DB2 Universal Database implements two standards-based Java programming APIs: Java Database Connectivity (JDBC) and embedded SQL for Java (SQLJ). Both can be used to create Java applications and applets that access DB2.
JDBC calls are translated to calls to DB2 CLI through Java native methods. JDBC requests flow from the DB2 client through DB2 CLI to the DB2 server. Static SQL cannot be used by JDBC.
SQLJ applications use JDBC as a foundation for such tasks as connecting to databases and handling SQL errors, but can also contain embedded static SQL statements in the SQLJ source files. An SQLJ source file has to be translated with the SQLJ translator before the resulting Java source code can be compiled.
For more information on JDBC and SQLJ applications, refer to the Application Development Guide.