The low-level Java connector library includes the low-level class libraries on which the high-level Java connector library is based. This connector class library contains predefined classes for low-level Java connectors. The low-level Java connector library also provide utilities, such as methods to implement tracing and logging services.
IBM includes the predefined classes and interfaces of the low-level Java connector library in the product Java jar (Java archive file), crossworlds.jar. The crossworlds.jar file resides in the bin subdirectory of the product directory.