I tried to index a public maven repo at http://mirrors.ibiblio.org/pub/mirrors/maven2 and this is what I got. Note that this exception halted the indexer and no further artifacts were indexed. However the Depot UI displayed that this maven repo was 'ready', which is not quite true as it was not completely crawled. INFO: Indexing http://mirrors.ibiblio.org/pub/mirrors/maven2/activemq/activemq-itest-ejb/1.1-G1M3/ WARNING: Error reading pom model for /activemq/activemq-itest-ejb/1.1-G1M3/activemq-itest-ejb-1.1-G1M3.pom org.codehaus.plexus.util.xml.pull.XmlPullParserException: could not resolve entity named 'geronimo-spec-ejb-version' (position: START_TAG seen ...</artifactId>\n <version>&geronimo-spec-ejb-version;... @31:48) at org.codehaus.plexus.util.xml.pull.MXParser.nextImpl(MXParser.java:1282) at org.codehaus.plexus.util.xml.pull.MXParser.next(MXParser.java:1093) at org.codehaus.plexus.util.xml.pull.MXParser.nextText(MXParser.java:1058) at org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseDependency(MavenXpp3Reader.java:1290) at org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseModel(MavenXpp3Reader.java:2457) at org.apache.maven.model.io.xpp3.MavenXpp3Reader.read(MavenXpp3Reader.java:4614) at org.apache.maven.model.io.xpp3.MavenXpp3Reader.read(MavenXpp3Reader.java:4625) at org.apache.maven.embedder.MavenEmbedder.readModel(MavenEmbedder.java:258) at org.apache.maven.embedder.MavenEmbedder.readModel(MavenEmbedder.java:247) at com.iona.repository.maven.index.Maven2Indexer.createIndex(Maven2Indexer.java:165) at com.iona.repository.maven.index.Maven2Indexer.index(Maven2Indexer.java:85) at com.iona.repository.maven.osgi.RepositoryMavenServiceBean$IndexThread.run(RepositoryMavenServiceBean.java:199) INFO: Folders Searched = 4103 INFO: Known folders left to search = 13146 INFO: Number of artifacts indexed so far = 175 INFO: Indexing http://mirrors.ibiblio.org/pub/mirrors/maven2/activemq/activemq-itest-ejb/1.2/ WARNING: Error reading pom model for /activemq/activemq-itest-ejb/1.2/activemq-itest-ejb-1.2.pom org.codehaus.plexus.util.xml.pull.XmlPullParserException: could not resolve entity named 'geronimo-spec-ejb-version' (position: START_TAG seen ...</artifactId>\n <version>&geronimo-spec-ejb-version;... @31:48) at org.codehaus.plexus.util.xml.pull.MXParser.nextImpl(MXParser.java:1282) at org.codehaus.plexus.util.xml.pull.MXParser.next(MXParser.java:1093) at org.codehaus.plexus.util.xml.pull.MXParser.nextText(MXParser.java:1058) at org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseDependency(MavenXpp3Reader.java:1290) at org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseModel(MavenXpp3Reader.java:2457) at org.apache.maven.model.io.xpp3.MavenXpp3Reader.read(MavenXpp3Reader.java:4614) at org.apache.maven.model.io.xpp3.MavenXpp3Reader.read(MavenXpp3Reader.java:4625) at org.apache.maven.embedder.MavenEmbedder.readModel(MavenEmbedder.java:258) at org.apache.maven.embedder.MavenEmbedder.readModel(MavenEmbedder.java:247) at com.iona.repository.maven.index.Maven2Indexer.createIndex(Maven2Indexer.java:165) at com.iona.repository.maven.index.Maven2Indexer.index(Maven2Indexer.java:85) at com.iona.repository.maven.osgi.RepositoryMavenServiceBean$IndexThread.run(RepositoryMavenServiceBean.java:199) INFO: Folders Searched = 4104 INFO: Known folders left to search = 13145 INFO: Number of artifacts indexed so far = 175 INFO: Indexing http://mirrors.ibiblio.org/pub/mirrors/maven2/activemq/activemq-itest-ejb/1.3/ INFO: Folders Searched = 4105 INFO: Known folders left to search = 13144 INFO: Number of artifacts indexed so far = 176 INFO: Indexing http://mirrors.ibiblio.org/pub/mirrors/maven2/activemq/activemq-itest-ejb/1.4/ INFO: Completed indexing for INFO: Indexed 176 artifacts in 576,085 ms SEVERE: Error during indexing java.lang.NullPointerException at com.iona.repository.maven.index.Maven2Indexer.processPom(Maven2Indexer.java:280) at com.iona.repository.maven.index.Maven2Indexer.createIndex(Maven2Indexer.java:169) at com.iona.repository.maven.index.Maven2Indexer.index(Maven2Indexer.java:85) at com.iona.repository.maven.osgi.RepositoryMavenServiceBean$IndexThread.run(RepositoryMavenServiceBean.java:199)