Tomcat server won't start

Hello, I need some help.
I would like to connect to a Oracle Database with bonita bpm Community.

What I did was this:
http://documentation.bonitasoft.com/database-configuration-1

I followed these steps:
--> set DB_OPTS="-Dsysprop.bonita.db.vendor=oracle" to oracle in the setenv.sh
--> was commenting out

in the server.xml
--> commenting this out :

H2 example resource.ds1.className=org.h2.jdbcx.JdbcDataSource resource.ds1.driverProperties.user=sa resource.ds1.driverProperties.password= resource.ds1.driverProperties.URL=jdbc:h2:tcp://localhost:9091/bonita_journal.db;MVCC=TRUE;DB_CLOSE_ON_EXIT=TRUE;IGNORECASE=TRUE; resource.ds1.testQuery=SELECT 1

and set this insetad :

Oracle example

resource.ds1.className=oracle.jdbc.xa.client.OracleXADataSource
resource.ds1.driverProperties.user=user
resource.ds1.driverProperties.password=pw
resource.ds1.driverProperties.URL=jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=dbsrv01.desy.de)(PORT=1521))(ADDRESS=(PROTOCOL = TCP)(HOST = dbsrv02.desy.de)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = dbsrv03.desy.de)(PORT = 1521))(LOAD_BALANCE = yes)(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = desy_db.desy.de)(FAILOVER_MODE =(TYPE = NONE)(METHOD = BASIC)(RETRIES = 180)(DELAY = 5))))

in the bitronix-resources.properties

--> and use this in the** bonita.xml:**

<Resource name="bonitaSequenceManagerDS"
          auth="Container"
          type="javax.sql.DataSource"
          maxActive="17"
          minIdle="5"
          maxWait="10000"
          initialSize="3"
          validationQuery="SELECT 1 FROM dual"
          validationInterval="30000"
          removeAbandoned="true"
          logAbandoned="true"
          username="kraemm"
          password="Aho1ho1"
          driverClassName="oracle.jdbc.OracleDriver"
          url="jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=dbsrv01.desy.de)(PORT=1521))(ADDRESS=(PROTOCOL = TCP)(HOST = dbsrv02.desy.de)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = dbsrv03.desy.de)(PORT = 1521))(LOAD_BALANCE = yes)(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = desy_db.desy.de)(FAILOVER_MODE =(TYPE = NONE)(METHOD = BASIC)(RETRIES = 180)(DELAY = 5))))"/>

I copied the odbc.jar in the mentioned folders.

But ... it won't work. The Tomcat server just don't start. (was waiting for 20 minutes now)

I use Ubuntu 14.04 and Bonita bpm 7.1.4 Community.

Please, can somebody help me and tell me what I have to do to make this stuff work?
(the server URL work's with SQL Developer and SQLplus)

Edit:
The DB System is Oracle 12c. It seems like, the latest version supported is 11 R2?!
And my problem is, that I just want to connect to a existing Oracle Database, reached by the URL I posted above.