[
https://issues.apache.org/jira/browse/LOG4J2-951?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Joe Merten updated LOG4J2-951:
------------------------------
Description:
[This|https://github.com/Joe-Merten/Mpjoe/tree/master/Android] small Android
project compiles using {{mvn clean install}}.
It includes something like
{code:java}
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
// ...
logger.info("=== Initialized ===");
{code}
But I didn't see my logging output on logcat.
Seems that I need something like a {{LogcatAppender}} but couldn't find hints
how to do that.
I found [this|https://code.google.com/p/android-logging-log4j] project but it
has no commits over the last 2 years and so it seems that it not fits to log4j2.
Seeing this output in logcat:
{quote}
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add
log4j-core to the classpath. Using SimpleLogger to log to the console...
{quote}
A bit further investigation:
* as log as I'm unable to load log4j2.xml, log4j uses the SimpleLogger
* logging with {{logger.fatal()}} and {{logger.error()}} gave me output to
logcat, but both with {{Level = Warning}} and {{Tag = System.err}}
* all other {{logger.warn()}} ... {{logger.trace()}} were suppressed
So falling back to the key questions: How to configure log4j2 properly to
produce correct Android logcat output?
* want to have the loglevel placed correctly
* using the classname for the logcat tag seems a nice idea
(I'd also tried out
[this|http://stackoverflow.com/questions/28235021/log4j2-on-android]
(log4j2.xml content into a String) but without success.)
Could anybory help?
was:
[This|https://github.com/Joe-Merten/Mpjoe/tree/master/Android] small Android
project compiles using `mvn clean install`.
It includes something like
{code:java}
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
// ...
logger.info("=== Initialized ===");
{code}
But I didn't see my logging output on logcat.
Seems that I need something like a `LogcatAppender` but couldn't find hints how
to do that.
I found [this|https://code.google.com/p/android-logging-log4j] project but it
has no commits over the last 2 years and so it seems that it not fits to log4j2.
Could you help?
Edit, seeing this output in logcat:
{quote}
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add
log4j-core to the classpath. Using SimpleLogger to log to the console...
{quote}
So, it might relate to [#461|https://issues.apache.org/jira/browse/LOG4J2-461]
but cannot find a solution there.
> How to use log4j2 with Android (Logcat)?
> ----------------------------------------
>
> Key: LOG4J2-951
> URL: https://issues.apache.org/jira/browse/LOG4J2-951
> Project: Log4j 2
> Issue Type: Question
> Components: Appenders
> Affects Versions: 2.1
> Environment: Android
> Reporter: Joe Merten
> Labels: Android, maven
>
> [This|https://github.com/Joe-Merten/Mpjoe/tree/master/Android] small Android
> project compiles using {{mvn clean install}}.
> It includes something like
> {code:java}
> import org.apache.logging.log4j.LogManager;
> import org.apache.logging.log4j.Logger;
> // ...
> logger.info("=== Initialized ===");
> {code}
> But I didn't see my logging output on logcat.
> Seems that I need something like a {{LogcatAppender}} but couldn't find hints
> how to do that.
> I found [this|https://code.google.com/p/android-logging-log4j] project but it
> has no commits over the last 2 years and so it seems that it not fits to
> log4j2.
> Seeing this output in logcat:
> {quote}
> ERROR StatusLogger Log4j2 could not find a logging implementation. Please add
> log4j-core to the classpath. Using SimpleLogger to log to the console...
> {quote}
> A bit further investigation:
> * as log as I'm unable to load log4j2.xml, log4j uses the SimpleLogger
> * logging with {{logger.fatal()}} and {{logger.error()}} gave me output to
> logcat, but both with {{Level = Warning}} and {{Tag = System.err}}
> * all other {{logger.warn()}} ... {{logger.trace()}} were suppressed
> So falling back to the key questions: How to configure log4j2 properly to
> produce correct Android logcat output?
> * want to have the loglevel placed correctly
> * using the classname for the logcat tag seems a nice idea
> (I'd also tried out
> [this|http://stackoverflow.com/questions/28235021/log4j2-on-android]
> (log4j2.xml content into a String) but without success.)
> Could anybory help?
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