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https://issues.apache.org/jira/browse/SOLR-13392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16819716#comment-16819716
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Shalin Shekhar Mangar commented on SOLR-13392:
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Ok I can reproduce this easily. For some reason, our ivy and build.xml
configurations add lucene-core as a dependency (perhaps transitively) to the
prometheus-exporter contrib. But the runtime does not include that jar. I'll
try to see if I can get the builds to fail because of this dependency and fix
that first and then remove the lucene dependency from prometheus as it does not
need it.
> 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
>
> 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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