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私のバッキングBeanの1つでメソッドをプログラムで呼び出す/呼び出す必要があります。私はいくつかの例を見てきましたが、私が見ることから、これはうまくいくはずです。MethodExpression.invoke（）でメソッドが見つかりません
私のコード：。
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);
"data.getValueExpresssion（" 値」）でgetExpressionString（）は、文字列を返します。私は呼んでいる豆について
#{reports.customer}
情報を（はこれらが適切かどうかわかりません）：
クラスのマネージドBean名が "report"です： クラスはセッションスコープ内にある
クラスはSerializable
を私が呼んでいるメソッドのアクセス修飾子が
方法は、私が起動しようとしているメソッドのシグネチャではパラメータはありません
で実装します
public Result getCustomer() {
Result result = null;
try {
...perform database call
} catch (Exception e) {
log.error(e);
}
return result;
}
スタック・トレースの抜粋
SEVERE: javax.el.MethodNotFoundException: Method not found: [email protected]()
javax.faces.el.EvaluationException: javax.el.MethodNotFoundException: Method not found: [email protected]()
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: [email protected]()
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: [email protected]()
javax.faces.FacesException: #{reports.exportToExcel}: javax.el.MethodNotFoundException: Method not found: [email protected]()
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)
これに関するお手伝いがありますようお願い申し上げます。