If you are seeing errors in your jbridge.log file like Error initiating Splunk context and Premature end of file messages, you may be seeing something similar to what I saw.
I run my apps on a VM under VMware Fusion and I have a habit of suspending VM's between uses (I do a lot of testing on various apps as a Splunk SE). My problem turned out to be corrupted storage, my guess, that is probably due to these frequent VM suspend operations.
I was instructed to do a recursive delete of the /global directory at this location:
$SPLUNK_DB/persistentstorage/dbx/global
When I did that, I restarted Splunk and the Java Bridge Server came right up.
Might be worth a try.
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