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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)