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EclipseLink: internal pool and external pool usage [message #1759644] Fri, 14 April 2017 12:33
Pavel No is currently offline Pavel NoFriend
Messages: 45
Registered: May 2016
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I develop non-JAVA EE application and I use EclipseLink with HSQLDB. From here

Quote:
For non-Java EE applications, you typically use internal connection pools. By default, EclipseLink sessions use internal connection pools.


Besides I don't configure connection pool in persistence.xml. However in org.eclipse.persistence.core.log I see the following:

TRACE | Connection acquired from connection pool [read].
TRACE | reconnecting to external connection pool
DEBUG | SELECT * FROM test
TRACE | Connection released to connection pool [read].


Please, note reconnecting to external connection pool. Why external? How to explain it?
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