javax.servlet.ServletException: BeanUtils.populate

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: BeanUtils.populate
	org.apache.struts.util.RequestUtils.populate(RequestUtils.java:469)
	org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:818)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:194)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
	org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:112)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	com.lzb.web.filter.SetCodeFilter.doFilter(SetCodeFilter.java:25) 	

root cause

java.lang.IllegalArgumentException: argument type mismatch
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:606)
	org.apache.commons.beanutils.PropertyUtils.setSimpleProperty(PropertyUtils.java:1789)
	org.apache.commons.beanutils.PropertyUtils.setNestedProperty(PropertyUtils.java:1684)
	org.apache.commons.beanutils.PropertyUtils.setProperty(PropertyUtils.java:1713)
	org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:1019)
	org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:808)
	org.apache.struts.util.RequestUtils.populate(RequestUtils.java:467)
	org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:818)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:194)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
	org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:112)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	com.lzb.web.filter.SetCodeFilter.doFilter(SetCodeFilter.java:25)

	
原因：

1 ，可能是actionForm 中 封裝該屬性的類型不對。

2 ，我的錯誤原因是：在表單上傳文件的時候 在form表單中忘了添加enctype="multipart/form-data" (struts1)。