对于我的项目，我想使用 jndi 为 oracle DB 使用 tomcat 连接池，并在执行以下代码时出现异常：
这是我得到的例外：
javax.naming.NameNotFoundException: Name java: is not bound in this Context
at org.apache.naming.NamingContext.lookup(NamingContext.java:803)
at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at com.iton.dbcp.DBUtil.getConnection(DBUtil.java:28)
at com.iton.dbcp.TestServlet.doGet(TestServlet.java:35)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFol
lowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:684)
at java.lang.Thread.run(Thread.java:662)
这些是我用于连接池的文件
我在 /conf/server.xml 中放置了以下配置：
<Resource name="jdbc/pooldb" auth="Container" type="javax.sql.DataSource"
maxActive="5" maxIdle="2" maxWait="1000" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:@localhost:1521:pooldb"/>
DBUtil1.java：
package com.iton.dbcp;
import java.sql.Connection;
import java.sql.SQLException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
public class DBUtil1 {
public static Connection getConnection() throws NamingException, SQLException {
Context initContext = new InitialContext();
Context envContext = (Context) initContext.lookup("java:/comp/env");
DataSource ds = null;
Connection conn = null;
try {
ds = (DataSource) envContext.lookup("jdbc/pooldb");
} catch (Exception e) {
e.printStackTrace();
}
if (envContext == null) {
System.out.println("envcontext is null");
}
if (ds == null) {
System.out.println("datasource is null");
}
if (ds != null){
conn = ds.getConnection("pooldb","pooldb");
}
return conn;
}
}
TestServlet.java：
package com.iton.dbcp;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class TestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public TestServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Connection con = null;
try {
con = DBUtil.getConnection();
System.out.println("opened conncetion:::::::::: "+con);
Statement stmt = con.createStatement();
stmt.executeUpdate("create table iton(sno varchar(10), name varchar(10))");
stmt.close();
DBUtil.closeConncetion(con);
System.out.println("Closeddddddddddddddd: "+con);
} catch (NamingException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
web.xml：http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> TestApp
<description>Oracle Test App</description>
<resource-ref>
<description>Oracle Datasource example</description>
<res-ref-name>jdbc/pooldb</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
<servlet>
<servlet-name>abscd</servlet-name>
<servlet-class>com.iton.dbcp.TestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>abscd</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
在 /conf/context.xml 中：
<!-- The contents of this file will be loaded for each web application -->
<Context>
<!-- Default set of monitored resources -->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<!-- Uncomment this to disable session persistence across Tomcat restarts -->
<!--
<Manager pathname="" />
-->
<ResourceLink global="jdbc/pooldb" name="jdbc/pooldb" type="javax.sql.DataSource"/>
</Context>
请解决这个问题