Description of problem:

Migration from 6.x to 6.y would include database schema changes. Schema update is processed by Hibernate. But if a column is newly added to a table, the value will be 'null' when migrated.

Community installer includes upgrade-scripts to populate such columns.

https://github.com/droolsjbpm/jbpm/tree/master/jbpm-installer/db/upgrade-scripts

I think we need to include the scripts in our distribution (e.g. supplementary-tools) and let them involved in our QA migration test.

Steps to Reproduce:
1. Start a process instance with PerProcessInstanceRuntimeManager in BPMS 6.0.3. The process instance waits at a User Task.
2. Migrate the database to BPMS 6.1.0. (hibernate.hbm2ddl.auto=update)
3. Look at ContextMappingInfo table
4. Resume the process instance in BPMS 6.1.0

Actual results:

ContextMappingInfo.OWNER_ID is NULL.

mysql> select * from ContextMappingInfo;
-----------------------------------------------

-----------------------------------------------

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Get SessionNotFoundException when calling RuntimeEngine.getKieSession()

2015-06-22 09:56:25,738 ERROR [http-8080-7]
org.kie.internal.runtime.manager.SessionNotFoundException: No session found for context 1
at org.jbpm.runtime.manager.impl.PerProcessInstanceRuntimeManager$PerProcessInstanceInitializer.initKieSession(PerProcessInstanceRuntimeManager.java:442)
at org.jbpm.runtime.manager.impl.RuntimeEngineImpl.getKieSession(RuntimeEngineImpl.java:70)

Expected results:

A user run the update script after the step 2. Now OWNER_ID (and other columns) are populated.

RuntimeEngine.getKieSession() doesn't throw an Exception.