Out Of Memory By Too Much T4CStatements (Doc ID 3015620.1)

Last updated on APRIL 09, 2024

Applies to:

Symptoms

While having an application running in Payara JEE Container, a scheduler starts a thread every 5 seconds that works through a two-column table and updates 1000 rows before terminating. The application uses Eclipse Link JPA implementation.
Using different database connection pools gives different results:
* Switching of Payara internal pooling and activating Oracle UCP pooling, the application is observed to run out of memory after 10 minutes
* Using Payara internal connection pooling the error takes longer to occur.

From a heap dump, 5 connections in UCP were seen, but only one has 90% of the memory allocated by holding a reference to 492362 T4CStatements.

Cause

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