com.ibm.bpe.util.ProcessAssertionError:
com.ibm.bpe.util.ProcessAssertionError:
Assertion Violation !(con!=null) in
method >> com.ibm.bpe.databse.StmtHelper.
prepareStmtUpdateTaskTemplateState
(StmtHelper.java:101)

If you see the following exception, ensure that your server (or deployment manager) can actually access the BPEDB. The connection object inside of the BPEL Database Statement Helper has become null for an unknown reason. You can go to the datasource for your BPEDB and click Test Connection. This will likely identify an exception as to why the server cannot connect.