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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:
-------------------------------------
Description:
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.
Roland
was:
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
> 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, Log4j-1.2, Maven-Bundle-Plugin,
> OSGi, POM
> Fix For: 2.0-beta9, 2.0
>
> Attachments: log4j2 1.2api.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.
> Roland
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