please remove the ojdbc14.jar completely (it was built with Java 1.4) and use (replace it with) ojdbc7.jar (which was built with JVM 7).
Update ojdbc7.jar to Oracle client version 220.127.116.11 (the last one which has an ojdbc7.jar available).
ojdbc14.jar has some issues with LOB handling when driver is running in thin mode which is needed by the JDBC Adapter as long as you are not adding the native oci library for the driver.
Additionally check if it is possible for you to update the JDBC Adapter to version 9.0.
See JDBC Adapter users guide for how to migrate the services to match the new services templates (there is a migration service inside the updated Adapter package).
Furthermore you should consider upgrading to wM 9.12/wM 10.x, which provide newer versions of the JDBC Adapter (9.10, 10.1 and 10.3). These versions are running in JVM 8 and therefore support newer versions of ojdbc8.jar, which will make use of the new JDBC 4 features resulting in better performance and stability.