+++ This bug was initially created as a clone of Bug #1258797 +++

Description of problem:

In BZ1161574, TransactionLockInterceptor is enabled by for SingletonRuntimeManager. But actually, with proper use of taskService (= take SynchronizedTaskService from Singleton RuntimeEngine), the "disconnected" issue will not happen. So "disabled" is the right default behaviour.

Steps to Reproduce:
1. Set DEBUG level log for org.drools.persistence.jta.TransactionLockInterceptor

<logger category="org.drools.persistence.jta.TransactionLockInterceptor">
<level name="DEBUG"/>
</logger>

2. Build&Deploy a project with a process which has a UserTask in business-central
3. Start a process. Complete a Task.
4. Look at server.log

Actual results:

You find TransactionLockInterceptor activities at DEBUG level.

19:02:12,404 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) About to register lock release handler by pool-19-thread-1
19:02:12,404 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) Error happened releasing directly by pool-19-thread-1 due to No transaction is running
19:02:12,404 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) Releasing on transaction completion by pool-19-thread-1
19:02:12,404 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) Successfully released lock by pool-19-thread-1
19:02:12,404 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) About to get a lock on command service by pool-19-thread-1
19:02:12,404 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) Lock taken by pool-19-thread-1
19:02:12,405 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) About to register lock release handler by pool-19-thread-1
19:02:12,405 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) Error happened releasing directly by pool-19-thread-1 due to No transaction is running
19:02:12,405 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) Releasing on transaction completion by pool-19-thread-1
19:02:12,405 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (pool-19-thread-1) Successfully released lock by pool-19-thread-1

Expected results:

You only see "Transaction lock interceptor enabled false" logs.

19:01:30,614 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (http-localhost.localdomain/127.0.0.1:8080-11) Transaction lock interceptor enabled false
19:01:30,615 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (http-localhost.localdomain/127.0.0.1:8080-11) Transaction lock interceptor enabled false
19:01:30,623 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (http-localhost.localdomain/127.0.0.1:8080-11) Transaction lock interceptor enabled false
19:01:30,634 DEBUG [org.drools.persistence.jta.TransactionLockInterceptor] (http-localhost.localdomain/127.0.0.1:8080-11) Transaction lock interceptor enabled false

— Additional comment from Toshiya Kobayashi on 2015-09-01 06:23:45 EDT —

It was enabled by commits in the comment https://bugzilla.redhat.com/show_bug.cgi?id=1161574#c5