Deadlocks using jBPM 3.2.2 with Oracle

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Issue

We are using jbpm-jpdl version 3.2.2 on oracle 10g. We are seeing infrequent locks in the JBPM_VARIABLEINSTANCE table. Please let us know how we can avoid this?
I am running JBPM 3.2.2 and have been seeing deadlocks when concurrently deleting process instances. The DB is Oracle 11g

Environment

jBPM 3.2.2
Oracle 10g/11g

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