Tomcat连接池提示驱动错误

闪耀的光 发布于 2015/08/28 20:22
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tomcat中的server.xml
...
    <Resource name="jdbc/webdb2" auth="Container"
    type="javax.sql.DataSource"
    driverClassName="com.mysql.jdbc.Driver"
    url="jdbc:mysql://localhost:3306/webdb?characterEncoding=utf-8"
    username="root"
    password="sa123456"
    maxActive="200"
    maxIdle="50"
    maxWait="3000"
    />
...






tomcat中的webdemo3.xml
<Context path="/webdemo3" docBase="webdemo3" debug="0">
<ResourceLink name="jdbc/webdb2" global="jdbc/webdb2" type="javax.sql.DataSource"/>
</Context>






项目里的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>webdemo3</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <servlet-name>viewDictory</servlet-name>
    <servlet-class>webdemo3.chapter04.ViewDictionary</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>viewDictory</servlet-name>
    <url-pattern>/servlet/ViewDictionary</url-pattern>
  </servlet-mapping>
  <resource-ref>
    <description>DB Connection</description>
    <res-ref-name>jdbc/webdb2</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
  </resource-ref>
</web-app>






项目中的ViewDictionary.java
package webdemo3.chapter04;


import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * Servlet implementation class ViewDictionary
 */
public class ViewDictionary extends HttpServlet {
private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public ViewDictionary() {
        super();
        // TODO Auto-generated constructor stub
    }


/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out=response.getWriter();
try{
javax.naming.Context ctx=new javax.naming.InitialContext();
javax.sql.DataSource ds=(javax.sql.DataSource)ctx.lookup("java:/comp/env/jdbc/webdb2");
Connection conn=ds.getConnection();


PreparedStatement pstmt=conn.prepareStatement("select * from t_dictionary");

ResultSet rs=pstmt.executeQuery();

StringBuilder table=new StringBuilder();
table.append("<table border='1'>");
table.append("<tr><td>书名</td><td>价格</td></tr>");
while(rs.next()){
table.append("<tr><td>"+rs.getString("english")+"</td><td>"+rs.getString("chinese")+"</td></tr>");
}
table.append("</table>");
out.println(table.toString());
pstmt.close();
}catch(Exception e){
e.printStackTrace();
out.println(e.getMessage());
}
}


/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}


}






控制台错误信息:
java.sql.SQLException: Cannot create JDBC driver of class '' for connect URL 'null'
at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createConnectionFactory(BasicDataSource.java:2065)
at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:1939)
at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1412)
at webdemo3.chapter04.ViewDictionary.doGet(ViewDictionary.java:37)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1521)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1478)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getDriver(DriverManager.java:315)
at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createConnectionFactory(BasicDataSource.java:2049)
... 26 more






jar包好用,在项目和tomcat都有






还有个问题一直没有解决,不知道和这个有没有关:
conn=DriverManager.getConnection("jdbc:mysql://localhost:3360/newsmanager","root","sa123456");
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/newsmanager?user=root&password=sa123456");
第一个不好使 第二个好使 为什么




加载中
0
ajavaloser
ajavaloser

Caused by: java.sql.SQLException: No suitable driver 

把你mysql的驱动扔到lib下去

0
pantrick
pantrick
不要用tomcat自带的连接池,这个以前有这种bug,找不到驱动,不知道修复了没
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