Hi Tirumala,
this indicates that you are using an ojdbc.jar compiled with a newer version of Java than your IS is running on.
The number in the jar file name indicates the minimum Java version with which this jar file can be used.
Java Classfile version 52.0 stands for Java 8 and 54.0 stands for Java 10.
Please check if you are able to download an older version of the jdbc driver from Oracle (latest version for Release 12c R2 should match your requirements).
Regards,
Holger
#webMethods#Integration-Server-and-ESB