You cannot use group-in and group-out to handle binary data such as those that represent BLOB or bulk streams. Your adapter written with the JADK can read and write these types of data with the proper use of the APIs defined with the RequestContext class.

The writeBlobStream method takes an input stream from your adapter and writes it back to the Info*Engine output stream, thereby sending it to your web browser.

The readBlobStream method reads a BLOB or a file from the Info*Engine input stream and writes it into the adapter specific output stream that you passed.