这是一个小的java web程序，报错 200
<html><head><title>ApacheTomcat/7.0.70-Errorreport</title><style><!--H1{font-family:T...
<html><head><title>Apache Tomcat/7.0.70 - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - null</h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u>null</u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Integer.java:454)
java.lang.Integer.parseInt(Integer.java:527)
com.java1234.Web.GradeListServlet.doPost(GradeListServlet.java:37)
com.java1234.Web.GradeListServlet.doGet(GradeListServlet.java:28)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
</pre></p><p><b>note</b> <u>The full stack trace of the root cause is available in the Apache Tomcat/7.0.70 logs.</u></p><HR size="1" noshade="noshade"><h3>Apache Tomcat/7.0.70</h3></body></html> 展开
java.lang.Integer.parseInt(Integer.java:454)
java.lang.Integer.parseInt(Integer.java:527)
com.java1234.Web.GradeListServlet.doPost(GradeListServlet.java:37)
com.java1234.Web.GradeListServlet.doGet(GradeListServlet.java:28)
javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
</pre></p><p><b>note</b> <u>The full stack trace of the root cause is available in the Apache Tomcat/7.0.70 logs.</u></p><HR size="1" noshade="noshade"><h3>Apache Tomcat/7.0.70</h3></body></html> 展开
展开全部
or:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - null</h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>mes有错误
追问
那怎么解决啊
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