Add Detail To Configuration XML Parsing Error Messages
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                 Key: SOLR-991
                 URL: https://issues.apache.org/jira/browse/SOLR-991
             Project: Solr
          Issue Type: Improvement
    Affects Versions: 1.4
         Environment: jdk 1.6+, Tomcat 5.x, 6.x
            Reporter: Michael Henson
            Priority: Minor


When there is a parsing error in configuration xml files, the error message 
does not specify which file was being processed or what line caused the parse 
failure:

=== snip ===
[Fatal Error] :33:54: The string "--" is not permitted within comments.
Jan 27, 2009 6:07:54 PM org.apache.solr.common.SolrException log
SEVERE: org.xml.sax.SAXParseException: The string "--" is not permitted within 
comments.
        at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown 
Source)
        at 
com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown 
Source)
        at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
        at org.apache.solr.core.Config.<init>(Config.java:104)
        at org.apache.solr.core.SolrConfig.<init>(SolrConfig.java:111)
        at org.apache.solr.core.CoreContainer.create(CoreContainer.java:338)
        at org.apache.solr.core.CoreContainer.load(CoreContainer.java:217)
=== snip ===

As a result, finding minor typos in the config files can take quite a bit of 
user time. In this case the specific error was an extraneous space in the 
closing xml comment tag, "-- >" instead of "-->".


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