使用c3p0连接池的问题

Question

为什么我在Junit单元测试里用c3p0连接数据库是成功的，但在另一个实现类里就获取不到数据库的资源，这两个的代码都一样啊在同一个项目里，c3p0的配置文件也相同，为什么会出错？？？？？？？？？？？？

Answer 1

jdbcurl写错了，认真比较吧

Answer 2

你看我的这个断点调试，一执行到dbutils的那个query就报错，前面数据库的连接已经连接上了

Answer 3

可能xml文件的dataSource没有加载c3p0.properties里面的参数，你直接写死试试

Answer 4

我又用原始的Connection和statement调试，结果还是有错，不是Dbutils的问题，问题就在数据库上的连接，可是为什么我的单元测试就没有任何问题呢

Answer 5

 java.lang.NullPointerException
at com.mysql.fabric.jdbc.FabricMySQLDriver.parseFabricURL(FabricMySQLDriver.java:97)
at com.mysql.fabric.jdbc.FabricMySQLDriver.acceptsURL(FabricMySQLDriver.java:93)
at java.sql.DriverManager.getDriver(DriverManager.java:299)
at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:240)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:131)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:156)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:145)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:200)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1086)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1073)
at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1810)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:648)这是服务器报错的信息唉真愁人这个错怎么都改不了