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From "Althaus, Volker" <v.alth...@cenit.de>
Subject [Karaf 4.0.5] Strange console log messages when using custom log appenders
Date Wed, 11 May 2016 07:47:37 GMT
Hi,
we upgraded from Karaf 4.0.4 to 4.0.5 and now we have a non-deterministic start behavior with
our custom log appenders which lead to multiple error-like output on the console.

We implemented our appender regarding to
http://blog.nanthrax.net/2012/12/create-custom-log4j-appender-for-karaf-and-pax-logging/ and
http://karaf.apache.org/manual/latest/#_advanced_configuration (Custom appenders section)

startup.properties:
-----------------------
mvn\:org.ops4j.pax.logging/pax-logging-api/1.8.5 = 8
mvn\:org.ops4j.pax.logging/pax-logging-service/1.8.5 = 8
mvn\:my.group/my.logging.fragment/1.0 = 8
(No behavior change if the fragment is moved before the service bundle as mentioned in the
second link).

MANIFEST.MF:
------------------
...
Bundle-SymbolicName: my.logging.fragment
Fragment-Host: org.ops4j.pax.logging.pax-logging-service
...

Now an example first start output is:

$ > karaf.bat
The specified feature: 'instance' version '4.0.5' is already installed
The specified feature: 'package' version '4.0.5' is already installed
The specified feature: 'log' version '4.0.5' is already installed
The specified feature: 'ssh' version '4.0.5' is already installed
The specified feature: 'aries-blueprint' version '4.0.5' is already installed
The specified feature: 'framework' version '4.0.5' is already installed
The specified feature: 'system' version '4.0.5' is already installed
The specified feature: 'feature' version '4.0.5' is already installed
The specified feature: 'shell' version '4.0.5' is already installed
The specified feature: 'management' version '4.0.5' is already installed
The specified feature: 'service' version '4.0.5' is already installed
The specified feature: 'jaas' version '4.0.5' is already installed
The specified feature: 'shell-compat' version '4.0.5' is already installed
The specified feature: 'deployer' version '4.0.5' is already installed
The specified feature: 'diagnostic' version '4.0.5' is already installed
The specified feature: 'wrap' version '0.0.0' is already installed
The specified feature: 'bundle' version '4.0.5' is already installed
The specified feature: 'config' version '4.0.5' is already installed
The specified feature: 'kar' version '4.0.5' is already installed
The specified feature: 'instance' version '4.0.5' is already installed
The specified feature: 'package' version '4.0.5' is already installed
The specified feature: 'log' version '4.0.5' is already installed
The specified feature: 'ssh' version '4.0.5' is already installed
The specified feature: 'aries-blueprint' version '4.0.5' is already installed
The specified feature: 'framework' version '4.0.5' is already installed
The specified feature: 'system' version '4.0.5' is already installed
The specified feature: 'feature' version '4.0.5' is already installed
The specified feature: 'shell' version '4.0.5' is already installed
The specified feature: 'management' version '4.0.5' is already installed
The specified feature: 'service' version '4.0.5' is already installed
The specified feature: 'jaas' version '4.0.5' is already installed
The specified feature: 'shell-compat' version '4.0.5' is already installed
The specified feature: 'deployer' version '4.0.5' is already installed
The specified feature: 'diagnostic' version '4.0.5' is already installed
The specified feature: 'wrap' version '0.0.0' is already installed
The specified feature: 'bundle' version '4.0.5' is already installed
The specified feature: 'config' version '4.0.5' is already installed
The specified feature: 'kar' version '4.0.5' is already installed
        __ __                  ____
       / //_/____ __________ _/ __/
      / ,<  / __ `/ ___/ __ `/ /_
     / /| |/ /_/ / /  / /_/ / __/
    /_/ |_|\__,_/_/   \__,_/_/

  Apache Karaf (4.0.5)

Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf.

karaf@root()>
        __ __                  ____
       / //_/____ __________ _/ __/
      / ,<  / __ `/ ___/ __ `/ /_
     / /| |/ /_/ / /  / /_/ / __/
    /_/ |_|\__,_/_/   \__,_/_/

  Apache Karaf (4.0.5)

Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf.

karaf@root()>

Not a copy'n'paste mistake - really duplicated output.

As this did not happen in Karaf 2, 3 and 4.0.4 I think this could be bug in the new boot feature
"framework" which has been added in 4.0.5.
It seems that the whole core is restarted when the custom logging fragment is there.

Do you agree with me and should I raise a Jira issue for that? And in case this is a bug -
do you have an idea for a workaround? Or could it be an implementation mistake of the appender?
We ship a custom distribution to our customers and this behavior is a no-go because they could
think that something failed even at the end the application has started correctly.
It does not make a good impression when the customers are faced with some strange messages
even at the first start.


TIA & Regards
  Volker

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