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Last active September 19, 2019 09:50
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Calling Java vararg function in Clojure
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java-vararg-in-clojure.md

A colleague and I were using Jedis and wanted to delete multiple keys at once without using a loop. The version of Jedis we were using has 2 del functions and the one we wanted use is a java vararg function and can be found here. We understood a Java vararg function as a variadic function in Clojure which simply means a function with infinite arity. Assuming b1 and a1 are keys in redis, the following is what we attempted initially:

(.del jedis "a1" "b1")

The above failed with the following error: IllegalArgumentException No matching method found: del for class redis.clients.jedis.Jedis clojure.lang.Reflector.invokeMatchingMethod (Reflector.java:80)

A little bit of research lead us to stackoverflow and the first solution of using into-array fixed it for us. We went ahead and tried the following and it worked for us

(.del jedis (into-array ["a1" "b1"]))
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