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https://issues.apache.org/jira/browse/KARAF-6385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean-Baptiste Onofré updated KARAF-6385:
----------------------------------------
Fix Version/s: 4.2.7
4.3.0
> WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will
> impact performance.
> ----------------------------------------------------------------------------------------------
>
> Key: KARAF-6385
> URL: https://issues.apache.org/jira/browse/KARAF-6385
> Project: Karaf
> Issue Type: Bug
> Components: karaf
> Environment: Karaf 4.3.0 + Java 11
> Reporter: Xtra Coder
> Assignee: Jean-Baptiste Onofré
> Priority: Major
> Fix For: 4.3.0, 4.2.7
>
>
> I've tried using Karaf 4.3.0 built from sources (to fix another issue) and on
> Java 11 now am always getting following message in console:
> {code:java}
> WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will
> impact performance.
> {code}
> It appears it comes from log4j (specifically [this
> line|https://github.com/apache/logging-log4j2/blob/master/log4j-api/src/main/java/org/apache/logging/log4j/util/StackLocator.java#L78])
> and is raised because on Java 11 reflection from Java8 does not work and
> "org.ops4j.pax.logging" does not include java9-compatible classes most
> probably because of [this issue|https://github.com/bndtools/bnd/issues/2227].
> This message does not appear in Karaf 4.2.6 and after some debugging I see
> this is happening because in 4.2.6 version of "org.ops4j.pax.logging" is
> 1.10.2 and code goes through [this
> line|https://github.com/ops4j/org.ops4j.pax.logging/blob/paxlogging-1.10.x/pax-logging-log4j2/src/main/java/org/ops4j/pax/logging/log4j2/internal/PaxAppenderProxy.java#L61]:
>
> _getServices() returns null and therefore event.getLocationInformation() is
> not invoked_
> {code:java}
> public void doAppend( PaxLoggingEvent event )
> {
> if (count != getTrackingCount()) {
> count = getTrackingCount();
> appenders = getServices();
> }
> if (appenders != null && appenders.length > 0) {
> // Bug in Karaf, as it expects the source to be available
> event.getLocationInformation();
> for (Object appender : appenders) {
> ((PaxAppender) appender).doAppend(event);
> }
> }
> }
> {code}
> In "org.ops4j.pax.logging" v1.11.0 (included in 4.3.0) code goes through
> [this
> line|https://github.com/ops4j/org.ops4j.pax.logging/blob/master/pax-logging-api/src/main/java/org/ops4j/pax/logging/spi/support/PaxAppenderProxy.java#L67]:
>
> _because getServices(<empty array>) returns that same empty array, code
> falls into 'if' with that empty array and event.getLocationInformation(); is
> called (what throws the subject WARNING), whereas its output is not used
> because list of appenders is empty - no event.getLocationInformation() == no
> WARNING_
> {code:java}
> @Override
> public void doAppend(PaxLoggingEvent event) {
> if (count != getTrackingCount()) {
> count = getTrackingCount();
> appenders = getServices(new PaxAppender[0]);
> }
> if (appenders != null) {
> // Bug in Karaf, as it expects the source to be available
> event.getLocationInformation();
> for (PaxAppender appender : appenders) {
> appender.doAppend(event);
> }
> }
> }
> {code}
> So ... it seems it is bug in "org.ops4j.pax.logging" v1.11.0 and it is to
> early to include it into Karaf.
>
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