OracleConnectionCacheImpl opens more connections than its max!

Hi there, I have an application that uses lots of connections... I have a pool of connections that I implement with the Oracle class: OracleConnectionCacheImpl. I set the maximum number of connections to 50, and for some reason, sometimes it reaches the 50 connections and ever more! It reached 60 connections at some point... So my question is, what are the reasons that a pool implemented with a OracleConnectionCacheImpl object reaches its maximum connections and more? How can I fix this?
Thanks!

It's probably a little bit too late to answer but it may serve someone else:
By default, when the maximum number of PooledConnection objects exists in the cache, and no free connection instance is available for a request, the cache will create another PooledConnection object, therefore exceeding the specified limit. Choosing a connection cache scheme can alter this behavior. There are three connection caching schemes available in the Oracle connection caching implementation.
�     Dynamic
�     Fixed Wait
�     Fixed with no Wait
The connection cache scheme is set using the setCacheScheme() method by passing in one of three constant values, DYNAMIC_SCHEME, FIXED_WAIT_SCHEME or FIXED_RETURN_NULL_SCHEME.

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