java.lang.OutOfMemoryError: Java heap space

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java.lang.OutOfMemoryError: Java heap space
at java.util.HashMap.addEntry(HashMap.java:753)
at java.util.HashMap.put(HashMap.java:385)
at org.fontbox.cmap.CMap.addMapping(CMap.java:131)
at org.fontbox.cmap.CMapParser.parse(CMapParser.java:202)
at org.pdfbox.pdmodel.font.PDFont.parseCmap(PDFont.java:509)
at org.pdfbox.pdmodel.font.PDFont.encode(PDFont.java:380)
at org.pdfbox.util.PDFStreamEngine.showString(PDFStreamEngine.java:343)
at org.pdfbox.util.operator.ShowText.process(ShowText.java:64)
at org.pdfbox.util.PDFStreamEngine.processOperator(PDFStreamEngine.java:497)
at org.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:218)
at org.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:177)
at org.pdfbox.util.PDFTextStripper.processPage(PDFTextStripper.java:339)
at org.pdfbox.util.PDFTextStripper.processPages(PDFTextStripper.java:263)
at org.pdfbox.util.PDFTextStripper.writeText(PDFTextStripper.java:219)
at org.pdfbox.util.PDFTextStripper.getText(PDFTextStripper.java:152)
at org.dspace.app.mediafilter.PDFFilter.getDestinationStream(PDFFilter.java:114)
at org.dspace.app.mediafilter.MediaFilterManager.processBitstream(MediaFilterManager.java:602)
at org.dspace.app.mediafilter.MediaFilterManager.filterBitstream(MediaFilterManager.java:513)
at org.dspace.app.mediafilter.MediaFilterManager.filterItem(MediaFilterManager.java:461)
at org.dspace.app.mediafilter.MediaFilterManager.applyFiltersItem(MediaFilterManager.java:428)
at org.dspace.app.mediafilter.MediaFilterManager.applyFiltersCollection(MediaFilterManager.java:417)

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