Maven：优先于清单依赖而不是pom.xml依赖

Question

I have project which requires one library. This lib is already in the local repro. I told the project through its pom.xml that it depends on this lib like this:

<?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>
   <parent>
      <groupId>de.mygui</groupId>
      <artifactId>de.mygui.app.releng</artifactId>
      <relativePath>../de.mygui.app.releng/pom.xml</relativePath>
      <version>1.0.0-SNAPSHOT</version>
   </parent>
   <groupId>de.mygui</groupId>
   <artifactId>de.mygui.map</artifactId>
   <version>1.0.0-SNAPSHOT</version>
   <packaging>eclipse-plugin</packaging>
   <dependencies>
      <dependency>
         <groupId>common</groupId>
         <artifactId>my.util.geo</artifactId>
         <version>1.0.0</version>
      </dependency>
   </dependencies>
</project>

and the projects manifest looks like this:

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: gui map
Bundle-SymbolicName: de.mygui.map;singleton:=true
Bundle-Version: 1.0.0.qualifier
Bundle-RequiredExecutionEnvironment: JavaSE-1.8
Import-Package: my.util.geo;version="2.0.0"

The my.util.geo manifest:

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Geo
Bundle-SymbolicName: my.util.geo
Bundle-Version: 1.0.0
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Export-Package: my.util.geo
Require-Bundle: org.proj4j;bundle-version="0.1.0"

When running the parent POM to compile everything (also other required projects) I get the following error:

[ERROR] Cannot resolve project dependencies:
[ERROR]   Software being installed: de.mygui.app.feature.feature.group 1.0.0.qualifier
[ERROR]   Missing requirement: de.mygui.map 1.0.0.qualifier requires 'package my.util.geo 2.0.0' but it could not be found
[ERROR]   Cannot satisfy dependency: de.mygui.app.feature.feature.group 1.0.0.qualifier depends on: de.mygui.map 0.0.0
[ERROR] 
[ERROR] See http://wiki.eclipse.org/Tycho/Dependency_Resolution_Troubleshooting for help.
[ERROR] Cannot resolve dependencies of MavenProject: de.mygui:de.mygui.app.feature:1.0.0-SNAPSHOT @ /home/myuser/dev/gui/de.mygui.app.feature/pom.xml: See log for details -> [Help 1]
org.apache.maven.MavenExecutionException: Cannot resolve dependencies of MavenProject: de.mygui:de.mygui.app.feature:1.0.0-SNAPSHOT @ /home/myuser/dev/gui/de.mygui.app.feature/pom.xml
    at org.eclipse.tycho.core.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:100)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:274)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.eclipse.tycho.artifacts.DependencyResolutionException: Cannot resolve dependencies of MavenProject: de.mygui:de.mygui.app.feature:1.0.0-SNAPSHOT @ /home/myuser/dev/gui/de.mygui.app.feature/pom.xml
    at org.eclipse.tycho.p2.resolver.P2ResolverImpl.resolveDependencies(P2ResolverImpl.java:202)
    at org.eclipse.tycho.p2.resolver.P2ResolverImpl.resolveDependencies(P2ResolverImpl.java:116)
    at org.eclipse.tycho.p2.resolver.P2DependencyResolver.doResolveDependencies(P2DependencyResolver.java:367)
    at org.eclipse.tycho.p2.resolver.P2DependencyResolver.resolveDependencies(P2DependencyResolver.java:335)
    at org.eclipse.tycho.core.resolver.DefaultTychoResolver.resolveProject(DefaultTychoResolver.java:117)
    at org.eclipse.tycho.core.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:95)
    ... 13 more
Caused by: org.eclipse.tycho.p2.util.resolution.ResolverException: See log for details
    at org.eclipse.tycho.p2.util.resolution.ProjectorResolutionStrategy.resolve(ProjectorResolutionStrategy.java:88)
    at org.eclipse.tycho.p2.util.resolution.AbstractResolutionStrategy.resolve(AbstractResolutionStrategy.java:42)
    at org.eclipse.tycho.p2.resolver.P2ResolverImpl.resolveDependencies(P2ResolverImpl.java:195)
    ... 18 more

To me it looks like Maven looks first into the manifest and afterwards in the POM for its dependencies. As you can see I changed the version numbers of my.util.geo to verify that the manifest is used before the POM. Never the less even if I have the same versions in both the manifest and the POM, Maven is still not able to resolve the dependency.

What can I do to fix this problem ?

Answer 1

It turned out that the mainfest of the jar (of my.util.geo ) which was put into the local repro was the default manifest of the maven archiver . So I needed to edit my build script for my.util.geo lib to include all necessary values

<plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-jar-plugin</artifactId>
   <version>2.1</version>
   <configuration>
      <archive>
         <manifest>
            <addClasspath>true</addClasspath>
            <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
            <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
         </manifest>
         <manifestEntries>
            <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
            <Bundle-Version>${project.version}</Bundle-Version>
            <Bundle-ClassPath>.</Bundle-ClassPath>
            <Export-Package>my.util.geo</Export-Package>
         </manifestEntries>
      </archive>
   </configuration>
</plugin>