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From Markus Rathgeb <maggu2...@gmail.com>
Subject Re: Karaf: Java detection on Karaf
Date Tue, 05 Mar 2019 15:35:48 GMT

> I don't think java-config is used if you have JAVA_HOME defined right ?
> (it's what I have on my systems).

You are using Gentoo / have a readable file "/etc/gentoo-release" and
you also did not install the system wide java support?
What a remarkable coincidence.

I wonder why it is working on your system.
My reading of the scripts indicates the problem should exist in this

Please have a look at the output following information:

Here my current JAVA_HOME:
$ echo $JAVA_HOME

As you can see java is part of the PATH
$ command -v java

The current java version is
$ java -version
java version "1.8.0_202"
Java(TM) SE Runtime Environment (build 1.8.0_202-b08)
Java HotSpot(TM) 64-Bit Server VM (build 25.202-b08, mixed mode)

Now let's start Karaf
$ bin/karaf
line 198: java-config: command not found
karaf: JAVA_HOME not set; results may vary
karaf: Enabling Java debug options:
Listening for transport dt_socket at address: 5005
        __ __                  ____
       / //_/____ __________ _/ __/
      / ,<  / __ `/ ___/ __ `/ /_
     / /| |/ /_/ / /  / /_/ / __/
    /_/ |_|\__,_/_/   \__,_/_/

  Apache Karaf (4.3.0-SNAPSHOT)

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.


You see the message
line 198: java-config: command not found

So, please have a look at:

if [ "x${JAVA}" = "x" ] && [ -r /etc/gentoo-release ] ; then
    JAVA_HOME=$(java-config --jre-home)

If the environment JAVA is not set (AFAIK this is not a commonly used
one) and there is a readable "/etc/gentoo-release" file, JAVA_HOME is
set by using "java-config" -- regardless if the tool is present.

The "locateJava" method is called by e.g. the init method of Karaf.

> but you can define JAVA_HOME in bin/inc right ?

Sure, I can modify "bin/inc" all the time I unpack the official distribution.
But is this what you would like to tell users?
e.g. "If you unpack the official distribution and use Gentoo without
"java-config" present, please edit the "bin/inc" file in front of
starting karaf."
I don't think this is nice if we could modify the script so no
interaction is necessary.

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