You can control the translation of SQLJ class through the controls in the Project Settings dialog. SQLJ provides syntactic as well as semantic checking of your SQL code. SQLJ will do syntax and type checking on the SQL statements, testing the compatibility of Java and SQL expressions at compile time. As a compile time option, you also can specify a connection to a database server, and have SQLJ check the semantics of your SQL statements against the database schemas specified by connection contexts.
To set the SQLJ translator options:
Embedding SQL in Java Programs with SQLJ