File handle leak on Win with Java 11(.0.2)

[fbricon]

Following the fix for #931, it turns out Win 10 still has an issue, when running Java 11(.0.2). I can still see a file handle leak with handler64 ( ~+2/+3 handles every 2 sec), when the server is idling:

C:\Dev\projects>c:\Dev\Handle\handle64 -s -p 6524

Nthandle v4.21 - Handle viewer
Copyright (C) 1997-2018 Mark Russinovich
Sysinternals - www.sysinternals.com

Handle type summary:
  <Unknown type>  : 95
  ALPC Port       : 1
  Desktop         : 1
  Directory       : 2
  Event           : 275
  File            : 1218
  IoCompletion    : 3
  IRTimer         : 4
  Key             : 15
  Mutant          : 2
  Section         : 2
  Semaphore       : 39
  Thread          : 39
  Token           : 2
  TpWorkerFactory : 2
  WaitCompletionPacket: 6
  WindowStation   : 2
Total handles: 1708

and several minutes later:

C:\Dev\projects>c:\Dev\Handle\handle64 -s -p 6524

Nthandle v4.21 - Handle viewer
Copyright (C) 1997-2018 Mark Russinovich
Sysinternals - www.sysinternals.com

Handle type summary:
  <Unknown type>  : 2
  <Unknown type>  : 2
  <Unknown type>  : 2
  <Unknown type>  : 95
  ALPC Port       : 1
  Desktop         : 1
  Directory       : 2
  Event           : 275
  File            : 4458
  IoCompletion    : 3
  IRTimer         : 4
  Key             : 15
  Semaphore       : 39
  Thread          : 39
  TpWorkerFactory : 2
  WaitCompletionPacket: 6
  WindowStation   : 2
Total handles: 4948

We might also want to reduce the polling frequency to 1 every 10sec.