Oracle UCP Throws "Connection Borrowing Returned Null" Exceptions

(Doc ID 1632130.1)

Last updated on APRIL 26, 2018

Applies to:

Universal Connection Pool - Version and later
Information in this document applies to any platform.


Using Oracle's Universal Connection Pool and getting the following kind of exceptions:

java.sql.SQLException: Exception occurred while getting connection: oracle.ucp.UniversalConnectionPoolException: Connection borrowing returned null
  at oracle.ucp.util.UCPErrorHandler.throwSQLException(
  at oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(
  at oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(
  at oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(

What could be the cause for this?


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