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Editorial Team
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Asked: 2026-05-14T01:39:10+00:00

Is it possible to return a HashMap to R with the rJava extension of

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Is it possible to return a HashMap to R with the rJava extension of R?
E.g. I have a method in Java, which returns a HashMap and I want this HashMap use in R. I tried:

.jcall(javaObj, "Ljava/util/HashMap", "getDbInfoMap")

This doesn’t work.
Do I have to put everything into a String[], that I want to pass to R from Java?
Or is there another possibility?

Any help/info on this would be greatly appreciated.

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1 Answer

  1. Editorial Team

    You’re missing a semi-colon when specifying the HashMap return type.

    .jcall(javaObj, "Ljava/util/HashMap;", "getDbInfoMap")

    See JNI Types Field Descriptors and examples of .jcall.

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