java - OSGI org.slf4j.impl dependency -


i'm new osgi (sorry) , having few issues trying deploy package , related dependencies.

this pom:

<?xml version="1.0" encoding="utf-8"?> <project xmlns="http://maven.apache.org/pom/4.0.0"          xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"          xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">     <modelversion>4.0.0</modelversion>      <groupid>com.felix.test</groupid>     <artifactid>com.felix.test</artifactid>     <version>1.0-snapshot</version>     <packaging>bundle</packaging>      <dependencies>         <dependency>             <groupid>org.apache.felix</groupid>             <artifactid>org.osgi.core</artifactid>             <version>1.0.0</version>             <scope>provided</scope>         </dependency>         <dependency>             <groupid>javax.servlet</groupid>             <artifactid>servlet-api</artifactid>             <version>2.5</version>             <scope>provided</scope>         </dependency>         <dependency>             <groupid>org.apache.felix</groupid>             <artifactid>org.apache.felix.scr.annotations</artifactid>             <version>1.9.6</version>             <scope>provided</scope>         </dependency>         <dependency>             <groupid>org.apache.httpcomponents</groupid>             <artifactid>httpclient</artifactid>             <version>4.5</version>             <scope>provided</scope>         </dependency>         <dependency>             <groupid>net.sf.ehcache</groupid>             <artifactid>ehcache</artifactid>             <version>2.10.0</version>         </dependency>         <dependency>             <groupid>org.apache.commons</groupid>             <artifactid>commons-lang3</artifactid>             <version>3.4</version>         </dependency>     </dependencies>     <build>         <plugins>             <plugin>                 <groupid>org.apache.maven.plugins</groupid>                 <artifactid>maven-compiler-plugin</artifactid>                 <configuration>                     <source>1.5</source>                     <target>1.5</target>                 </configuration>             </plugin>             <plugin>                 <groupid>org.apache.felix</groupid>                 <artifactid>maven-bundle-plugin</artifactid>                 <version>2.5.4</version>                 <extensions>true</extensions>                 <configuration>                     <instructions>                         <export-package>                             com.felix.test.search                         </export-package>                         <bundle-symbolicname>                             ${project.artifactid}                         </bundle-symbolicname>                         <bundle-activator>                             com.felix.test.activator                         </bundle-activator>                     </instructions>                 </configuration>             </plugin>         </plugins>     </build> </project>

then i'm bundling using maven command:

mvn org.apache.felix:maven-bundle-plugin:bundleall

this successful , generates bundle 3 dependency bundles:

  • net.sf.ehcache_2.10.0.jar
  • org.apache.commons.lang3_3.4.0.jar
  • slf4j.api_1.7.7.jar

this seems ok , can install , start first 2 when try , start slf4j following exception:

org.osgi.framework.bundleexception: unable resolve slf4j.api [25](r 25.0): missing requirement [slf4j.api [25](r 25.0)] osgi.wiring.package; (&(osgi.wiring.package=org.slf4j.impl)(version>=1.6.0)) unresolved requirements: [[slf4j.api [25](r 25.0)] osgi.wiring.package; (&(osgi.wiring.package=org.slf4j.impl)(version>=1.6.0))]

i'm pretty sure i'm missing simple can't pin down. appreciated!

slf4j has unusual design (some might bad design, ahem). api bundle depends on implementation package, namely org.slf4j.impl.

you need install additional bundle implements slf4j api. there lots of choices here... example slf4j-simple basic implementation, whereas slf4j-jdk14 uses java 1.4 java.util.logging end, etc.

logback contains implementation of api.


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