oracle.ucp.UniversalConnectionPoolException: Connection borrowing returned null

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oracle.ucp.UniversalConnectionPoolException: Connection borrowing returned null
at oracle.ucp.util.UCPErrorHandler.newUniversalConnectionPoolException(UCPErrorHandler.java:368)
at oracle.ucp.util.UCPErrorHandler.throwUniversalConnectionPoolException(UCPErrorHandler.java:49)
at oracle.ucp.util.UCPErrorHandler.throwUniversalConnectionPoolException(UCPErrorHandler.java:80)
at oracle.ucp.util.UCPErrorHandler.throwUniversalConnectionPoolException(UCPErrorHandler.java:131)
at oracle.ucp.common.UniversalConnectionPoolImpl.borrowConnectionWithoutCountingRequests(UniversalConnectionPoolImpl.java:343)
at oracle.ucp.common.UniversalConnectionPoolImpl.borrowConnection(UniversalConnectionPoolImpl.java:142)
at com.oracle.oim.gcp.ucp.UCPPool.borrowConnectionFromPool(UCPPool.java:45)
at com.oracle.oim.gcp.pool.ConnectionService.getConnection(ConnectionService.java:49)
at oracle.iam.connectors.ebs.common.dao.DBUtil.(Unknown Source)
at oracle.iam.connectors.ebs.hrms.tasks.EmployeeReconciliationTask.initializeDBUtil(Unknown Source)
at oracle.iam.connectors.ebs.hrms.tasks.EmployeeReconciliationTask.init(Unknown Source)
at com.thortech.xl.scheduler.tasks.SchedulerBaseTask.execute(SchedulerBaseTask.java:382)
at oracle.iam.scheduler.vo.TaskSupport$1.processWithoutResult(TaskSupport.java:135)
at oracle.iam.platform.tx.OIMTransactionCallbackWithoutResult.process(OIMTransactionCallbackWithoutResult.java:9)
at oracle.iam.platform.tx.OIMTransactionCallback.doInTransaction(OIMTransactionCallback.java:13)
at oracle.iam.platform.tx.OIMTransactionCallback.doInTransaction(OIMTransactionCallback.java:6)
at oracle.iam.platform.tx.OIMTransactionManager.execute(OIMTransactionManager.java:22)
at oracle.iam.scheduler.vo.TaskSupport.executeJob(TaskSupport.java:116)
at sun.reflect.GeneratedMethodAccessor1055.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at oracle.iam.scheduler.impl.quartz.QuartzJob$TaskExecutionAction.run(QuartzJob.java:266)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.security.Security.runAs(Security.java:41)
at Thor.API.Security.LoginHandler.weblogicLoginSession.runAs(weblogicLoginSession.java:52)
at oracle.iam.scheduler.impl.quartz.QuartzJob.execute(QuartzJob.java:75)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)

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