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https://issues.apache.org/jira/browse/SOLR-2588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13062044#comment-13062044
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Erik Hatcher commented on SOLR-2588:
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Sorry - I missed this when it first got posted, and David's comment bumped
it... it was intentional to make Velocity a core component as the idea being
that we'd use it for built-in admin UI. So far we're only using it for the
/browse interface though.
I get the argument that Velocity ideally shouldn't be required to "embed" Solr
though. I'm ok with the Velocity writer creation either being in the try/catch
as Ryan posted, or pulling it out of the default writers and having it be
explicitly configured in solrconfig.xml for our example app.
> Make Velocity an optional dependency in SolrCore
> ------------------------------------------------
>
> Key: SOLR-2588
> URL: https://issues.apache.org/jira/browse/SOLR-2588
> Project: Solr
> Issue Type: Wish
> Affects Versions: 3.2
> Reporter: Gunnar Wagenknecht
> Priority: Minor
> Fix For: 3.4, 4.0
>
>
> In 1.4. it was fine to run Solr without Velocity on the classpath. However,
> in 3.2. SolrCore won't load because of a hard reference to the Velocity
> response writer in a static initializer.
> {noformat}
> ... ERROR org.apache.solr.core.CoreContainer -
> java.lang.NoClassDefFoundError: org/apache/velocity/context/Context
> at org.apache.solr.core.SolrCore.<clinit>(SolrCore.java:1447)
> at org.apache.solr.core.CoreContainer.create(CoreContainer.java:463)
> at org.apache.solr.core.CoreContainer.load(CoreContainer.java:316)
> at org.apache.solr.core.CoreContainer.load(CoreContainer.java:207)
> {noformat}
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