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This exception has no message.
java.lang.NullPointerException at java.util.ArrayList.addAll(Unknown Source) at com.sun.pdfview.annotation.WidgetAnnotation.getPageCommandsForAnnotation( at com.sun.pdfview.PDFPage.setAnnots( at com.sun.pdfview.PDFFile.createPage( at com.sun.pdfview.PDFFile.getPage( at com.benryan.conversion.PdfSlideConversionBatchTask.convertFile( at com.benryan.conversion.PdfSlideConversionBatchTask.convertFile( at at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$ Source) at Source)