Java - Exception in thread "main" java.lang.Error: Unresolved compilation problems
This error happens when you use Eclipse as IDE and try to run code that doesn't even compile. Check your Problems view in Eclipse, and fix the compilation errors before executing the application.
You are using a MySQL driver, but your class uses an Oracle BLOB class. Either use the Oracle JDBC driver, or use a different class for BLOB.
Since your code mentions HSQL, MySQL and Oracle, you will probably want to get rid of the Oracle-specific BLOB implementation.