This parameter specifies the directory under which the 64-Bit Software Developer's Kit (SDK) for Java™, to be used for running DB2® administration server functions, is installed.
Environment variables used by the Java interpreter are computed from the value of this parameter. This parameter is only used on those platforms that support both 32- and 64-bit instances.
Because there is no default value for this parameter, you should specify a value when you install the SDK for Java.
This parameter can only be updated from a Version 8 command line processor (CLP).