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https://issues.apache.org/jira/browse/LOG4J2-345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Roland Weiglhofer updated LOG4J2-345:
-------------------------------------
Attachment: log4j2-OSGi.patch
> logging.log4j-1.2-api doesn't export the log4j API 1.2. Dependent bundles can
> not be resolved.
> ----------------------------------------------------------------------------------------------
>
> Key: LOG4J2-345
> URL: https://issues.apache.org/jira/browse/LOG4J2-345
> Project: Log4j 2
> Issue Type: Bug
> Components: log4j 1.2 emulation
> Affects Versions: 2.0-beta4, 2.0-beta8, 2.0-beta9
> Environment: OSGi / Apache Felix 4.x
> Reporter: Roland Weiglhofer
> Labels: Bundle, Export-Package, Maven-Bundle-Plugin, OSGi, POM
> Fix For: 2.0
>
> Attachments: log4j2-OSGi.patch
>
>
> Hi all Log4j/OSGi experts!
> Yesterday I started to migrate from log4j to log4j2. I replaced all Log4j 1.x
> bundles with log4j-1.2-api as described here:
> http://logging.apache.org/log4j/2.x/log4j-1.2-api/index.html
> But I got following error:
> Unresolved constraint in bundle MyBundle [21]: Unable to resolve 21.0:
> missing requirement [21.0] osgi.wiring.package;
> (&(osgi.wiring.package=org.apache.log4j)(version>=1.2.0)(!(version>=2.0.0)))
> so...I checked the capabilities of the log4j-1.2-api bundle:
> g! inspect cap * 11
> org.apache.logging.log4j-1.2-api [11] provides:
> -----------------------------------------------
> osgi.wiring.bundle; org.apache.logging.log4j-1.2-api 2.0.0.beta8 [UNUSED]
> osgi.wiring.host; org.apache.logging.log4j-1.2-api 2.0.0.beta8 [UNUSED]
> As you can see logging.log4j-1.2-api doesn't export the log4j API 1.2. It
> still requires log4j 1.2. All dependent bundles can not be resolved until I
> add the old log4j.jar.
> The maven-bundle-plugin does not export the packages. So, my suggestion for
> the poms is the following:
> parent pom
> ...
> <properties>
> ...
> <osgi.export.log4j1.2>org.apache.log4j;version=1.2</osgi.export.log4j1.2>
> </properties>
> ...
> <build>
> <plugins>
> ...
> <plugin>
> <groupId>org.apache.felix</groupId>
> <artifactId>maven-bundle-plugin</artifactId>
> <extensions>true</extensions>
> <configuration>
> <instructions>
> <_nouses>true</_nouses>
>
> <_removeheaders>JAVA_1_3_HOME,JAVA_1_4_HOME,JAVA_1_5_HOME,JAVA_1_6_HOME,JAVA_1_7_HOME,JAVA_1_8_HOME,JAVA_1_9_HOME</_removeheaders>
> </instructions>
> </configuration>
> </plugin>
> ...
> log4j12-api pom
> ...
> <packaging>bundle</packaging>
> ...
> <build>
> <plugins>
> ...
> <plugin>
> <groupId>org.apache.felix</groupId>
> <artifactId>maven-bundle-plugin</artifactId>
> <inherited>true</inherited>
> <configuration>
> <instructions>
> <Bundle-SymbolicName>${osgi.symbolicName}</Bundle-SymbolicName>
> <Private-Package>${osgi.private}</Private-Package>
> <Import-Package>${osgi.import},*</Import-Package>
>
> <DynamicImport-Package>${osgi.dynamicImport}</DynamicImport-Package>
> <Bundle-DocURL>${project.url}</Bundle-DocURL>
> <Export-Package>${osgi.export.log4j1.2}</Export-Package>
> </instructions>
> </configuration>
> </plugin>
> ...
> First, In the parent pom I added <extensions>true</extensions> to include the
> extension of the maven-bundle-plugin. Second, I deleted the manifest-entries
> because the maven-bundle-plugin creates the manifest automatically. In the
> log4j12-api pom I switched to <packaging>bundle</packaging>. By this the
> maven-bundle-plugin creates a jar including a manifest (bundle). I added
> <inherited>true</inherited> to inherit from the parent pom. Finally, I added
> <Export-Package>${osgi.export.log4j1.2}</Export-Package> which exports the
> api and makes it accessable to other bundles.
> This should solve the issue but I didn't tested it and it may affect other
> projects.
> Roland
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