This error only occurs when executing the ExtractOccsFromWikipedia process on English Wkikpedia, the other process in the index.sh works just fine.
However, the process did give out some output, about 3686 lines, the following is the first line:
Anarchism-p2l1 Family_resemblance family resemblance Anarchism is a political philosophy which considers the state undesirable, unnecessary and harmful, and instead promotes a stateless society, or anarchy. It seeks to diminish or even abolish authority in the conduct of human relations. Anarchists may widely disagree on what additional criteria are required in anarchism. Oxford Companion to Philosophy says, "there is no single defining position that all anarchists hold, and those considered anarchists at best share a certain family resemblance." 481
Apache Maven 2.2.1 (r801777; 2009-08-07 03:16:01+0800)
Java version: 1.7.0
Java home: /opt/java/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux" version: "3.3.5-1-arch" arch: "amd64" Family: "unix"
The following is the full stack trace of the error.
[hector@hector-arch index]$ mvn scala:run -DmainClass=org.dbpedia.spotlight.lucene.index.ExtractOccsFromWikipedia "-DaddArgs=$INDEX_CONFIG_FILE|output/occs.tsv"
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building DBpedia Spotlight Indexing
[INFO] task-segment: [scala:run]
[INFO] ------------------------------------------------------------------------
[INFO] Preparing scala:run
[INFO] [install:install-file {execution: install-weka-jar}]
[INFO] Installing /home/hector/Researches/nlp/DBpedia_Spotlight/dbpedia-spotlight/index/../lib/weka-trunk.jar to /home/hector/.m2/repository/weka/weka/3.7.3/weka-3.7.3.jar
[INFO] [resources:resources {execution: default-resources}]
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/hector/Researches/nlp/DBpedia_Spotlight/dbpedia-spotlight/index/src/main/resources
[INFO] [scala:add-source {execution: scala-compile-first}]
[INFO] Add Source directory: /home/hector/Researches/nlp/DBpedia_Spotlight/dbpedia-spotlight/index/src/main/scala
[INFO] Add Test Source directory: /home/hector/Researches/nlp/DBpedia_Spotlight/dbpedia-spotlight/index/src/test/scala
[INFO] [scala:compile {execution: scala-compile-first}]
[INFO] Checking for multiple versions of scala
[INFO] includes = [**/*.scala,**/*.java,]
[INFO] excludes = []
[INFO] Nothing to compile - all classes are up to date
[INFO] [compiler:compile {execution: default-compile}]
[INFO] Nothing to compile - all classes are up to date
[INFO] [resources:testResources {execution: default-testResources}]
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/hector/Researches/nlp/DBpedia_Spotlight/dbpedia-spotlight/index/src/test/resources
[INFO] [compiler:testCompile {execution: default-testCompile}]
[INFO] No sources to compile
[INFO] [scala:run {execution: default-cli}]
[INFO] Checking for multiple versions of scala
INFO 2012-05-18 14:10:10,642 main [IndexingConfiguration] - Loading configuration file ../conf/indexing.properties
INFO 2012-05-18 14:10:10,748 main [ExtractOccsFromWikipedia$] - Loading concept URIs from output/conceptURIs.list...
INFO 2012-05-18 14:10:17,567 main [ExtractOccsFromWikipedia$] - Loading redirects transitive closure from output/redirects_tc.tsv...
INFO 2012-05-18 14:10:27,077 main [FileOccurrenceSource$] - Writing occurrences to file output/occs.tsv ...
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org_scala_tools_maven_executions.MainHelper.runMain(MainHelper.java:161)
at org_scala_tools_maven_executions.MainWithArgsInFile.main(MainWithArgsInFile.java:26)
Caused by: java.lang.NoSuchMethodError: scala.collection.immutable.StringOps.slice(II)Ljava/lang/String;
at org.dbpedia.spotlight.io.DisambiguationContextSource$.getOccurrence(DisambiguationContextSource.scala:153)
at org.dbpedia.spotlight.io.AllOccurrenceSource$AllOccurrenceSource$$anonfun$foreach$1$$anonfun$apply$1.apply(AllOccurrenceSource.scala:101)
at org.dbpedia.spotlight.io.AllOccurrenceSource$AllOccurrenceSource$$anonfun$foreach$1$$anonfun$apply$1.apply(AllOccurrenceSource.scala:97)
at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
at scala.collection.immutable.List.foreach(List.scala:45)
at org.dbpedia.spotlight.io.AllOccurrenceSource$AllOccurrenceSource$$anonfun$foreach$1.apply(AllOccurrenceSource.scala:97)
at org.dbpedia.spotlight.io.AllOccurrenceSource$AllOccurrenceSource$$anonfun$foreach$1.apply(AllOccurrenceSource.scala:78)
at org.dbpedia.extraction.sources.WikipediaDumpParser.readPage(WikipediaDumpParser.java:218)
at org.dbpedia.extraction.sources.WikipediaDumpParser.readPages(WikipediaDumpParser.java:159)
at org.dbpedia.extraction.sources.WikipediaDumpParser.readDump(WikipediaDumpParser.java:107)
at org.dbpedia.extraction.sources.WikipediaDumpParser.run(WikipediaDumpParser.java:87)
at org.dbpedia.extraction.sources.XMLSource$XMLFileSource.foreach(XMLSource.scala:40)
at org.dbpedia.spotlight.io.AllOccurrenceSource$AllOccurrenceSource.foreach(AllOccurrenceSource.scala:78)
at org.dbpedia.spotlight.filter.Filter$FilteredOccs.foreach(Filter.scala:53)
at org.dbpedia.spotlight.filter.Filter$FilteredOccs.foreach(Filter.scala:53)
at org.dbpedia.spotlight.filter.Filter$FilteredOccs.foreach(Filter.scala:53)
at org.dbpedia.spotlight.io.FileOccurrenceSource$.writeToFile(FileOccurrenceSource.scala:59)
at org.dbpedia.spotlight.lucene.index.ExtractOccsFromWikipedia$.main(ExtractOccsFromWikipedia.scala:79)
at org.dbpedia.spotlight.lucene.index.ExtractOccsFromWikipedia.main(ExtractOccsFromWikipedia.scala)
... 6 more
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] wrap: org.apache.commons.exec.ExecuteException: Process exited with an error: 240(Exit value: 240)
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 24 seconds
[INFO] Finished at: Fri May 18 14:10:33 HKT 2012
[INFO] Final Memory: 34M/344M
[INFO] ------------------------------------------------------------------------