I have results from
Query query = session.createQuery("From Pool as p left join fetch p.poolQuestion as s");
query and I would like to display it on JSP.
I have loop:
<c:forEach items="${pools}" var="pool">
<p>${pool.name}</p>
</c:forEach>
and I would like to display results from poolQuestion table (which is Join table). The value that i want to display is 'answer'.
How can I do it?
<c:forEach items="${pools}" var="pool">
<p>${pool.answer}</p>
<p>${pool.name}</p>
</c:forEach>
The above code doesn't works.
The error is:
org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/views/home.jsp at line 21
18: <c:forEach items="${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$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:680)
The model is:
public List<Pool> getAll(){
Session session = sessionFactory.getCurrentSession();
Query query = session.createQuery("From Pool as p left join fetch p.poolQuestions as s");
return query.list();
The controller is:
List<Pool> pool = poolService.getAll();
model.addAttribute("pools", pool);
And the View is:
<c:forEach items="${pools}" var="pool">
<p>${pool.name}</p>
<c:out value="${pool.answer}"/>
</c:forEach>
PS. the ${pool.name}
is displayed properly
javax.el.PropertyNotFoundException: Property 'foo' not found on type com.example.Bean
This literally means that the mentioned class com.example.Bean
doesn't have a public (non-static!) getter method for the mentioned property foo
. Note that the field itself is irrelevant here!
The public getter method name must start with get
, followed by the property name which is capitalized at only the first letter of the property name as in Foo
.
public Foo getFoo() {
return foo;
}
You thus need to make sure that there is a getter method matching exactly the property name, and that the method is public
(non-static
) and that the method does not take any arguments and that it returns non-void
. If you have one and it still doesn't work, then chances are that you were busy editing code forth and back without firmly cleaning the build, rebuilding the code and redeploying/restarting the application. You need to make sure that you have done so.
For boolean
(not Boolean
!) properties, the getter method name must start with is
instead of get
.
public boolean isFoo() {
return foo;
}
Regardless of the type, the presence of the foo
field itself is thus not relevant. It can have a different name, or be completely absent, or even be static
. All of below should still be accessible by ${bean.foo}
.
public Foo getFoo() {
return bar;
}
public Foo getFoo() {
return new Foo("foo");
}
public Foo getFoo() {
return FOO_CONSTANT;
}
You see, the field is not what counts, but the getter method itself. Note that the property name itself should not be capitalized in EL. In other words, ${bean.Foo}
won't ever work, it should be ${bean.foo}
.