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JavaWeb图书答疑

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happyboy_1544184024

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编译后点击注册，报错

发表在JavaWeb图书答疑 2018-12-19 《JavaWeb项目开发实战入门》第6章铭成在线考试系统

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HTTP Status 404 – Not Found

Type Status Report

Message /mrks/login/register.do

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Apache Tomcat/8.5.35

我直接复制光盘里的源代码，修改过数据库密码后，运行程序，然后点击注册，出现如上所示，该怎么处理故障。2.我输入数据库里初始的用户名密码后，出现用户名密码错误提示，怎么处理。

于2018-12-19 15:35:13编辑

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happyboy_1544184024

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2018-12-21

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happyboy_1544184024 发表于2018-12-21 14:38

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)

at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)

at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)

at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.base/java.lang.Thread.run(Thread.java:834)

null

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column '???' in 'field list'

at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)

at com.mysql.jdbc.Util.getInstance(Util.java:384)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4232)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4164)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)

at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2838)

at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)

at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2212)

at com.mrkj.ygl.service.SystemService.selectUserInfoBy用户名(SystemService.java:30)

at com.mrkj.ygl.servlet3.system.SystemLogin.doPost(SystemLogin.java:78)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at com.mrkj.ygl.filter.URLEncodeFilter.doFilter(URLEncodeFilter.java:25)