当我添加此ActionListener时出现错误 [英] I get errors when i add this ActionListener

问题描述

我有以下代码：

 < h：commandButton type =submitaction =＃{clController.getPaymentByMonth （clController.type）}id =stateInfovalue =显示每月> 
 < / h：commandButton> 
  

当我添加< f：actionListener binding =此它给出以下错误：

 在com.sun.faces.facelets.el.TagValueExpression.getValue（TagValueExpression。的java：114）
。在com.sun.faces.facelets.tag.jsf.core.ActionListenerHandler $ LazyActionListener.processAction（ActionListenerHandler.java:112）
。在javax.faces.event.ActionEvent.processListener（ ActionEvent.java:88）在javax.faces.component.UIComponentBase.broadcast（UIComponentBase.java:769）
 
  

这是我的getTotal函数：

  List< CustomerPayment> total = null; 
 try {
 org.hibernate.Transaction tx = session.beginTransaction（）; 
 Query q = session.createQuery（SELECT SUM（amount）from CustomerPayment where DATE like'％+ year +'GROUP BY type） ; 
 total =（List< CustomerPayment>）q.list（）; 
} catch（Exception e）{
 e.printStackTrace（）; 
} 
 
 return totalDataTable = new ListDataModel（total）; 
  

可能是什么问题？

解决方案

问题出在 actionListener 的绑定属性的值上 - 它应指向一个实现 ActionListener 接口的对象 - 不是像你的情况那样调用方法。

JSF规范：
$ b

值绑定表达式，其值为实现javax.faces.event.ActionListener的对象。

I have below code:

 <h:commandButton type="submit" action="#{clController.getPaymentByMonth(clController.type)}"  id="stateInfo"  value="Show Monthly "  >
  <f:actionListener binding="#{clController.getTotal(clController.type)}" />
</h:commandButton>

When i add <f:actionListener binding=" this it gives below errors:

at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:114)
    at com.sun.faces.facelets.tag.jsf.core.ActionListenerHandler$LazyActionListener.processAction(ActionListenerHandler.java:112)
    at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
    at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:769)

This my getTotal function:

 List<CustomerPayment> total = null;
        try {
            org.hibernate.Transaction tx = session.beginTransaction();
            Query q = session.createQuery("SELECT SUM(amount) from CustomerPayment where DATE like '%"+year+"' GROUP BY type");
            total = (List<CustomerPayment>) q.list();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return totalDataTable = new ListDataModel(total);

What might be the problem?

解决方案

The problem is in the value of actionListener's binding attribute - it should point to an object implementing the ActionListener interface - not a method call as is in your case.

From the JSF spec:

Value binding expression that evaluates to an object that implements javax.faces.event.ActionListener.

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