Lucene-Tests fail for certain file-systems

Reported by bsc: Some lucene-tests related to index-generation or -management produce failures when executed for certain file-systems, because some data can not be deleted or overwritten. Probably one class is still accessing those files, while another one is trying to delete or overwrite them, resulting in a write.lock or redundant .nfs-files (see http://nfs.sourceforge.net/nfs-howto/ar01s02.html#whatis_nfs) in the index-folder, which will still be there after the test-runs are finished.

Test set: org.bibsonomy.lucene.index.manager.LuceneGoldStandardPublicationManagerTest
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Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 29.138 sec <<< FAILURE!
testUpdate(org.bibsonomy.lucene.index.manager.LuceneGoldStandardPublicationManagerTest)  Time elapsed: 4.266 sec  <<< ERROR!
java.io.IOException: Cannot overwrite: [...] bibsonomy-lucenesrctestresourceslucene_GoldStandardPublication-0_1.cfs
    at org.apache.lucene.store.FSDirectory.initOutput(FSDirectory.java:132)
    at org.apache.lucene.store.SimpleFSDirectory.createOutput(SimpleFSDirectory.java:55)
    at org.apache.lucene.index.CompoundFileWriter.close(CompoundFileWriter.java:147)
    at org.apache.lucene.index.DocumentsWriter.createCompoundFile(DocumentsWriter.java:665)
    at org.apache.lucene.index.IndexWriter.doFlushInternal(IndexWriter.java:3708)
    at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3565)
    at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3555)
    at org.apache.lucene.index.IndexWriter.optimize(IndexWriter.java:2320)
    at org.apache.lucene.index.IndexWriter.optimize(IndexWriter.java:2298)
    at org.apache.lucene.index.IndexWriter.optimize(IndexWriter.java:2268)
    at org.bibsonomy.lucene.util.generator.LuceneGenerateResourceIndex.createIndexFromDatabase(LuceneGenerateResourceIndex.java:237)
    at org.bibsonomy.lucene.util.generator.LuceneGenerateResourceIndex.generateIndex(LuceneGenerateResourceIndex.java:141)
    at org.bibsonomy.lucene.util.generator.LuceneGenerateResourceIndex.generateIndex(LuceneGenerateResourceIndex.java:154)
    at org.bibsonomy.lucene.index.manager.LuceneGoldStandardPublicationManagerTest.initLucene(LuceneGoldStandardPublicationManagerTest.java:90)

This problem also occurs for the LuceneUpdateManagerTest.

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