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Server hangs and runs out of database connections



Server hangs and runs out of database connections after a few Business Intelligence Exchange (BIX) extraction processes. This occurs after installing the Business Intelligence Exchange (BIX) hotfixes of HFix-33295.jar, HFix-38109.jar and HFix-46693. The extraction retrieves a workitem through the Designer Studio. After a few iterations, the extraction does not complete. Designer Studio does not respond to the user interaction. However, the server nodes must be restarted to overcome the hang scenario. The system runs on the Tomcat against the Postgres database. The structure of workitem is complex with a number of nested pagelist and pagegroups. Thread Dump displays when the server hangs. Issue in obtaining the database connection.

Error Messages

at sun.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.park(
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(
at org.apache.tomcat.dbcp.pool2.impl.LinkedBlockingDeque.takeFirst(
at org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(
at org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(
at org.apache.tomcat.dbcp.dbcp2.PoolingDataSource.getConnection(
at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(

Steps to Reproduce

Run the Business Intelligence Exchange (BIX) extract multiple times on the Designer Studio.

Root Cause

A defect in Pegasystems’ code or rules. 


Apply HFix-49697.


Published May 22, 2019 - Updated October 8, 2020

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