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POMethod not found exception on MethodExpression.invoke()
 

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  1. POMethod not found exception on MethodExpression.invoke()
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    <p>I have a need to programmatically call/invoke a method in one of my backing beans. I've looked at several examples, and from what I can see, this "should" work.</p> <p><strong>My code:</strong></p> <pre><code>UIData data = (UIData)component; fc = FacesContext.getCurrentInstance(); elc = fc.getELContext(); elFactory = fc.getApplication().getExpressionFactory(); mexp = elFactory.createMethodExpression(elc, data.getValueExpression("value").getExpressionString(), Result.class, new Class[]{}); Object methodResult = mexp.invoke(elc, null); </code></pre> <p>The "data.getValueExpresssion("value").getExpressionString() returns the string:</p> <pre><code>#{reports.customer} </code></pre> <p><strong>Info about the bean I'm calling</strong> (<em>don't know if these are relevant</em>):<br> Class's managed bean name is "report"<br> Class is in Session-scope<br> Class implements Serializable<br> The access modifier of the method I'm calling is<br> There are no parameters in the method signature </p> <p><strong>Method I'm trying to invoke:</strong></p> <pre><code>public Result getCustomer() { Result result = null; try { ...perform database call } catch (Exception e) { log.error(e); } return result; } </code></pre> <p><strong>Stack-Trace Excerpt</strong></p> <pre><code>SEVERE: javax.el.MethodNotFoundException: Method not found: com.npp.beans.reports.SharebackReportsBean@1ebf0d3.customer() javax.faces.el.EvaluationException: javax.el.MethodNotFoundException: Method not found: com.npp.beans.reports.SharebackReportsBean@1ebf0d3.customer() at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:98) at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:98) at javax.faces.component.UICommand.broadcast(UICommand.java:311) at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781) at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246) at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308) ... Caused by: javax.el.MethodNotFoundException: Method not found: com.npp.beans.reports.SharebackReportsBean@1ebf0d3.customer() at com.sun.el.util.ReflectionUtil.getMethod(ReflectionUtil.java:155) at com.sun.el.parser.AstValue.invoke(AstValue.java:231) at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297) at com.npp.business.TableToExcelManager.initExcelWorker(TableToExcelManager.java:247) at com.npp.beans.reports.SharebackReportsBean.exportToExcel(SharebackReportsBean.java:439) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.el.parser.AstValue.invoke(AstValue.java:234) at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297) at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:102) at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:84) ... 26 more Mar 23, 2011 11:29:34 AM com.sun.faces.lifecycle.InvokeApplicationPhase execute WARNING: #{reports.exportToExcel}: javax.el.MethodNotFoundException: Method not found: com.npp.beans.reports.SharebackReportsBean@1ebf0d3.customer() javax.faces.FacesException: #{reports.exportToExcel}: javax.el.MethodNotFoundException: Method not found: com.npp.beans.reports.SharebackReportsBean@1ebf0d3.customer() at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:114) at javax.faces.component.UICommand.broadcast(UICommand.java:311) at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781) at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246) at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) </code></pre> <p>Any help on this is greatly appreciated!</p>
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