Why is DB2 Type 4 JDBC Driver looking for native library db2jcct2?

Question

I thought the Type 4 JDBC driver was pure Java and wouldn't require native libraries.

When I put db2jcc4.jar in the WEB-INF/lib directory of my Tomcat app packaged as a .war file, I get the following error when attempting to use the app: Got SQLException: com.ibm.db2.jcc.am.SqlException: [jcc][10389][12245][4.12.55] Failure in loading native library db2jcct2, java.lang.UnsatisfiedLinkError

The relevant application code is as follows and the exception is thrown due to the last line in the listing:

        import com.ibm.db2.jcc.DB2SimpleDataSource;

        // ...

        DB2SimpleDataSource main_db2_data_source = new DB2SimpleDataSource();
        main_db2_data_source.setUser(main_database_user);
        main_db2_data_source.setPassword(main_database_password);
        main_db2_data_source.setServerName(main_database_host);
        try {
          Integer main_database_port_integer = Integer.parseInt(main_database_port);
          main_db2_data_source.setPortNumber(main_database_port_integer);
        } catch (NumberFormatException exception) {
          throw new WebException("...");
        }
        Connection main_connection = null;
        try {
          main_connection = main_db2_data_source.getConnection();

Answer 1

I suspect the problem is that you haven't told it to use the type 4 driver - the same jar file contains both type 4 and type 2 drivers, I believe.

Try:

main_db2_data_source.setDriverType(4);

Answer 2

The db2 driver needs another jar that includes the license.

This license controls the connection type. If you are going to use "db2 connect" to connect to a mainframe as an i series you should use the corresponding license. If you are going to connect to a Linux UNIX or Windows server, the license is included when you get the "Data server client for JDBC"