HTTP Status 500 是什么错误？

Question

后台处理错误了org.apache.jasper.JasperException: An exception occurred processing JSP page /login_in.jsp at line 109: String sid = request.getParameter("id");
10: int id = Integer.parseInt(sid);java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Integer.java:415)
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说明你的输入参数id可能为空或者不是数字

Answer 1

500 是服务器严重错误。看你的异常好像这个NumberFormatException数字格式化的时候异常了。
9: String sid = request.getParameter("id");
10: int id = Integer.parseInt(sid);
你的sid没有得到值，得到NULL,所以在转换成int的时候就异常了。

Answer 2

向当前这个页面跳转的URL后面缺少id参数和值。

Answer 3

我也遇到这样一个问题，求大神指导！HTTP Status 500 -type Exception reportmessagedescription The server encountered an internal error () that prevented it from fulfilling this request.exceptionorg.apache.jasper.JasperException: javax.servlet.ServletException: java.sql.SQLException: Invalid authorization specification,  message from server: "Access denied for user 'javatest'@'localhost' (using password: YES)"
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:532)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:440)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root causejavax.servlet.ServletException: java.sql.SQLException: Invalid authorization specification,  message from server: "Access denied for user 'javatest'@'localhost' (using password: YES)"
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:915)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:844)
org.apache.jsp.index_jsp._jspService(index_jsp.java:220)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root causejava.sql.SQLException: Invalid authorization specification,  message from server: "Access denied for user 'javatest'@'localhost' (using password: YES)"
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1977)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1900)
com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:2471)
com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:813)
com.mysql.jdbc.Connection.createNewIO(Connection.java:1771)
com.mysql.jdbc.Connection.<init>(Connection.java:440)
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:400)
java.sql.DriverManager.getConnection(Unknown Source)
java.sql.DriverManager.getConnection(Unknown Source)
org.logicalcobwebs.proxool.DefaultConnectionBuilder.buildConnection(DefaultConnectionBuilder.java:39)
org.logicalcobwebs.proxool.Prototyper.buildConnection(Prototyper.java:159)
org.logicalcobwebs.proxool.ConnectionPool.getConnection(ConnectionPool.java:217)
org.logicalcobwebs.proxool.ProxoolDriver.connect(ProxoolDriver.java:89)
java.sql.DriverManager.getConnection(Unknown Source)
java.sql.DriverManager.getConnection(Unknown Source)
wm.bean.DB.executeQuery(DB.java:23)
wm.bean.page.getCount(page.java:45)
wm.bean.page.myQuery(page.java:63)
org.apache.jsp.index_jsp._jspService(index_jsp.java:105)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.8 logs.Apache Tomcat/7.0.8