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https://issues.apache.org/jira/browse/SOLR-13392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17209031#comment-17209031
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David Smiley commented on SOLR-13392:
-------------------------------------
bq. Do we have a test that tries to launch the exporter to avoid such bugs in
the future?
Apparently not! Docker is perfect for such a test, and we finally have Docker
in our source tree but not yet Jenkins setup (whatever that may be).
BTW I just filed SOLR-14915 to change the exporter to not depend on solr-core,
which I think is crazy.
> 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
> Components: metrics
> Affects Versions: 7.7.2
> Reporter: Karl Stoney
> Assignee: Shalin Shekhar Mangar
> Priority: Major
> Fix For: 7.7.2, 8.1, master (9.0)
>
> 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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