本文介绍了java.lang.IllegalArgumentException:未指定 bean的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
当我尝试提交表单时出现此错误.表单有两个字段，一个是空的，另一个有一些值.
I am getting this error when I try to submit form.Form has two field one is empty and another has some value.
java.lang.IllegalArgumentException: No bean specified
org.apache.commons.beanutils.PropertyUtilsBean.getPropertyDescriptor(PropertyUtilsBean.java:883)
org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:935)
org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:830)
org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:433)
org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493)
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:805)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
推荐答案
原来是 commons-beanutils api 已知问题 1.8.1，Upgrading commons-beanutils 到 1.9.1 解决了这个问题.
It turns out to be commons-beanutils api known issue at 1.8.1, Upgrading commons-beanutils to 1.9.1 resolved this issue.
BEANUTILS-345
BEANUTILS-345
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