Why do I get java.lang.AbstractMethodError: oracle.jdbc.driver.OracleConnection error?

The cause of the problem is incompatible software (jar files).

createBlob is a new method (introduced in java 1.6), so older drivers are very unlikely to implement it.

Make sure your classpath only contains compatible drivers, and not any earlier versions of the drivers. (Thanks Jochen)

As others have said this is due to an older Oracle JDBC driver.

In my case replacing ojdbc14.jar (Oracle JDBC driver 10.1.0.5.0) with ojdbc16.jar (Oracle JDBC driver 11.2.0.4.0) fixed the problem.