本文探讨了在使用Struts框架处理HTML表单时遇到的填充ActionForm对象的问题。主要原因是表单字段与ActionForm属性类型不匹配或缺少适当的getter/setter方法。文章建议检查属性类型、确保使用字符串或布尔值，并验证所有属性都具有公共访问器和修改器。
at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:495)
[url]http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=58&t=008176[/url]
javax.servlet.ServletException: BeanUtils.populate org.apache.struts.util.RequestUtils.populate(RequestUtils.java:495) org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:804) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) root cause java.lang.reflect.InvocationTargetException sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) org.apache.commons.beanutils.PropertyUtilsBean.invokeMethod(PropertyUtilsBean.java:1773) org.apache.commons.beanutils.PropertyUtilsBean.setSimpleProperty(PropertyUtilsBean.java:1759) org.apache.commons.beanutils.PropertyUtilsBean.setNestedProperty(PropertyUtilsBean.java:1648) org.apache.commons.beanutils.PropertyUtilsBean.setProperty(PropertyUtilsBean.java:1677) org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:1022) org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811) org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298) org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493) org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:804) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
[b]You get this message when Struts is unable to map the data in the HTML form to the properties in your ActionForm bean. Make sure each of the properties on your bean is either a String or a boolean. Do you have any properties of type java.util.Date or other objects? That might cause this error. Also check to see that you have public getters and setter for each of your properties.[/b]
A property of type Integer could still cause this error. If you want to keep internal representation of the property as an Integer, that's fine, but change the setter so that it accepts a String, and then convert it to an Integer.
[url]http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=58&t=008176[/url]
javax.servlet.ServletException: BeanUtils.populate org.apache.struts.util.RequestUtils.populate(RequestUtils.java:495) org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:804) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802) root cause java.lang.reflect.InvocationTargetException sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) org.apache.commons.beanutils.PropertyUtilsBean.invokeMethod(PropertyUtilsBean.java:1773) org.apache.commons.beanutils.PropertyUtilsBean.setSimpleProperty(PropertyUtilsBean.java:1759) org.apache.commons.beanutils.PropertyUtilsBean.setNestedProperty(PropertyUtilsBean.java:1648) org.apache.commons.beanutils.PropertyUtilsBean.setProperty(PropertyUtilsBean.java:1677) org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:1022) org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811) org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298) org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493) org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:804) org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196) org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) javax.servlet.http.HttpServlet.service(HttpServlet.java:689) javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
[b]You get this message when Struts is unable to map the data in the HTML form to the properties in your ActionForm bean. Make sure each of the properties on your bean is either a String or a boolean. Do you have any properties of type java.util.Date or other objects? That might cause this error. Also check to see that you have public getters and setter for each of your properties.[/b]
A property of type Integer could still cause this error. If you want to keep internal representation of the property as an Integer, that's fine, but change the setter so that it accepts a String, and then convert it to an Integer.
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