Hibernate在Resin下部署多个c3p0数据源
环境：resin3.x
hibernate3
c3p0-0.9.1
单纯的使用hibernate，没有spring来配合，如果同一个resin下配置了多个c3p0连接池，则会报错，错误信息如下：
A C3P0Registry mbean is already registered. This probably means that an application using c3p0 was undeployed, but not all PooledDataSources were close
d prior to undeployment. This may lead to resource leaks over time. Please take care to close all PooledDataSources.
解决的方法是在hibernate的配置文件中给session-factory取各不相同的名称
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