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https://issues.apache.org/jira/browse/LUCENE-3946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hoss Man updated LUCENE-3946:
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    Attachment: LUCENE-3946.patch

patch that updates the ivy-availability-check to include:
* a mention of --noconfig
* a link to the wiki (where we'd need to add some content)
* an echo of the classpath

...i'm using ${java.class.path} here because from what i can tell doing testing 
with "-nouserlib" that's the right classpath to look at -- but i'm a little 
worried based on Shawn's comment in LUCENE-3930 that when he added an echo of 
${java.class.path} he did in fact see the ~/.ant/lib jar in there.

I'm hoping Shawn and McCandless (who also mentioned being able to reproduce 
this with a stock Fedora install of ant) can verify that they get 
consistent/useful behavior when running things like...

* "ant --noconfig resolve" (should work for anyone using default ant)
* "ant resolve" (should work for most, but expect to fail on these fedora 
systems because of packaged /etc/ant.conf, but our failure message should show 
a classpath that clearly indicates ~/.ant/lib/ivy.jar isn't in there)
* "ant --noconfig resolve" (should work for anyone)
* "ant -nouserlib resolve" (should fail for anyone, our failure message should 
show a classpath that clearly indicates ~/.ant/lib/ivy.jar isn't in there)
                
> improve docs & ivy verification output to explain classpath problems and 
> mention "--noconfig"
> ---------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3946
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3946
>             Project: Lucene - Java
>          Issue Type: Task
>    Affects Versions: 3.6
>            Reporter: Hoss Man
>            Assignee: Hoss Man
>             Fix For: 4.0
>
>         Attachments: LUCENE-3946.patch
>
>
> offshoot of LUCENE-3930, where shawn reported...
> {quote}
> I can't get either branch_3x or trunk to build now, on a system that used to 
> build branch_3x without complaint.  It
> says that ivy is not available, even after doing "ant ivy-bootstrap" to 
> download ivy into the home directory.
> Specifically I am trying to build solrj from trunk, but I can't even get 
> "ant" in the root directory of the checkout
> to work.  I'm on CentOS 6 with oracle jdk7 built using the city-fan.org 
> SRPMs.  Ant (1.7.1) and junit are installed
> from package repositories.  Building a checkout of lucene_solr_3_5 on the 
> same machine works fine.
> {quote}
> The root cause is that ant's global configs can be setup to ignore the users 
> personal lib dir.  suggested work arround is to run "ant --noconfig" but we 
> should also try to give the user feedback in our failure about exactly what 
> classpath ant is currently using (because apparently ${java.class.path} is 
> not actually it)

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