Question: how to convert kdb to jks?
Answer: Create an empty Java Key Store (jks): runmqckm -keydb -create -db target.jks -type jks. ... 
Import all certs from the source kdb file to the target jks file created above: ... 
You can then list the certs contained in both the kdb and the jks to compare and validate that all certs were copied over: