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https://issues.apache.org/jira/browse/LUCENE-5465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13908934#comment-13908934
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Uwe Schindler commented on LUCENE-5465:
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Because we respin, we should backport this also to 4.7 - it is not risky. I
don't like broken metadata.
> Solr Contrib "map-reduce" breaks Manifest of all other JAR files by adding a
> broken Main-Class attribute
> --------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-5465
> URL: https://issues.apache.org/jira/browse/LUCENE-5465
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.7
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 4.7, 4.8, 5.0
>
> Attachments: LUCENE-5465.patch, LUCENE-5465.patch
>
>
> The addition of the Solr map-reduce contrib created a new "main.class"
> property, which is used by the jarify task. Currently only the map-reduce
> plugin actually set this property, soall other generated JAR files contain
> the following line:
> {{Main-Class: $\{main.class\}}}
> This happens because the ANT property "main.class" is undefined for most
> modules. Maybe this was added for one of the modules (I assume that the
> Solr-Morphline JARs use this attribute?). We should add some if/then/else
> structure to the {{<jarify/>}} task that only sets this property, if it is
> actually defined. Otherwise remove it (I think ANT does this automatically if
> its empty, means string-empty, have to try out)
> This leads to an error if the file is double-clicked or started via {{java
> -jar}}:
> {noformat}
> C:\Users\Uwe Schindler\Desktop>java -jar lucene-core-4.7.0.jar
> Fehler: Hauptklasse ${main.class} konnte nicht gefunden oder geladen werden
> {noformat}
> I opened this issue in LUCENE, because jar files from LUCENE and SOLR are
> affected.
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