java.lang.IllegalStateException是什么回事?

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java.lang.IllegalStateException是什么回事?
我这几天运行程序的时候总是出现以下运行结果,
java.lang.IllegalStateException
org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:423)
org.apache.jsp.chklogon_jsp._jspService(org.apache.jsp.chklogon_jsp:64)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

jdk5.0文档中很清楚地介绍了出现IllegalStateException异常的可能情况:
1）同一个页面中再次调用response.sendRedirect()方法.
2）提交的URL错误,即不是个有效的URL.
在response.sendRedirect()方法后加return语句即可,如下：
response.sendRedirect("login.jsp");
return;

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