[ 
https://issues.apache.org/jira/browse/SOLR-13392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Ishan Chattopadhyaya resolved SOLR-13392.
-----------------------------------------
    Resolution: Invalid

Seems like some problem with compilation. Can you run "ant clean" at the root 
of the checkout and run Solr again to see if this still happens? If this 
continues after that, please reopen the issue.

> 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
>            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
> INFO  - 2019-04-10 23:52:30.979; org.apache.solr.core.SolrResourceLoader; 
> solr home defaulted to 'solr/' (could not find system property or JNDI)
> 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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