Exception [TOPLINK-4002] : oracle.toplink.exceptions.DatabaseException Internal Exception: java.sql.SQLException: Internal error: Cannot obtain XAConnection

Error:
Exception [TOPLINK-4002] (Oracle TopLink - 11g Release 1 (11.1.1.1.0) (Build
090304)): oracle.toplink.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Internal error: Cannot obtain
XAConnection weblogic.common.resourcepool.ResourceDeadException: Pool
SOADataSource has been disabled because of hanging connection tests, cannot allocate resources to applications

Root Cause:
Resource pool max test wait sec are less than Database response time.

Resolution:
1. Open the $DOMAIN_HOME/bin/setSOADomainEnv.cmd file.
2. Uncomment the lines shown in bold,
# connections are slow. See SOA documentation for more details.
EXTRA_JAVA_PROPERTIES="${EXTRA_JAVA_PROPERTIES}
-Dweblogic.resourcepool.max_test_wait_secs=30"
export EXTRA_JAVA_PROPERTIES
3. Save your changes and restart server.