If you don’t want to merge a specific type of file, you can change its type to a “copy merge” policy (ClearCase will copy the source over the destination)
cleartool find . -name '*.jar' -exec 'cleartool chtype "COPY_MERGE" $CLEARCASE_XPN'
This is an improvement from the NEVER_MERGE presented in this IBM article, and is available in ClearCase 7.x.
You can create a custom “FILE_COPY_MERGE” type as described here:
cleartool mkeltype -supertype compressed_file -mergetype copy -nc FILE_COPY_MERGE
cleartool chtype FILE_COPY_MERGE 'element'
A more complete example is detailed in this technote “Handling binary files in ClearCase“: