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https://issues.apache.org/jira/browse/SOLR-2588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13066268#comment-13066268
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Hoss Man commented on SOLR-2588:
--------------------------------
-1
I re-iterate...
bq. either [velocity is] a core feature and dependency, or it's an optional
contrib.
we should not claim it is a core feature, but then silently succeed even if
it's not found at runtime. That will only lead to confusion for users/plugin
devs who see that it works by default in (w/o any special <lib/>
loading/config) in their solr instance, and then in other instances it's just
not there w/o any warning/error on startup.
if it's a core feature then it's a core feature that people should be able to
rely on always working with *any* solr instance (war or otherwise) and we
should fail hard and fast if it's not found.
if there is going to any ambiguity or about whether it is/isn't available then
it must be rolled back to a contrib and people who want it should explicitly
say "i want this" using a <lib/> declaration.
> 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
> Assignee: David Smiley
> Priority: Minor
> Fix For: 3.4, 4.0
>
> Attachments: SOLR-2588_Don_t_fail_if_velocity_libs_not_present_.patch
>
>
> 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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