Start sikuli java process failed

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Hello,

I can't start the Sikuli Process. I spent so much time trying to find the bug, but I can find it.
Could you please take a look?
Please find the logs below:

KEYWORD SikuliLibrary . Start Sikuli Process
Start / End / Elapsed: 20200421 10:56:30.692 / 20200421 10:59:22.828 / 00:02:52.136
10:56:30.692 TRACE Arguments: [ ]
10:56:30.693 DEBUG Free TCP port is: 53098
10:56:30.698 INFO Starting process:
java -jar c:\users\xxx\appdata\local\programs\python\python38-32\lib\site-packages\SikuliLibrary\lib\SikuliLibrary.jar 53098 C:\Users\xxx\GIT\xxx\testscripts
10:56:30.698 DEBUG Process configuration:
cwd: C:\Users\xxx\GIT\xxx\testscripts
shell: True
stdout: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stdout_1587459390.6936052.txt
stderr: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stderr_1587459390.6936052.txt
alias: None
env: None
10:56:30.701 INFO Start sikuli java process on port 53098
10:56:34.945 INFO Gracefully terminating process.
10:57:05.033 INFO Graceful termination failed.
10:57:05.033 INFO Forcefully killing process.
10:57:05.134 INFO Process completed.
10:57:05.137 DEBUG Free TCP port is: 53112
10:57:05.140 INFO Starting process:
java -jar c:\users\xxx\appdata\local\programs\python\python38-32\lib\site-packages\SikuliLibrary\lib\SikuliLibrary.jar 53112 C:\Users\xxx\GIT\xxx\testscripts
10:57:05.140 DEBUG Process configuration:
cwd: C:\Users\xxx\GIT\xxx\testscripts
shell: True
stdout: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stdout_1587459425.138538.txt
stderr: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stderr_1587459425.138538.txt
alias: None
env: None
10:57:05.144 INFO Start sikuli java process on port 53112
10:57:09.399 INFO Gracefully terminating process.
10:57:39.402 INFO Graceful termination failed.
10:57:39.402 INFO Forcefully killing process.
10:57:39.504 INFO Process completed.
10:57:39.504 DEBUG Free TCP port is: 53126
10:57:39.506 INFO Starting process:
java -jar c:\users\xxx\appdata\local\programs\python\python38-32\lib\site-packages\SikuliLibrary\lib\SikuliLibrary.jar 53126 C:\Users\xxx\GIT\xxx\testscripts
10:57:39.506 DEBUG Process configuration:
cwd: C:\Users\xxx\GIT\xxx\testscripts
shell: True
stdout: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stdout_1587459459.5049212.txt
stderr: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stderr_1587459459.5049212.txt
alias: None
env: None
10:57:39.510 INFO Start sikuli java process on port 53126
10:57:43.752 INFO Gracefully terminating process.
10:58:13.836 INFO Graceful termination failed.
10:58:13.836 INFO Forcefully killing process.
10:58:13.946 INFO Process completed.
10:58:13.946 DEBUG Free TCP port is: 53144
10:58:13.946 INFO Starting process:
java -jar c:\users\xxx\appdata\local\programs\python\python38-32\lib\site-packages\SikuliLibrary\lib\SikuliLibrary.jar 53144 C:\Users\xxx\GIT\xxx\testscripts
10:58:13.946 DEBUG Process configuration:
cwd: C:\Users\xxx\GIT\xxx\testscripts
shell: True
stdout: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stdout_1587459493.945574.txt
stderr: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stderr_1587459493.945574.txt
alias: None
env: None
10:58:13.946 INFO Start sikuli java process on port 53144
10:58:18.196 INFO Gracefully terminating process.
10:58:48.289 INFO Graceful termination failed.
10:58:48.289 INFO Forcefully killing process.
10:58:48.399 INFO Process completed.
10:58:48.399 DEBUG Free TCP port is: 53157
10:58:48.414 INFO Starting process:
java -jar c:\users\xxx\appdata\local\programs\python\python38-32\lib\site-packages\SikuliLibrary\lib\SikuliLibrary.jar 53157 C:\Users\xxx\GIT\xxx\testscripts
10:58:48.414 DEBUG Process configuration:
cwd: C:\Users\xxx\GIT\xxx\testscripts
shell: True
stdout: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stdout_1587459528.3987553.txt
stderr: C:\Users\xxx\GIT\xxx\testscripts\Sikuli_java_stderr_1587459528.3987553.txt
alias: None
env: None
10:58:48.414 INFO Start sikuli java process on port 53157
10:58:52.675 INFO Gracefully terminating process.
10:59:22.721 INFO Graceful termination failed.
10:59:22.721 INFO Forcefully killing process.
10:59:22.823 INFO Process completed.
10:59:22.826 DEBUG Free TCP port is: 53175
10:59:22.826 INFO error........Start sikuli java process failed!
error........Start sikuli java process failed!
error........Start sikuli java process failed!
error........Start sikuli java process failed!
error........Start sikuli java process failed!
10:59:22.828 FAIL Start sikuli java process failed!
10:59:22.828 DEBUG Traceback (most recent call last):
File "c:\users\xxx\appdata\local\programs\python\python38-32\lib\site-packages\SikuliLibrary\sikuli.py", line 253, in run_keyword
return self.start_sikuli_process(*arguments)
File "c:\users\xxx\appdata\local\programs\python\python38-32\lib\site-packages\SikuliLibrary\sikuli.py", line 92, in start_sikuli_process
raise RuntimeError('Start sikuli java process failed!')
10:56:30.692 TRACE Arguments: [ ${Dateiname}='' ]

**Env Details:**
OS : Window 10
Python Version: 3.8.1
Robot Framework 3.1.2
Robot-SikuliLibrary : 1.0.8 (installed via pip)
Java: 1.8.0_201

Many thanks in advance for your help!

Start by inspecting sikuli.py around line 92, where start_sikuli_process raises the failure, and compare it with the Java process invocation and the generated Sikuli_java_stdout and Sikuli_java_stderr files described in the report. Reproduce Start Sikuli Process with the stated Windows, Python, Robot Framework, Java, and SikuliLibrary versions; done means the Java process starts successfully or the failure is reported with its underlying cause.

Written by the indexing model from the issue text.