我不知道这段代码有什么问题？它抛出 SQL异常：没有为jdbc找到合适的驱动程序：mysql：// localhost：3306 / test。
但我已经包含了jar文件 MySQL的连接器的Java-5.0.8-bin.jar
我试图通过数据源通过连接池建立连接。
我希望有人可以帮我解决这个问题。
如果有任何记录错误，请忽略我希望有人解决上面突出显示的连接错误
import java.sql.*;
import javax.annotation.Resource;
import javax.naming.*;
import javax.sql.*;
import org.apache.tomcat.dbcp.dbcp.ConnectionFactory;
import org.apache.tomcat.dbcp.dbcp.DriverManagerConnectionFactory;
import org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory;
import org.apache.tomcat.dbcp.dbcp.PoolingDataSource;
import org.apache.tomcat.dbcp.pool.impl.GenericObjectPool;
public class GetConnection {
/** Uses JNDI and Datasource (preferred style). */
@Resource(name = "jdbc/test")
DataSource ds;
static final String DRIVER = "com.mysql.jdbc.Driver";
static final String DATASOURCE_CONTEXT = "java:comp/env/jdbc/test";
private GenericObjectPool connectionPool = null;
public static final String URL = "jdbc:mysql://localhost:3306/test";
public static final String USERNAME = "root";
public static final String PASSWORD = "secret_password";
public GetConnection() {
System.out.println("enteredin to the new get connection");
/*try {
Context context = new InitialContext();
ds = (DataSource) context.lookup(DATASOURCE_CONTEXT);
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}*/
try {
ds = setUp();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public DataSource setUp() throws Exception {
Class.forName(GetConnection.DRIVER).newInstance();
connectionPool = new GenericObjectPool();
connectionPool.setMaxActive(10);
ConnectionFactory cf = new DriverManagerConnectionFactory(
GetConnection.URL, GetConnection.USERNAME,
GetConnection.PASSWORD);
PoolableConnectionFactory pcf = new PoolableConnectionFactory(cf,
connectionPool, null, null, false, true);
return new PoolingDataSource(connectionPool);
}
public GenericObjectPool getConnectionPool() {
return connectionPool;
}
/**
* Sets up the dataSource for the connection
*/
/**
* returns the connection object from the datasource
*
* @return the connection object
*/
public Connection getJNDIConnection() {
System.out.println("entered in to the get jndi connection");
System.out.println(ds);
System.out.println("checking the ds value");
Connection result = null;
try {
System.out.println("Inside try");
/*Context initialContext = new InitialContext();
this.ds = (DataSource) initialContext.lookup(DATASOURCE_CONTEXT);*/
if (ds != null) {
result = this.ds.getConnection();
System.out.println("connection done");
} else {
log("Failed to lookup datasource.");
System.out.println("connection not done");
}
} /*catch (NamingException ex) {
ex.printStackTrace();
System.out.println("naming excepti9on");
log("Cannot get connection: " + ex);
} */catch (SQLException ex) {
ex.printStackTrace();
System.out.println("sqlexception");
log("Cannot get connection: " + ex);
}
return result;
}
private static void log(Object aObject) {
System.out.println(aObject);
}
}
项目的上下文文件如下所示
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource name="jdbc/test" auth="Container" type="javax.sql.DataSource" username="root" password="secret_password" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/test;create=true" />
</Context>
堆栈跟踪在
之下java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/test
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.apache.tomcat.dbcp.dbcp.DriverManagerConnectionFactory.createConnection(DriverManagerConnectionFactory.java:75)
at org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582)
at org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1158)
at org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:106)
at com.new.connection.GetConnection.getJNDIConnection(GetConnection.java:81)
at com.new.daoclass.CreateUserAgreement.createUser(CreateUserAgreement.java:17)
at com.new.bean.useragreement.UserAgreementBean.createagreement(UserAgreementBean.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.el.parser.AstValue.invoke(AstValue.java:262)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:278)
at org.apache.myfaces.view.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:83)
at javax.faces.component._MethodExpressionToMethodBinding.invoke(_MethodExpressionToMethodBinding.java:88)
at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:100)
at javax.faces.component.UICommand.broadcast(UICommand.java:120)
at javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:937)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:271)
at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1249)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:675)
at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:34)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:171)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
答案 0 :(得分：0)
请将其放在${CATALINA_HOME}/lib目录中并重新启动服务器。这是因为您正在尝试访问池中的连接，该连接应由tomcat在配置数据源期间创建。所以，它需要mysql-driver.jar来配置数据源。所以，通过将它放在tomcat/lib中来提供它。您可以从此link下载。
答案 1 :(得分：0)
您尝试从应该由Tomcat创建的池中访问数据库连接。因此Tomcat需要在自己的类路径中使用JDBC驱动程序。将JDBC驱动程序添加到tomcat/lib目录。