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based on an earlier version of the Wolfram Language.
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ReleaseJavaObject

ReleaseJavaObject[javaobject]
tells the Java memory-management system to forget about any references to the specified JavaObject that are being maintained solely for the sake of Mathematica.
  • To use ReleaseJavaObject, you first need to load J/Link using Needs["JLink`"].
  • The JavaObject in Mathematica is no longer valid after the call.
  • Call ReleaseJavaObject when you are completely finished with an object in Mathematica, and want to allow it to be garbage-collected in Java.