PDFClown NullPointerException in GlyphMapping

Question

I recently switched my code from PDFClown v0.1.2 to v0.1.2.1. There were some differences which I think I have already met now (changed constructors of TextMarkup() and switching from CallOutNote to StaticNote) but unfortunately I've run in some troubles which I haven't figured out yet how to fix it.

Here is the stacktrace:

Exception in thread "Thread-0" java.lang.ExceptionInInitializerError
at org.pdfclown.documents.contents.fonts.Encoding.put(Encoding.java:88)
at org.pdfclown.documents.contents.fonts.StandardEncoding.<init>(StandardEncoding.java:41)
at org.pdfclown.documents.contents.fonts.Encoding.<clinit>(Encoding.java:54)
at org.pdfclown.documents.contents.fonts.SimpleFont.getBaseEncoding(SimpleFont.java:82)
at org.pdfclown.documents.contents.fonts.SimpleFont.loadEncoding(SimpleFont.java:142)
at org.pdfclown.documents.contents.fonts.SimpleFont.onLoad(SimpleFont.java:170)
at org.pdfclown.documents.contents.fonts.Font.load(Font.java:878)
at org.pdfclown.documents.contents.fonts.Font.<init>(Font.java:368)
at org.pdfclown.documents.contents.fonts.SimpleFont.<init>(SimpleFont.java:65)
at org.pdfclown.documents.contents.fonts.TrueTypeFont.<init>(TrueTypeFont.java:47)
at org.pdfclown.documents.contents.fonts.Font.wrap(Font.java:262)
at org.pdfclown.documents.contents.FontResources.wrap(FontResources.java:72)
at org.pdfclown.documents.contents.FontResources.wrap(FontResources.java:1)
at org.pdfclown.documents.contents.ResourceItems.get(ResourceItems.java:119)
at org.pdfclown.documents.contents.objects.SetFont.getResource(SetFont.java:119)
at org.pdfclown.documents.contents.objects.SetFont.getFont(SetFont.java:83)
at org.pdfclown.documents.contents.objects.SetFont.scan(SetFont.java:97)
at org.pdfclown.documents.contents.ContentScanner.moveNext(ContentScanner.java:1360)
at org.pdfclown.documents.contents.ContentScanner$TextWrapper.extract(ContentScanner.java:819)
at org.pdfclown.documents.contents.ContentScanner$TextWrapper.<init>(ContentScanner.java:771)
at org.pdfclown.documents.contents.ContentScanner$TextWrapper.<init>(ContentScanner.java:764)
at org.pdfclown.documents.contents.ContentScanner$GraphicsObjectWrapper.get(ContentScanner.java:684)
at org.pdfclown.documents.contents.ContentScanner$GraphicsObjectWrapper.access$0(ContentScanner.java:676)
at org.pdfclown.documents.contents.ContentScanner.getCurrentWrapper(ContentScanner.java:1184)
at org.pdfclown.tools.TextExtractor.extract(TextExtractor.java:636)
at org.pdfclown.tools.TextExtractor.extract(TextExtractor.java:653)
at org.pdfclown.tools.TextExtractor.extract(TextExtractor.java:653)
at org.pdfclown.tools.TextExtractor.extract(TextExtractor.java:299)
at theproject.logic.WorkerThread.extractTextOfHighlight(WorkerThread.java:758)
at theproject.logic.WorkerThread.run(WorkerThread.java:107)
Caused by: java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:72)
at org.pdfclown.documents.contents.fonts.GlyphMapping.load(GlyphMapping.java:69)
at org.pdfclown.documents.contents.fonts.GlyphMapping.<clinit>(GlyphMapping.java:47)
... 30 more

The method "extractTextOfHighlight()" extracts the text within a document which is highlighted:

protected List<ITextString> extractTextOfHighlight(Rectangle2D rect2d, Page page) {
    TextExtractor extractor = new TextExtractor();

    List<Rectangle2D> areas = new ArrayList<Rectangle2D>();
    areas.add(rect2d);
    extractor.setAreas(areas);
    extractor.setAreaTolerance(2.0);

    Map<Rectangle2D, List<ITextString>> map = extractor.extract(page);
    // Util.printExtractedTextMapToConsole(map);
    for(Rectangle2D keyRect : map.keySet()) {
        return validateExtractedStrings(map.get(keyRect));
    }

    return null;
}

There is a post on StackExchange which was the only one describing a similar error:

https://stackoverflow.com/a/23804322

I already applied the recommended fix in PDFClown but ran into the same error. My question is, if there is anything I can do to fix this error. I'm really out of ideas.

Here is the pdf I used for my testing: https://www.dropbox.com/s/pt32s7gbrvr21a8/testfile.pdf?dl=0

score 0 · Accepted Answer · answered Aug 17 '16 at 14:43

0

Please verify you have built your PDF Clown jar correctly.

Your exception initially occurs as a NullPointerException

at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:72)
at org.pdfclown.documents.contents.fonts.GlyphMapping.load(GlyphMapping.java:69)
at org.pdfclown.documents.contents.fonts.GlyphMapping.<clinit>(GlyphMapping.java:47)

i.e. in GlyphMapping.load during

  glyphListStream = new BufferedReader(
    new InputStreamReader(
      GlyphMapping.class.getResourceAsStream("/fonts/AGL20.scsv")
      )
    );

the resource "/fonts/AGL20.scsv" could not be found (which causes getResourceAsStream to return null which the InputStreamReader constructor forwards to its parent class Reader constructor which compares its parameter with null and in case of equality throws an explicit NullPointerException).

answered Aug 17 '16 at 14:43

mkl

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Good point! Following your advice I tried to build it again using the ant file, resulting in the following error: Buildfile: /home/workspace/pdfclown.lib/build.xml compile: [javac] /home/workspace/pdfclown.lib/build.xml:68: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds package: [mkdir] Created dir: /home/workspace/pdfclown.lib/build/package BUILD FAILED /home/workspace/pdfclown.lib/build.xml:111: /home/main/res/pkg does not exist. What am I missing? – grml Aug 17 '16 at 20:18
In addition: after failing with the build I added the source code as library in my main project, resulting in the first mentioned error. Just to get it right: 1) download sources from SVN 2) right click on build.xml (Eclipse) > "Run As" > "Ant build" > Run should result in a file "build/package/pdfclown.jar", is this correct? Thank you for your kind help, @mkl! – grml Aug 17 '16 at 20:25
I pulled the sources from SVN again, this time from my own home dir. Now the build worked like a charm and the error is gone now. I'm a little bit embarrassed but happy, that it works now. Keep up the excellent work, @mkl thank you very much! – grml Aug 17 '16 at 20:55

PDFClown NullPointerException in GlyphMapping

1 Answers1