带有错误 java.lang.String 的 selectonemenu cannot be cast to javax.faces.model.SelectItem
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selectonemenu with the error java.lang.String cannot be cast to javax.faces.model.SelectItem
提问by rym
I want to fill a selectonemenu but always I have this error :
我想填写一个 selectonemenu 但我总是有这个错误：
java.lang.String cannot be cast to javax.faces.model.SelectItem
this is the code:
这是代码：
public class ToolsJIRA implements Serializable{
private String myChoicePeriod;
//getters and setters
}
JSF:
JSF：
<h:selectOneMenu value="#{ToolsJIRA.myChoicePeriod}">
<f:selectItem itemValue="Month" value="Month"/>
<f:selectItem itemValue="Week" value="Week"/>
<f:selectItem itemValue="Year" value="Year"/>
</h:selectOneMenu>
I have found that I should write a converter but I don't Know why? beacause I have seen some example work without a converter??
我发现我应该写一个转换器，但我不知道为什么？因为我看过一些没有转换器的示例工作？
thank you
谢谢你
采纳答案by Maddy
Try this code in in your webpage
在您的网页中尝试此代码
<h:selectOneMenu value="#{checkBoxBean.myChoicePeriod}">
<f:selectItem itemValue="Month" />
<f:selectItem itemValue="Week" />
<f:selectItem itemValue="Year" />
</h:selectOneMenu>
Do not use value attribute its inteded for different purpose
不要将 value 属性用于不同的目的
回答by Jigar Joshi
h:selectOneMenuas a valueaccepts collection of SelectItemand you passed Stringand so the Exception.
h:selectOneMenu作为一个value接受集合，SelectItem你通过了String，所以异常。
回答by Aditzu
The answer is "a little" late but probably the best solution is :
答案“有点”晚了，但最好的解决方案可能是：
<h:selectOneMenu value="#{ToolsJIRA.myChoicePeriod}">
<f:selectItem itemLabel="Month" itemValue="Month"/>
<f:selectItem itemLabel="Week" itemValue="Week"/>
<f:selectItem itemLabel="Year" itemValue="Year"/>
</h:selectOneMenu>
P.S. Although is a late answer I posted it for others who will face the same problem
PS虽然是一个迟到的答案，但我将其发布给将面临同样问题的其他人
