java - Internal pool and external pool usage -


i develop non-java ee application. here

for non-java ee applications, typically use internal connection pools. default, eclipselink sessions use internal connection pools.

besides don't configure connection pool in persistence.xml. in org.eclipse.persistence.core.log see following:

trace | connection acquired connection pool [read]. trace | reconnecting external connection pool debug | select * test trace | connection released connection pool [read].

please, note reconnecting external connection pool. why external? how explain it?

i found out problem. in order make eclipselink use internal pool must set in persistence.xml

<property name="eclipselink.connection-pool.force-internal-pool" value="true"/>

hope save time.


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