相关疑难解决方法(0)

我有一个数据表,每行有一个按钮:

<ice:dataTable ... var="item">
  <ice:column>
    <h:commandButton value="Download" action="#{mybean.downloadItem(item)}" />
  </ice:column>
</ice:dataTable>

在支持bean中有这种方法:

public void downloadItem(Item item) {
    // ...
}

一切正常(单击该方法时执行),但Eclipse验证失败并显示以下奇怪消息:

方法必须具有签名"String method(),String method(),String方法(String),String方法(String,String),String方法(String,String,String),String方法(String,String,String,String) ,String方法(String,String,String,String,String),String方法(String,String,String,String,String,String),String方法(String,String,String,String,String,String,String),String method(String,String,String,String,String,String,String,String),String方法(String,String,String,String,String,String,String,String,String),String方法(String,String,String, String,String,String,String,String,String,String),String方法(String,String,String,String,String,String,String,String,String,String,String),String方法(String,String,String, String,String,String,String,String,String,String,String,String),String method(String,String,String,String,String,String,String,String,String,String,String,String,String),String方法 tring,String,String,String,String,String,String,String,String,String,String,String,String,String),String method(String,String,String,String,String,String,String,String,String, String,String,String,String,String,String),String方法(String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String),String method(String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String,String),String method(String,String,String,String,String, String,String,String,String,String,String,String,String,String,String,String,String,String),String method(String,String,String,String,String,String,String,String,String,String, String,String,String,String,String,String,String,String,String)"但是有签名"void method()"

我能做什么？

如果这是相关的,我在Tomcat 7上使用Eclipse Indigo SR1.

Eclipse Facelet HTML Validator针对以下行报告错误"无法将表达式运算符应用于方法绑定":

<ui:fragment rendered="#{!empty managedBean.getSomething('ENUM_VALUE', someInt)}">

我在Juno帮助中找到了这个(我正在使用Kepler):

Applying operator to method binding
#{bean.action * 5}
If bean.action indicates a method "action()" on bean, then it is not legal EL to treat its result as a value. In the example, multiplying action by 5 attempts treat it is as a value.

我无法理解为什么将结果视为价值是不合法的？那么编写EL的正确方法是什么？谢谢!