JDBC连接数据库,报了下面的错误,我已经把mysql-connector-java-5.1.41包加入build path中了啊

[6饼]

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.zyh.dao.ss.validateUser(ss.java:28)
at com.zyh.action.LoginCheck.doPost(LoginCheck.java:31)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)[/code]

[tianfang]

已经把mysql-connector-java-5.1.41包加入build path中了啊 不一定打进了war包，用winrar打开war包看看，mysql-connector-java-5.1.41是否在其中

[鱿鱼ing]

清tomcat缓存试试

[ryuugu_rena]

驱动找不到，少jar包

[JE_GE]

定义变量com.mysql.jdbc.Driver a; 如果报错，还是jar文件没有导入

[隐股经之火爆笛四弟子]

运行命令未包含jar包，java -Xmx5920M -Dfile.encoding=utf-8 -classpath "lib/mysql_jdbc.jar" -jar 【包名】

[???3126]

找不到驱动，缺少jar包，外部导包sqljdbc4.jar 然后再试试吧！

[隐股经之火爆笛四弟子]

编译java程序时需要将jdbc包加载打包到java程序jar或者war包中，而容器运行的jar包归容器运行使用，一般不能给在容器上面运行的java程序使用！