如何正确使用Nexus和Maven / Jenkins作为第三方库（不在Maven存储库中）和必要的p2存储库

我们使用Jenkins / Maven进行BuildManagement和持续集成 . 管理第三方库应该由我们设置的Nexus服务器处理 .

• 有问题的第三方库是org.eclipse.bpmn2 0.7.0

• 据我们所知，此库未托管在远程Maven存储库中

• 我们已将第三方库上传到托管的Nexus第三方存储库

• 我们有一些代理Nexus存储库指向Web（工作）

现在到（也许）问题部分：

• 我们的项目由Eclipse插件组成

• 因此我们需要访问eclipse p2存储库

• Manifest.MF中描述了对第三方库的依赖性

• Nexus Open Source不支持p2存储库

• 因此，我们必须将Eclipse p2存储库添加到项目POM中

首先，（可能）来自Jenkins使用的Maven的settings.xml中的相关设置：

<localRepository>/var/lib/jenkins/local_repo</localRepository>

我们有一个本地Maven存储库 .

Maybe important: How do the local Maven repo and Nexus work together? Is the local repository redundant? Could it conflict with Nexus libraries? Or does Maven only load the dependencies from Nexus and store in the local repository? Should we have emptied it after installing Nexus?

<mirrors>
  <mirror>
  <!--This sends everything else to /public -->
  <id>nexus</id>
  <mirrorOf>*</mirrorOf>
  <url>http://localhost:8082/nexus/content/groups/public</url>
  </mirror>
</mirrors>

<profile>
    <id>nexus</id>
<!--Enable snapshots for the built central repo to direct
    all requests to nexus via the mirror -->
    <repositories>
        <repository>
            <id>central</id>
            <url>http://central</url>
            <releases><enabled>true</enabled></releases>
            <snapshots><enabled>true</enabled></snapshots>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>central</id>
            <url>http://central</url>
            <releases><enabled>true</enabled></releases>
            <snapshots><enabled>true</enabled></snapshots>
        </pluginRepository>
    </pluginRepositories>
</profile>

<activeProfiles>
    <activeProfile>nexus</activeProfile>
</activeProfiles>

您可能已经看到，我们现在使用默认的nexus配置 . 现在到相关项目POM内容：

<repositories>
<!--
    <repository>
        <id>UML2</id>
        <layout>p2</layout>
        <url>http://download.eclipse.org/modeling/mdt/updates/releases/</url>
    </repository>
-->
    <repository>
        <id>indigo</id>
        <layout>p2</layout>
        <url>http://download.eclipse.org/releases/indigo</url>
    </repository>
</repositories>

我们尝试将p2存储库合并到Nexus中，但随后发现开源版本无法处理p2存储库 . 所以我们需要在项目POM中将它们作为存储库以及Nexus . MDT存储库已被注释掉，因为它似乎没有它 .

对org.eclipse.bpmn2的依赖是在相应插件的manifest.MF中使用它：

Require-Bundle: 
 org.eclipse.bpmn2;bundle-version="0.7.0";visibility:=reexport

该库已上传至Nexus（使用GAV参数）：

• GroupID：org.eclipse

• ArtifactID：org.eclipse.bpmn2

• 版本：0.7.0.201111021300

• 包装： jar

MAYBE IMPORTANT: The classifier was left empty. What should be entered here?

使用-e -X启动Jenkins作业和Maven时，输出如下：

[DEBUG] P2resolver.addMavenProject de.some.tool:pom:2.0
[INFO] Adding repository (cached) http://download.eclipse.org/releases/indigo
[DEBUG] Added p2 repository indigo (http://download.eclipse.org/releases/indigo)
[INFO] Cannot complete the request.  Generating details.
[INFO] Cannot complete the request.  Generating details.
[INFO] {org.osgi.framework.executionenvironment=OSGi/Minimum-1.0,OSGi/Minimum-1.1, osgi.ws=gtk, osgi.arch=x86, osgi.os=linux, org.eclipse.update.install.features=true, org.osgi.framework.system.packages=}
[ERROR] Cannot resolve project dependencies:
[ERROR]   Software being installed: de.modeltype.bpmn2 1.0.0.qualifier
[ERROR]   Missing requirement: de.modeltype.bpmn2 1.0.0.qualifier requires 'bundle org.eclipse.bpmn2 0.7.0' but it could not be found
[ERROR] 
mavenExecutionResult exceptions not empty
message : Internal error: java.lang.RuntimeException: "No solution found because the problem is unsatisfiable.": ["Unable to satisfy dependency from de.modeltype.bpmn2 1.0.0.qualifier to bundle org.eclipse.bpmn2 0.7.0.", "No solution found because the problem is unsatisfiable."]
cause : "No solution found because the problem is unsatisfiable.": ["Unable to satisfy dependency from de.modeltype.bpmn2 1.0.0.qualifier to bundle org.eclipse.bpmn2 0.7.0.", "No solution found because the problem is unsatisfiable."]
Stack trace : 
org.apache.maven.InternalErrorException: Internal error: java.lang.RuntimeException: "No solution found because the problem is unsatisfiable.": ["Unable to satisfy dependency from de.modeltype.bpmn2 1.0.0.qualifier to bundle org.eclipse.bpmn2 0.7.0.", "No solution found because the problem is unsatisfiable."]
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:168)
    at org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:79)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
    at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:158)
    at hudson.maven.Maven3Builder.call(Maven3Builder.java:104)
    at hudson.maven.Maven3Builder.call(Maven3Builder.java:70)
    at hudson.remoting.UserRequest.perform(UserRequest.java:118)
    at hudson.remoting.UserRequest.perform(UserRequest.java:48)
    at hudson.remoting.Request$2.run(Request.java:287)
    at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.RuntimeException: "No solution found because the problem is unsatisfiable.": ["Unable to satisfy dependency from de.modeltype.bpmn2 1.0.0.qualifier to bundle org.eclipse.bpmn2 0.7.0.", "No solution found because the problem is unsatisfiable."]
    at org.eclipse.tycho.p2.impl.resolver.ProjectorResolutionStrategy.resolve(ProjectorResolutionStrategy.java:106)
    at org.eclipse.tycho.p2.impl.resolver.P2ResolverImpl.resolveProject(P2ResolverImpl.java:102)
    at org.eclipse.tycho.p2.impl.resolver.P2ResolverImpl.resolveProject(P2ResolverImpl.java:69)
    at org.eclipse.tycho.p2.resolver.P2TargetPlatformResolver.doResolvePlatform(P2TargetPlatformResolver.java:342)
    at org.eclipse.tycho.p2.resolver.P2TargetPlatformResolver.resolvePlatform(P2TargetPlatformResolver.java:162)
    at org.eclipse.tycho.core.resolver.DefaultTychoDependencyResolver.resolveProject(DefaultTychoDependencyResolver.java:85)
    at org.eclipse.tycho.core.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:91)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:273)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    ... 19 more
channel stopped
Finished: FAILURE

我们做错了什么？