Hi all Log4j2 / OSGi experts!
Relates:
https://issues.apache.org/jira/browse/LOG4J2-159?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
I recognize that there is a need for discussion how log4j2 can be configured
and started correctly in an OSGi environment.
The standard procedure with configuration files in OSGi is to place them in
a fragmented bundle, so that the host finds the file in the classpath.
Obviously, there are still problems in beta9.
Error-msg: StatusLogger Unable to locate a logging implementation, using
SimpleLogger
Having spent 2 hours figuring out how Log4j2 reads the configurations I've
capitulated.
So,...I want to tell other readers how I would do it. Maybe I can help...
How I usually load configuration files from fragmented bundles:
1. Put the configuration file log4j2.xml to a fragmented bundle.
(->log4j2-users)
2. Implement the "BundleActivator"-interface (OSGi-core) for the
host-bundle. (->log4j2-devs.)
3. Add <Bundle-Activator>my.package.MyBundleActivator</Bundle-Activator> to
the maven-bundle-plugin instructions
(...<instructions><Bundle-Activator>...</Bundle-Activator></instructions>)
in the pom.
4. Implement the methode "start(BundleContext context)" so that it loads the
log4j2.xml on bundle-startup.
short expample...
private void readConfiguration(String directory, String filename)
{
URL url = null;
Enumeration<URL> fileurls = null;
InputStream is = null;
//bundlecontext of host
if(bundlecontext != null) {
fileurls = bundlecontext.getBundle().findEntries(directory, filename,
true); //get url of configuration
}
if((fileurls != null) && (fileurls.hasMoreElements())) {
url = fileurls.nextElement(); //take the first
}
if(url != null) {
is = url.openStream();
}
if(is != null) {
...
//read stream
}
}
This is one of among many possibilities how it can be done.
Are there better ideas?
Regards
Roland
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