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https://issues.apache.org/jira/browse/LUCENE-3946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245902#comment-13245902
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Michael McCandless commented on LUCENE-3946:
--------------------------------------------

I passed --execdebug to ant, and when it fails (w/ the builtin Fedora ant) I 
get this:
{noformat}
exec "/usr/local/src/jdk1.6.0_21/bin/java" -classpath 
"/usr/share/java/ant.jar:/usr/share/java/ant-launcher.jar:/usr/share/java/jaxp_parser_impl.jar:/usr/share/java/xml-commons-apis.jar:/usr/share/java/antlr.jar:/usr/share/java/ant/ant-antlr.jar:/usr/share/java/bcel.jar:/usr/share/java/ant/ant-apache-bcel.jar:/usr/share/java/ant.jar:/usr/share/java/oro.jar:/usr/share/java/ant/ant-apache-oro.jar:/usr/share/java/regexp.jar:/usr/share/java/ant/ant-apache-regexp.jar:/usr/share/java/xml-commons-resolver.jar:/usr/share/java/ant/ant-apache-resolver.jar:/usr/share/java/jakarta-commons-logging.jar:/usr/share/java/ant/ant-commons-logging.jar:/usr/share/java/javamail.jar:/usr/share/java/jaf.jar:/usr/share/java/ant/ant-javamail.jar:/usr/share/java/jdepend.jar:/usr/share/java/ant/ant-jdepend.jar:/usr/share/java/junit.jar:/usr/share/java/ant/ant-junit.jar:/usr/share/java/ant/ant-nodeps.jar:/usr/share/java/ant/ant-swing.jar:/usr/share/java/jaxp_transform_impl.jar:/usr/share/java/ant/ant-trax.jar:/usr/share/java/xalan-j2-serializer.jar:/usr/local/src/jdk1.6.0_21/lib/tools.jar"
 -Dant.home="/usr/share/ant" -Dant.library.dir="/usr/share/ant/lib" 
org.apache.tools.ant.launch.Launcher -cp ""
{noformat}

and then when I switch to the working ant:
{noformat}
exec "/usr/local/src/jdk1.6.0_21/jre/bin/java" -classpath 
"/usr/local/src/apache-ant-1.8.2//lib/ant-launcher.jar" 
-Dant.home="/usr/local/src/apache-ant-1.8.2/" 
-Dant.library.dir="/usr/local/src/apache-ant-1.8.2//lib" 
org.apache.tools.ant.launch.Launcher -cp ""
{noformat}

                
> 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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