[2.0.4] IDE hangs in win10 --- use Java 11 (Java 15 not working)

Cant open the sikulix ide in windows 10. It just hanged without any error or interface or IDE window.
>Windows 10 Pro
>sikulix2.0.4
>java version "15.0.1"

============================================
C:\Users\Administrator>java -jar C:\Users\Administrator\Downloads\sikulixide-2.0.4.jar -v -c
[DEBUG]startUp: IDE: Running: C:\Users\Administrator\Downloads\sikulixide-2.0.4.jar
[DEBUG]startUp: IDE: AppData: C:\Users\Administrator\AppData\Roaming\Sikulix
[DEBUG]startUp: IDE: starting with classpath: C:\Users\Administrator\Downloads\sikulixide-2.0.4.jar ...
[DEBUG]startUp: IDE: no extensions.txt nor valid content
[DEBUG]startUp: IDE: moving to extensions: C:\Users\Administrator\Downloads\jython-standalone-2.7.1.jar
[DEBUG]startUp: IDE: adding extension file: C:\Users\Administrator\AppData\Roaming\Sikulix\Extensions\jython-standalone-2.7.1.jar
[297 debug] RunTime:temp folder ok: C:\Users\ADMINI~1\AppData\Local\Temp\Sikulix_471808048
Options: *** options dump
Options: testing =
Options: OptionsFile = C:\Users\Administrator\AppData\Roaming\Sikulix\SikulixStore\SikulixOptions.txt
Options: *** options dump end
***** show environment for 2.0.4-2020-03-14_08:01 API
user.home: C:\Users\Administrator
user.dir (work dir): C:\Users\Administrator
user.name: Administrator
java.io.tmpdir: C:\Users\ADMINI~1\AppData\Local\Temp
running 64Bit(amd64) on w (10.0) from a jar
java 15 version 15 vm 15.0.1+9-18 class 59.0 arch 64
app data folder: C:\Users\Administrator\AppData\Roaming\Sikulix
executing jar: C:\Users\Administrator\Downloads\sikulixide-2.0.4.jar
*** classpath dump sikulix
  0: C:\Users\Administrator\Downloads\sikulixide-2.0.4.jar
*** classpath dump end
***** show environment end
[DEBUG]startUp: IDE: *********************** leaving start
[78 debug] Sikulix: starting IDE
[125 debug] RunTime:temp folder ok: C:\Users\ADMINI~1\AppData\Local\Temp\Sikulix_1914489421
Options: *** options dump
Options: testing =
Options: OptionsFile = C:\Users\Administrator\AppData\Roaming\Sikulix\SikulixStore\SikulixOptions.txt
Options: *** options dump end
***** show environment for 2.0.4-2020-03-14_08:01 IDE
user.home: C:\Users\Administrator
user.dir (work dir): C:\Users\Administrator
user.name: Administrator
java.io.tmpdir: C:\Users\ADMINI~1\AppData\Local\Temp
running 64Bit(amd64) on w (10.0) from a jar
java 15 version 15 vm 15.0.1+9-18 class 59.0 arch 64
app data folder: C:\Users\Administrator\AppData\Roaming\Sikulix
executing jar: C:\Users\Administrator\Downloads\sikulixide-2.0.4.jar
*** classpath dump sikulix
  0: C:\Users\Administrator\Downloads\sikulixide-2.0.4.jar
  1: C:\Users\Administrator\AppData\Roaming\Sikulix\Extensions\jython-standalone-2.7.1.jar
*** classpath dump end
***** show environment end
[328 debug] IDE: running with Locale: en_US
[DEBUG]startUp: IDE: --- Sikuli parameters ---
[DEBUG]startUp: IDE: 1: -v
[DEBUG]startUp: IDE: 2: -c
[344 debug] HotkeyManager: add Capture Hotkey: CTRL+SHIFT 2 (50, 3)
[520 debug] HotkeyManager: add Abort Hotkey: ALT+SHIFT C (67, 9)
[520 debug] IDE: Init ScriptingSupport
[526 debug] IDESupport: enter
[1687 debug] Runner: added: Sikulix [] directory/sikulix
[1703 debug] Runner: init: class org.sikuli.script.runners.AbstractLocalFileScriptRunner: warning: not possible
[1703 debug] Runner: added: PowerShell [ps1] text/powershell
[1703 debug] Runner: added: Robot [robot] text/robot
[1703 debug] Runner: added: SikulixJar [jar] text/jar
[1703 debug] Runner: added: Text [txt] text/text