Created attachment 36920 [details]
Example JMX

Currently confirmed for Derby DB:

1. Create 2 JDBC Connections: first with autoCommit=true, other with autoCommit=false
2. Create 2 JDBC Samples with any statements (create table in example jmx file. change user_define_classpath property in the example)
3. While executing this test suite - exception occurs:

java.sql.SQLException: Cannot create PoolableConnectionFactory (Cannot close a connection while a transaction is still active.)


Commenting following line of code solves this issue:
org/apache/jmeter/protocol/jdbc/config/DataSourceElement.java:232
dataSource.setEnableAutoCommitOnReturn(false);

(This code was introduced in 3.3 version)


This behavior is hardcoded and there is no way no change this inside Jmeter.