Type 异常报告
消息 在 [23] 行处理 [/judge.jsp] 时发生异常
描述 服务器遇到一个意外的情况，阻止它完成请求。
Exception
org.apache.jasper.JasperException: 在 [23] 行处理 [/judge.jsp] 时发生异常
20: // out.print(u+" "+p);
21:
22: Class.forName("com.mysql.jdbc.Driver");
23: Connection ct = DriverManager.getConnection("jdbc:mysql://localhost:3306/chooseLesson","root","");
24: Statement st = ct.createStatement();
25: ResultSet rs = st.executeQuery("select * from info where username ='"+u+"'");
26: if(rs.next()){
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:626)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:500)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause
javax.servlet.ServletException: java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: NO)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:666)
org.apache.jsp.judge_jsp._jspService(judge_jsp.java:187)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: NO)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1094)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4226)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4158)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:926)
com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1748)
com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1288)
com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2508)
com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2541)
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2323)
com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:832)
com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:46)
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:417)
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677)
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
org.apache.jsp.judge_jsp._jspService(judge_jsp.java:150)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
):注意 主要问题的全部 stack 信息可以在 server logs 里查看