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

问题

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();

回答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);

回答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"

回答3:

Also try this:

Goto Configure Build Path --> Libraries 
                             --> JRE System Libraries 
                                --> Native Library Location : Set this to %DB2HOME%/BIN 
                             (which is where db2jcct2.dll is saved)

回答4:

Recently i have faced this issue, when i was connecting to DB2 from Glassfish server. for this i have followed below steps and resolved this issue. Please check it the below steps

step1) i have checked DB2 details in Domain.xml file.there i have seen only username,pwd,databaseName,serverName ,portnumber, But i havent see DriverType. Means Type of driver is 2 or 4.

2)for adding Type of driver i have logged into the Glassfish server admin console

Resources-->JDBC-->Connection pool -->our poolname --.add extra property

here i haved added as drivertype is 4.

Hence my problem has been solved

Thanks, Ramaiah Pillala.

来源：https://stackoverflow.com/questions/8325248/why-is-db2-type-4-jdbc-driver-looking-for-native-library-db2jcct2

标签

java

jdbc

db2