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java.lang.AbstractMethodError: 	at java.lang.String.valueOf(Unknown Source)	at org.apache.commons.logging.impl.Jdk14Logger.warn(Jdk14Logger.java:271)	at org.apache.pdfbox.util.PDFStreamEngine.processOperator(PDFStreamEngine.java:570)	at org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:268)	at org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:235)	at org.apache.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:215)	at org.apache.pdfbox.util.PDFTextStripper.processPage(PDFTextStripper.java:460)	at org.apache.pdfbox.util.PDFTextStripper.processPages(PDFTextStripper.java:385)	at org.apache.pdfbox.util.PDFTextStripper.writeText(PDFTextStripper.java:344)	at net.sourceforge.docfetcher.model.parse.PdfParser.parse(PdfParser.java:115)	at net.sourceforge.docfetcher.model.parse.ParseService.doParse(ParseService.java:265)	at net.sourceforge.docfetcher.model.parse.ParseService.parse(ParseService.java:233)	at net.sourceforge.docfetcher.model.index.file.FileContext.index(FileContext.java:146)	at net.sourceforge.docfetcher.model.index.file.FileIndex$1.handleFile(FileIndex.java:295)	at net.sourceforge.docfetcher.model.index.file.HtmlFileLister.runWithHtmlPairing(HtmlFileLister.java:124)	at net.sourceforge.docfetcher.model.index.file.HtmlFileLister.doRun(HtmlFileLister.java:57)	at net.sourceforge.docfetcher.util.Stoppable.run(Stoppable.java:57)	at net.sourceforge.docfetcher.model.index.file.FileIndex.visitDirOrZip(FileIndex.java:282)	at net.sourceforge.docfetcher.model.index.file.FileIndex.access$200(FileIndex.java:51)	at net.sourceforge.docfetcher.model.index.file.FileIndex$1.handleDir(FileIndex.java:393)	at net.sourceforge.docfetcher.model.index.file.HtmlFileLister.runWithHtmlPairing(HtmlFileLister.java:145)	at net.sourceforge.docfetcher.model.index.file.HtmlFileLister.doRun(HtmlFileLister.java:57)	at net.sourceforge.docfetcher.util.Stoppable.run(Stoppable.java:57)	at net.sourceforge.docfetcher.model.index.file.FileIndex.visitDirOrZip(FileIndex.java:282)	at net.sourceforge.docfetcher.model.index.file.FileIndex.access$200(FileIndex.java:51)	at net.sourceforge.docfetcher.model.index.file.FileIndex$1.handleDir(FileIndex.java:393)	at net.sourceforge.docfetcher.model.index.file.HtmlFileLister.runWithHtmlPairing(HtmlFileLister.java:145)	at net.sourceforge.docfetcher.model.index.file.HtmlFileLister.doRun(HtmlFileLister.java:57)	at net.sourceforge.docfetcher.util.Stoppable.run(Stoppable.java:57)	at net.sourceforge.docfetcher.model.index.file.FileIndex.visitDirOrZip(FileIndex.java:282)	at net.sourceforge.docfetcher.model.index.file.FileIndex.access$200(FileIndex.java:51)	at net.sourceforge.docfetcher.model.index.file.FileIndex$1.handleDir(FileIndex.java:393)	at net.sourceforge.docfetcher.model.index.file.HtmlFileLister.runWithHtmlPairing(HtmlFileLister.java:145)	at net.sourceforge.docfetcher.model.index.file.HtmlFileLister.doRun(HtmlFileLister.java:57)	at net.sourceforge.docfetcher.util.Stoppable.run(Stoppable.java:57)	at net.sourceforge.docfetcher.model.index.file.FileIndex.visitDirOrZip(FileIndex.java:282)	at net.sourceforge.docfetcher.model.index.file.FileIndex.doUpdate(FileIndex.java:159)	at net.sourceforge.docfetcher.model.TreeIndex.update(TreeIndex.java:148)	at net.sourceforge.docfetcher.model.index.Task.update(Task.java:98)	at net.sourceforge.docfetcher.model.index.IndexingQueue.threadLoop(IndexingQueue.java:193)	at net.sourceforge.docfetcher.model.index.IndexingQueue.access$100(IndexingQueue.java:46)	at net.sourceforge.docfetcher.model.index.IndexingQueue$2.run(IndexingQueue.java:118)