[ 
https://issues.apache.org/jira/browse/SOLR-13392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16819772#comment-16819772
 ] 

Karl Stoney commented on SOLR-13392:
------------------------------------

Sounds nasty.  I'll monkeypatch my build with your patch for now to work around 
the issue.
Ta

> Unable to start prometheus-exporter in 7x branch
> ------------------------------------------------
>
>                 Key: SOLR-13392
>                 URL: https://issues.apache.org/jira/browse/SOLR-13392
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: metrics
>    Affects Versions: 7.7.2
>            Reporter: Karl Stoney
>            Assignee: Shalin Shekhar Mangar
>            Priority: Major
>         Attachments: SOLR-13392.patch
>
>
> Hi, 
> prometheus-exporter doesn't start in branch 7x on commit 
> 7dfe1c093b65f77407c2df4c2a1120a213aef166, it does work on 
> 26b498d0a9d25626a15e25b0cf97c8339114263a so something has changed between 
> those two commits causing this.
> I am presuming it is 
> https://github.com/apache/lucene-solr/commit/e1eeafb5dc077976646b06f4cba4d77534963fa9#diff-3f7b27f0f087632739effa2aa508d77eR34
> Exception in thread "main" java.lang.NoClassDefFoundError: 
> org/apache/lucene/util/IOUtils
>         at 
> org.apache.solr.core.SolrResourceLoader.close(SolrResourceLoader.java:881)
>         at 
> org.apache.solr.prometheus.exporter.SolrExporter.loadMetricsConfiguration(SolrExporter.java:221)
>         at 
> org.apache.solr.prometheus.exporter.SolrExporter.main(SolrExporter.java:205)
> Caused by: java.lang.ClassNotFoundException: org.apache.lucene.util.IOUtils
>         at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
>         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
>         ... 3 more



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