A JVM question: my java-kotlin program shows the h...

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[voddan]

A JVM question: my java-kotlin program shows the heap size under 400Mb (via VirtualVM), but on Linux (not on MacOS) the aggregated memory footprint starts to increase while operation and reaches 4Gb and higher (via OS).
This can't be a leak in the JVM, can it?
Are there any tools to investigate such problems?