从Tomcat - ComboPooledDataSource转换JDBC JNDI数据源

Question

有人可以让我摆脱痛苦，并解释为什么会发生这种情况以及如何解决这个问题。

1. 一个tomcat数据源

   <Resource name="MY_JDBC_NAME" auth="Container"
     driverClass="oracle.jdbc.OracleDriver"
     jdbcUrl="MyURL"
     user="MyUser"
     password="MyPassword"                                                     
     factory="org.apache.naming.factory.BeanFactory"
     type="com.mchange.v2.c3p0.ComboPooledDataSource"
     maxPoolSize="25"   
     minPoolSize="5"
     acquireIncrement="1"
     acquireRetryAttempts = "2"
     idleConnectionTestPeriod = "60"
     testConnectionOnCheckout = "true"
     preferredTestQuery = "SELECT 1 FROM DUAL"
   

   /＆GT;

2. 查询

   ComboPooledDataSource ds = (ComboPooledDataSource) ctx.lookup(     "java:comp/env/MY_JNDI_NAME");
   

这导致令人困惑的

java.lang.ClassCastException: com.mchange.v2.c3p0.ComboPooledDataSource cannot be cast to com.mchange.v2.c3p0.ComboPooledDataSource

提前致谢

Answer 1

我正在使用这个， 可能它也适合你，试试这个，

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;

...

Context initContext = new InitialContext();
Context envContext = (Context) initContext.lookup("java:comp/env");
DataSource ds = (DataSource) envContext.lookup("MY_JDBC_NAME");