c:forEach>上面的代码不起作用。
错误是：
org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/views/home.jsp at line 21
18: <c:forEach items="${pools}" var="pool">
19:
20: <p>${pool.name}</p>
21: <c:out value="${pool.poolQuestion.answer}"/>
22:
23: </c:forEach>
24:
SEVERE: Servlet.service() for servlet appServlet threw exception
javax.el.PropertyNotFoundException: Property 'answer' not found on type com.pool.app.domain.Pool
at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:214)
at javax.el.BeanELResolver$BeanProperties.access$400(BeanELResolver.java:191)
at javax.el.BeanELResolver.property(BeanELResolver.java:300)
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.home_jsp._jspx_meth_c_005fforEach_005f0(home_jsp.java:119)
at org.apache.jsp.WEB_002dINF.views.home_jsp._jspService(home_jsp.java:78)
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:250)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:669)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:574)
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 org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
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:291)
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$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:680)模型是：
public List<Pool> getAll(){
Session session = sessionFactory.getCurrentSession();
Query query = session.createQuery("From Pool as p left join fetch p.poolQuestions as s");
return query.list();控制器是：
List<Pool> pool = poolService.getAll();
model.addAttribute("pools", pool);视图是：
<c:forEach items="${pools}" var="pool">
<p>${pool.name}</p>
<c:out value="${pool.answer}"/>
</c:forEach>PS。${pool.name}显示正确
回答 4
Stack Overflow用户
发布于 2015-01-18 23:27:23
我认为id访问器与bean命名约定不匹配，这就是抛出异常的原因。它们应该如下所示：
public Integer getId() { return id; }
public void setId(Integer i){ id= i; }Stack Overflow用户
发布于 2020-05-12 23:58:10
检查forEach中的项目
<c:forEach items="${pools}" var="pool">
${pool.name}
</c:forEach>有时池“${items=}”有额外的空间，或者它的行为类似于字符串，重新键入它应该可以解决这个问题。
Stack Overflow用户
发布于 2018-08-19 07:38:21
EL按照描述解释${class.name} -假设您使用显式或隐式的方法生成getter/setter，则名称变为getName()
您可以通过显式地将名称标识为函数来覆盖此行为：${class.name()}这将直接调用函数名称()，而无需修改。
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原文链接：
https://stackoverflow.com/questions/8577545
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