我正在尝试从更新站点安装一个插件以eclipse。但是，不知何故，这不起作用（可能是工具已终止对更新站点的支持）。虽然，我从github找到了插件的源代码（但它不是编译版本）。我可以将其下载为zip文件。但是，我面临与安装相关的问题。它在不同的文件夹中包含许多plugin.xml文件。但是，我不确定使用哪一个。

这是插件源代码的url。

请帮助从源代码安装eclipse插件的步骤。

@ChandrayyaGK：我已经按照你的回答中提到的步骤进行了。我面临以下错误。

[INFO] Fetching org.eclipse.graphiti_0.11.4.v20150701-1432.jar.pack.gz from http://archive.eclipse.org/graphiti/updates/0.11.4/plugins/ (0B of 83.9kB at 0B/s)
[ERROR] Internal error: java.lang.NullPointerException -> [Help 1]
org.apache.maven.InternalErrorException: Internal error: java.lang.NullPointerException
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:164)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:555)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        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: java.lang.NullPointerException
        at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.downloadArtifact(SimpleArtifactRepository.java:665)
        at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.downloadArtifact(SimpleArtifactRepository.java:590)
        at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.getArtifact(SimpleArtifactRepository.java:724)
        at org.eclipse.tycho.repository.p2base.artifact.repository.RepositoryArtifactProvider.getArtifactFromOneMirror(RepositoryArtifactProvider.java:209)
        at org.eclipse.tycho.repository.p2base.artifact.repository.RepositoryArtifactProvider.getArtifactFromAnyMirror(RepositoryArtifactProvider.java:192)
        at org.eclipse.tycho.repository.p2base.artifact.repository.RepositoryArtifactProvider.access$1(RepositoryArtifactProvider.java:187)
        at org.eclipse.tycho.repository.p2base.artifact.repository.RepositoryArtifactProvider$1.perform(RepositoryArtifactProvider.java:167)
        at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.getArtifact(SimpleArtifactRepository.java:708)
        at org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.getArtifacts(SimpleArtifactRepository.java:779)
        at org.eclipse.tycho.repository.p2base.artifact.repository.RepositoryArtifactProvider.getArtifactFromAnyChildRepository(RepositoryArtifactProvider.java:179)
        at org.eclipse.tycho.repository.p2base.artifact.repository.RepositoryArtifactProvider.getArtifactFromAnyFormatAvailableInRepository(RepositoryArtifactProvider.java:149)
        at org.eclipse.tycho.repository.p2base.artifact.repository.RepositoryArtifactProvider.getArtifactFromAnySource(RepositoryArtifactProvider.java:135)
        at org.eclipse.tycho.repository.p2base.artifact.provider.CompositeArtifactProviderBaseImpl.getArtifact(CompositeArtifactProviderBaseImpl.java:50)
        at org.eclipse.tycho.repository.local.MirroringArtifactProvider.downloadCanonicalArtifact(MirroringArtifactProvider.java:236)
        at org.eclipse.tycho.repository.local.MirroringArtifactProvider.downloadMostSpecificNeededFormatOfArtifact(MirroringArtifactProvider.java:229)
        at org.eclipse.tycho.repository.local.MirroringArtifactProvider.downloadArtifact(MirroringArtifactProvider.java:214)
        at org.eclipse.tycho.repository.local.MirroringArtifactProvider.makeOneFormatLocallyAvailable(MirroringArtifactProvider.java:203)
        at org.eclipse.tycho.repository.local.MirroringArtifactProvider.makeLocallyAvailable(MirroringArtifactProvider.java:174)
        at org.eclipse.tycho.repository.local.MirroringArtifactProvider.getArtifactFile(MirroringArtifactProvider.java:118)
        at org.eclipse.tycho.repository.p2base.artifact.provider.CompositeArtifactProvider.getArtifactFile(CompositeArtifactProvider.java:70)
        at org.eclipse.tycho.p2.target.TargetPlatformBaseImpl.getLocalArtifactFile(TargetPlatformBaseImpl.java:93)
        at org.eclipse.tycho.p2.resolver.P2ResolverImpl.addUnit(P2ResolverImpl.java:251)
        at org.eclipse.tycho.p2.resolver.P2ResolverImpl.toResolutionResult(P2ResolverImpl.java:214)
        at org.eclipse.tycho.p2.resolver.P2ResolverImpl.resolveDependencies(P2ResolverImpl.java:206)
        at org.eclipse.tycho.p2.resolver.P2ResolverImpl.resolveDependencies(P2ResolverImpl.java:113)
        at org.eclipse.tycho.p2.resolver.P2DependencyResolver.doResolveDependencies(P2DependencyResolver.java:360)
        at org.eclipse.tycho.p2.resolver.P2DependencyResolver.resolveDependencies(P2DependencyResolver.java:333)
        at org.eclipse.tycho.core.resolver.DefaultTychoResolver.resolveProject(DefaultTychoResolver.java:117)
        at org.eclipse.tycho.core.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:77)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:271)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:152)
        ... 11 more
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/InternalErrorException

经过进一步调查，我发现原因是机器环境特性。

<environment>
                        <os>macosx</os>
                        <ws>cocoa</ws>
                        <arch>x86_64</arch>
                    </environment>

我已经把它改成了跟随，而且很有效。

<environment>
                            <os>win32</os>
                            <ws>win32</ws>
                            <arch>x86</arch>
                        </environment>