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Files created but remain empty

I added the internal config :

forcecwd .
stdout system.out.log
stderr system.err.log
singleinstance true
jre_order b

Log files are correctly created, but remain empty, while System.out.prinltn are outputing data while running it from console.

Note: Exe is done as a GUI application.

What am I doing wrong? Any tip to have output sent to the log file?