java.lang.IllegalArgumentException：参数类型不匹配
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java.lang.IllegalArgumentException: argument type mismatch
提问by Bhaskar
I want to populate a list of strings from a form.
我想从表单中填充字符串列表。
My form bean:
我的形式豆：
public class TaskForm extends ActionForm{
List<String> task = new ArrayList<String>();
public List<String> getTask() {
return task;
}
public void setTask(List<String> task) {
this.task=task;
}
}
My jsp:
我的jsp：
while (it.hasNext()) {
<textarea class="SubTaskTextArea_Style" id="task" name="task"></textarea></td>
}
strutsconfig:
支柱配置：
<form-beans>
<form-bean name="TaskForm" type="controller.form.TaskForm" />
</form-beans>
<action-mappings>
<action path="/TaskAction" type="task.action.TaskAction" name="TaskForm">
</action-mappings>
The situation is the textareacan be in any number, I want to get the string in textarea to be populated to the formbean.
情况是textarea可以是任意数字，我想将 textarea 中的字符串填充到formbean.
But it gives the following error:
但它给出了以下错误：
javax.servlet.ServletException: BeanUtils.populate
org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1099)
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:798)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:254)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1422)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:523)
javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.commons.beanutils.PropertyUtils.setSimpleProperty(PropertyUtils.java:1789)
at org.apache.commons.beanutils.PropertyUtils.setNestedProperty(PropertyUtils.java:1684)
at org.apache.commons.beanutils.PropertyUtils.setProperty(PropertyUtils.java:1713)
at org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:924)
at org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:729)
at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1097)
at org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:798)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:254)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1422)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:523)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Anybody have any idea?
有人有什么想法吗？
采纳答案by roger_that
Probably the way you are trying to show the values is not correct. Try something like this:
您尝试显示值的方式可能不正确。尝试这样的事情：
<s:iterator value="task">
<textarea><s:property /></textarea>
</s:iterator>
Would like to know how you want to display the list items ?
想知道您想如何显示列表项？
EDIT:
编辑：
Here it goes:
它是这样的：
<%int i = 0; %>
<s:iterator value="task">
<input type = "text" name = "t<%=i++%>" value="<s:property/>">
</s:iterator>
Whatever values would be entered in the text fields so created, will automatically be populated in the list task
无论在如此创建的文本字段中输入什么值，都将自动填充到列表任务中
