I would recommend adding it as a special Lookup just like hostname is. Then in
your pattern layout you just need to specify the header as ${java-version} or
${java-short-version}, etc.
Ralph
On Sep 18, 2014, at 9:51 AM, Gary Gregory <[email protected]> wrote:
>
> I would like the start of my logs to start with the same information "java
> -version" provides.
>
> On the console, "java -version" says:
>
> java version "1.8.0_20"
> Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
> Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)
>
> I cook this up manually now from system properties but it sure would be nice
> to ask Log4j to do it for me since 'java -version' is something I am sure we
> are all used to seeing.
>
> This could be done with special pre-built Message classes and % markers I can
> also add to the header of a file (or any) appender.
>
> I could see a:
>
> JavaShortVersionMessage and %JavaShortVersion produce:
> java version "1.8.0_20"
>
> JavaJreVersionMessage %JavaJreVersion produce:
>
> Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
>
> JavaVmVersionMessage and %JavaVmVersion produce:
> Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)
>
> In code I could say:
>
> logger.debug(new JavaShortVersionMesssage());
> logger.debug(new JavaJreVersionMessage());
> logger.debug(new JavaVmVersionMessage());
>
> In a file appender I could say header="My
> App%n%JavaShortVersionMessage%n%JavaJreVersionMessage%n%JavaVmVersionMessage%n"
>
> Or maybe we could have someway to break a header into >1 log event.
>
> Thoughts?
>
> Gary
>
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