java - 从 Tomcat 中转换 JDBC JNDI 数据源 - ComboPooledDataSource

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它。

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"
   

   />

2. 查找

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

这导致了莫名其妙

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，也许它也很适合你，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");