Nashorn internal objects and assessing memory leaks

[BURRIS Thomas]

Hi ... I'm trying to assess a potential memory leak in my system that heavily uses Nashorn. When I start up a relatively simple environment (simple in terms of usage compared to our prod env), I quickly see a lot of nashorn stuff. For example:

object count     total size    class name
      47179        4529184    jdk.nashorn.internal.runtime.RecompilableScriptFunctionData
      1413          45216    jdk.nashorn.internal.runtime.Source
      1413          33912    jdk.nashorn.internal.runtime.Source$RawData
      708          16992    jdk.nashorn.api.scripting.ScriptObjectMirror

The problem is that I don't know how to assess whether this is unusual because I can't find any online guidance about what these things are and what they correspond to in terms of Nashorn's public classes/objs like a) nashorn engines; b) objects in global namespace of individual nashorn engines; c) ScriptObjectMirrors resulting from engine.eval(..); d) etc. Is there documentation anywhere of what these things are? Or of how to assess what would be considered a memory leak? (i.e., an ureasonable proliferation of internal Nashorn objects)?

thank you for any suggestions

thom.


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