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https://issues.apache.org/jira/browse/SOLR-2588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13062016#comment-13062016
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David Smiley commented on SOLR-2588:
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I'm surprised velocity became a core dependency, but nonetheless I think it
should be possible to use Solr in an embedded fashion without pulling in
extraneous dependencies like velocity and others. What if these response
writers were initialized on-demand? This would increase startup time &
decrease memory usage just a little since most people aren't actually going to
use all response writers that Solr supports. I'm willing to put together a
patch.
> 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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