http://www-124.ibm.com/developerworks/oss/jt400/

The IBM Toolbox for Java is a library of Java classes supporting the client/server and internet programming models to an iSeries or AS/400 server. The classes can be used by Java applets, servlets, and applications to easily access iSeries and AS/400 data and resources.

Nevertheless it is not clear if DB2Connect functionality is available here.

Also not sure if DB2 Development Center client can be run on this without an explicit DB2Connect