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This is probably due to a version mismatch of the drivers of Oracle 11g XE R2 JDBC drivers. The solution is to download the right version of ojdbc6dms.jar and ojdbc6.jar files from Oracle Website.
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java.lang.Error: Incompatible version of libocijdbc[Jdbc:112030, Jdbc-OCI:112020
at java.security.AccessController.doPrivileged(Native Method)