[MNG-1264] make it clearer if the index gets into a bad state

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@825415 13f79535-47bb-0310-9956-ffa450edef68

archiva-modules/archiva-base/archiva-consumers/archiva-lucene-consumers/src/main/java/org/apache/archiva/consumers/lucene/NexusIndexerConsumer.java

@@ -147,6 +147,7 @@ public class NexusIndexerConsumer
         {
             log.error( "Error queueing task: " + task + ": " + e.getMessage(), e );
         }
+        context = null;
     }
 
     public List<String> getExcludes()

archiva-modules/archiva-scheduled/src/main/java/org/apache/maven/archiva/scheduled/executors/ArchivaIndexingTaskExecutor.java

@@ -115,6 +115,11 @@ public class ArchivaIndexingTaskExecutor
             }
             else
             {
+                if ( context.getIndexDirectory() == null )
+                {
+                    throw new TaskExecutionException( "Trying to index an artifact but the context is already closed" );
+                }
+                
                 try
                 {
                     File artifactFile = indexingTask.getResourceFile();