Lukasz Lech created KARAF-5348:
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Summary: Log redirected to Console, hangs until Ctrl+C pressed
Key: KARAF-5348
URL: https://issues.apache.org/jira/browse/KARAF-5348
Project: Karaf
Issue Type: Bug
Components: karaf-shell
Affects Versions: cellar-4.1.0
Environment: Windows 10 x64
Reporter: Lukasz Lech
The issue is random. It happens from time to time, after starting Karaf.
Everything starts fine, until my code invokes JPA and an attempt to create
database connection is made. Than everything hangs.
My attempts to locate the problem are listed here:
https://stackoverflow.com/questions/45283937/eclipselink-hangs-while-creating-session-in-logging-subsystem
I've located the hanging threads and I've found out, that it's the
FileOutputStream.writeBytes method that hangs. It is invoked by EntityManager's
attempt to log info.
The solution was to restart karaf, because the error seemed to happen randomly
every X starts. However, recently I've accidentally pressed Ctrl+C in console
and the call unlocked, with the log message apearing onto console.
It looks like, then, that it was the console that was blocking the call. I'm
not sure if it's not caused by accidentally pressing some key in the moment the
cmd window appear on screan and steals focus, however, anything blocking
logging subsystem is a potential bug in production system.
I haven't noticed that behaviour on linux (I launch Karaf in docker container
there) but I can't state either the problem is limited to Windows. It seems to
be random, anyway, so I have no strategy to replicate it.
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