<分区>
我正在尝试在 Register servlet 中连接我的数据库类，但出现以下错误。我已经按如下方式导入了 mysql jar:
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver in Eclipse
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
数据库类:
package org.model;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class Database {
Connection con;
public void connect() throws Exception {
if (con != null)
return;
try {
//The error is here.
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
String url = "jdbc:mysql://localhost:3306/validationdata";
con = DriverManager.getConnection(url, "root", "");
System.out.println("It woks :)");
}
}
错误跟踪
Mai 29, 2016 6:57:57 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNUNG: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Validation' did not find a matching property.
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Server version: Apache Tomcat/7.0.69
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Server built: Apr 11 2016 07:57:09 UTC
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Server number: 7.0.69.0
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: OS Name: Windows 8.1
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: OS Version: 6.3
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Architecture: amd64
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Java Home: C:\Program Files\Java\jre1.8.0_74
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: JVM Version: 1.8.0_74-b02
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: JVM Vendor: Oracle Corporation
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: CATALINA_BASE: G:\eclipse_workspace\Java_JSP_JDBC\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: CATALINA_HOME: C:\Program Files\Apache Software Foundation\Tomcat 7.0
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Command line argument: -Dcatalina.base=G:\eclipse_workspace\Java_JSP_JDBC\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Command line argument: -Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 7.0
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Command line argument: -Dwtp.deploy=G:\eclipse_workspace\Java_JSP_JDBC\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Command line argument: -Djava.endorsed.dirs=C:\Program Files\Apache Software Foundation\Tomcat 7.0\endorsed
Mai 29, 2016 6:57:57 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMATION: Command line argument: -Dfile.encoding=Cp1252
Mai 29, 2016 6:57:57 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFORMATION: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre1.8.0_74\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre1.8.0_74/bin/server;C:/Program Files/Java/jre1.8.0_74/bin;C:/Program Files/Java/jre1.8.0_74/lib/amd64;C:\xampp\ImageMagick-7.0.1-Q16;C:\Program Files\ImageMagick-7.0.1-Q16;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Skype\Phone\;C:\Program Files\MiKTeX 2.9\miktex\bin\x64\;;G:\eclipse\eclipse for dynamic web\eclipse;;.
Mai 29, 2016 6:57:58 PM org.apache.coyote.AbstractProtocol init
INFORMATION: Initializing ProtocolHandler ["http-bio-8082"]
Mai 29, 2016 6:57:58 PM org.apache.coyote.AbstractProtocol init
INFORMATION: Initializing ProtocolHandler ["ajp-bio-8009"]
Mai 29, 2016 6:57:58 PM org.apache.catalina.startup.Catalina load
INFORMATION: Initialization processed in 1070 ms
Mai 29, 2016 6:57:58 PM org.apache.catalina.core.StandardService startInternal
INFORMATION: Starting service Catalina
Mai 29, 2016 6:57:58 PM org.apache.catalina.core.StandardEngine startInternal
INFORMATION: Starting Servlet Engine: Apache Tomcat/7.0.69
Mai 29, 2016 6:57:59 PM org.apache.coyote.AbstractProtocol start
INFORMATION: Starting ProtocolHandler ["http-bio-8082"]
Mai 29, 2016 6:57:59 PM org.apache.coyote.AbstractProtocol start
INFORMATION: Starting ProtocolHandler ["ajp-bio-8009"]
Mai 29, 2016 6:57:59 PM org.apache.catalina.startup.Catalina start
INFORMATION: Server startup in 1508 ms
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1858)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1701)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.model.Database.connect(Database.java:15)
at Register.doPost(Register.java:26)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/validationdata
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.model.Database.connect(Database.java:21)
at Register.doPost(Register.java:26)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
图片
