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"oracle.ucp.UniversalConnectionPoolException: All connections in the Universal Connection Pool are in use" Error After Applying Patch 26337633 (Doc ID 2344789.1)

Last updated on MAY 31, 2023

Applies to:

JDBC - Version to [Release 12.1]
Information in this document applies to any platform.


After the UCP (Universal Connection Pool) was configured for a Tomcat application using JDBC and a face test was done, the system was put in production with the next errors reported in the logs:

WARN ] 2017-11-16 01:21:21,044 [POLICY_APP_SHARED_TIMER] org.hibernate.engine.jdbc.spi.SqlExceptionHelper - SQL Error: 29, SQLState: null
[ERROR] 2017-11-16 01:21:21,048 [POLICY_APP_SHARED_TIMER] org.hibernate.engine.jdbc.spi.SqlExceptionHelper - Exception occurred while getting connection: oracle.ucp.UniversalConnectionPoolException: All connections in the Universal Connection Pool are in use

The number of max connections was increased as an effort to resolve the issue, but there is the concern that the pool will continue to grow and hit the max level.


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