How to reset JDBCPoolMaxPoolSize on a Java/Oracle Stack?

How to reset JDBCPoolMaxPoolSize on a Java/Oracle Stack?

  
We ran configurationtool and set both attributes JDBCPoolMinPoolSize and JDBCPoolMaxPoolSize to 1.

Now we can't start the Depployment Controller anymore. Even changing again to 10/100 we receive the message: Exception in thread "main" java.sql.SQLException: Exception occurred while getting connection: oracle.ucp.UniversalConnectionPoolException: All connections in the Universal Connection Pool are in use

How to reset the Connection Pool size configurations?
We found a way. By changing the file /etc/.java/.systemPrefs/outsystems/prefs.xml and restarting the services.