No there is currently no way to do it.

The reason is because in general extra information is required before 
connections
can be constructed. This is the ManagedConnectionFactory's 
ConnectionRequestInfo,
whether there is a transaction and in some cases what is the user/password
of the EJB/servlet request.
This information is only provided when the application makes the first request.

e.g. For JMS you cannot know whether the pool should be filled Queue or Topic
connections.
e.g.2 For Oracle XA you need to know whether the connections will be used
inside or outside a transaction the <no-tx-separate-pool/> workaround.

The criteria I listed above are the special cases where it could in principle do
a prefill because it has enough information. 
BUT, it does not do this in the current implementation.

Additionally, with the default configuration, any prefilled connections would 
be closed
anyway after 15 minutes of non-use.

All the pooling parameters are listed here:
http://www.jboss.org/wiki/Wiki.jsp?page=ConfigJCACommon

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http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3856305#3856305

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