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Check out the architecture diagram on Sync requests – KX Platform for an idea of how you could set this up.
Your Java client can use sync requests with a Gateway (GW) process.
The GW can then defer the response to the Java client and send the query (async) through a Query Router (QR), thus allowing the GW to handle more client requests.
Queries then flow on to a Query Process (QP) which completes the actual work, before sending the result back to the GW, and then finally the client.
Please also see information on Callbacks