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https://issues.apache.org/jira/browse/MINDEXER-106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16264782#comment-16264782
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Cservenak, Tamas commented on MINDEXER-106:
-------------------------------------------

Aether was sonatype first, then donated to eclipse. Similar issue like maven 
3.0 vs 3.1+ (affected by package change).

Indexer is will use {{org.apache.maven.resolver:maven-resolver-api}} (that due 
to compatibility uses {{org.eclipse.aether}} package name.

> ClassNotFoundException 
> (org.sonatype.aether.version.InvalidVersionSpecificationException) under 
> recent Maven versions
> ---------------------------------------------------------------------------------------------------------------------
>
>                 Key: MINDEXER-106
>                 URL: https://issues.apache.org/jira/browse/MINDEXER-106
>             Project: Maven Indexer
>          Issue Type: Bug
>    Affects Versions: 5.1.1
>         Environment: Apache Maven 3.5.0 
> (ff8f5e7444045639af65f6095c62210b5713f426; 2017-04-03T21:39:06+02:00)
>            Reporter: Andreas Sewe
>             Fix For: 6.0
>
>
> It is impossible to use the latest released {{indexer-core}} (version 5.1.1) 
> in a mojo executing under a recent version of Maven (3.5.0):
> {noformat}
> Caused by: java.lang.NoClassDefFoundError: 
> org/sonatype/aether/version/InvalidVersionSpecificationException
>       at 
> org.apache.maven.index.context.IndexUtils.constructArtifactInfo(IndexUtils.java:111)
>       at 
> org.apache.maven.index.context.IndexUtils.updateDocument(IndexUtils.java:135)
>       at 
> org.apache.maven.index.updater.IndexDataReader.readIndex(IndexDataReader.java:92)
>       at 
> org.apache.maven.index.updater.DefaultIndexUpdater.unpackIndexData(DefaultIndexUpdater.java:509)
>       at 
> org.apache.maven.index.updater.DefaultIndexUpdater.loadIndexDirectory(DefaultIndexUpdater.java:197)
>       at 
> org.apache.maven.index.updater.DefaultIndexUpdater.access$300(DefaultIndexUpdater.java:76)
>       at 
> org.apache.maven.index.updater.DefaultIndexUpdater$LuceneIndexAdaptor.setIndexFile(DefaultIndexUpdater.java:642)
>       at 
> org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:862)
>       at 
> org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:157)
>       ...
> Caused by: java.lang.ClassNotFoundException: 
> org.sonatype.aether.version.InvalidVersionSpecificationException
>       at 
> org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
>       at 
> org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
>       at 
> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
>       at 
> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
> {noformat}



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