It depends on the GC settings. With the other JEPS I listed, things should become more aggressive. But today you can have:

    > java -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 test.java
    used=7640 MB, committed=7668 MB, max=8192 MB
    used=4 MB, committed=20 MB, max=8192 MB
    used=3 MB, committed=8 MB, max=8192 MB
    used=3 MB, committed=8 MB, max=8192 MB

The RSS drops from ~8GB to 8 MB.