C3P0 一直有在更新，最新一次是节前 9月29日 提交的 0.9.2 Pre5 版本，下载地址：
http://sourceforge.net/projects/c3p0/files/c3p0-bin/c3p0-0.9.2-pre5/
改进记录：
c3p0-0.9.2-pre5
-- Some fixes of issues with per-user config overrides, verified and
updated docs with respect to per-user configs.
-- Unsynchronized access to identityToken in the various identityTokenized
beans, marking the property volatile instead. This should resolve an
occasional deadlock. Many thanks to Phillip Henry, see
https://sourceforge.net/tracker/?func=detail&atid=383690&aid=3552097&group_id=25357
-- Fixed a bug whereunder PoolBackedDataSources threw an Exception
trying to bind per-user overrides that properly should be bound
only to WrapperConnectionPoolDataSource (or to ComboPooledDataSource,
which wraps that). Many thanks to Walter Marcelo Pedrozo Barboza
for calling attention to this issue.
c3p0-0.9.2-pre4
-- Fixed broken version on Maven dependency to mchange-commons-java.
Version was hardcoded, now uses version number that c3p0 was built
against.
c3p0-0.9.2-pre3
-- Added workaround for bug in Maven 2.2.1 that sometimes leads to corruption
of deployed artifacts. See http://jira.codehaus.org/browse/MNG-4301
-- Eliminated bead RELEASE suffix from use in staging to Maven repository,
which should fix managed dependency problems for Maven users.
-- Required tests of PooledConnections to own the locks associated with those
PooledConnections in order to prevent occasional deadlocks when PooledConnection.close()
coincides with a Connection test. Many thanks to an anonymous SourceForge user for
calling attention to this issue.
C3P0是一个开放源代码的JDBC连接池，Hibernate的发行包中默认使用此连接池。据说性能最好。
详细的文档在C3P0的下载包中。本站提供最新版的C3P0文档，链接是：
http://www.ostools.net/apidocs/apidoc?api=c3p0
来自:开源中国社区
