I'm using Tess4j in a Java program to access Tesseract and read PDFs read
with PDFBox. I've been using Java 8, and things are running. The program is
not commercial; I provide it to non-profits doing pro bono legal work in my
state. In java 8 using the command line and eclipse, the program runs fine;
running from the command line in either Java 11 or Java 17 causes an error
at the point where the program calls Tesseract.doOCR().
I've dumped class loading information and see that last class loaded before
the fatal exception is com.sun.jna.Platform; it would be used, for
instance, to determine the platform on which the program is running. I
haven't been able to find the source for the 5.2 version I downloaded from
UB Mannheim, that would be useful since the stack trace has line numbers.
The following is a snippet showing log messages, System.out.println
messages, stacktraces, and class loading messages near the point of failure:
pdfRenderer created buffered Image
set a couple of tesseract vars
[14.960s][info][class,load] net.sourceforge.tess4j.util.ImageIOHelper
source: rsrc:tess4j-5.4.0.jar
[14.961s][info][class,load] javax.imageio.IIOParam source: jrt:/java.desktop
[14.961s][info][class,load] javax.imageio.ImageWriteParam source:
jrt:/java.desktop
[14.962s][info][class,load]
com.github.jaiimageio.plugins.tiff.TIFFImageWriteParam source:
rsrc:jai-imageio-core-1.4.0.jar
[14.963s][info][class,load] javax.imageio.IIOImage source: jrt:/java.desktop
[14.964s][info][class,load] com.sun.jna.Library source: rsrc:jna-5.12.1.jar
[14.965s][info][class,load] net.sourceforge.tess4j.ITessAPI source:
rsrc:tess4j-5.4.0.jar
[14.965s][info][class,load] net.sourceforge.tess4j.TessAPI source:
rsrc:tess4j-5.4.0.jar
[14.966s][info][class,load] net.sourceforge.tess4j.util.LoadLibs source:
rsrc:tess4j-5.4.0.jar
[14.969s][info][class,load] com.sun.jna.Platform source: rsrc:jna-5.12.1.jar
[14.973s][info][class,load] java.lang.ExceptionInInitializerError source:
jrt:/java.base
throwable while reading PDF
[14.973s][info][class,load] java.lang.Throwable$PrintStreamOrWriter source:
jrt:/java.base
[14.974s][info][class,load] java.lang.Throwable$WrappedPrintStream source:
jrt:/java.base
java.lang.ExceptionInInitializerError
at net.sourceforge.tess4j.Tesseract.init(Tesseract.java:442)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:326)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:309)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:290)
at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:274)
at
drivingrecordtool.file.DrivingRecordPDFTextReader.getOCRText(DrivingRecordPDFTextReader.java:152)
at
drivingrecordtool.file.DrivingRecordPDFTextReader.getText(DrivingRecordPDFTextReader.java:46)
at
drivingrecordtool.file.DrivingRecordFileReader.doInBackground(DrivingRecordFileReader.java:78)
at
drivingrecordtool.file.DrivingRecordFileReader.doInBackground(DrivingRecordFileReader.java:1)
at java.desktop/javax.swing.SwingWorker$1.call(SwingWorker.java:304)
at
java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.desktop/javax.swing.SwingWorker.run(SwingWorker.java:343)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalStateException: zip file closed
at java.base/java.util.zip.ZipFile.ensureOpen(ZipFile.java:913)
at java.base/java.util.zip.ZipFile.getEntry(ZipFile.java:348)
If I uninstall Java and install Java 8, the program works fine.
If I uninstall Java and install Java 11 or Java 17, it fails in this
fashion.
Can anyone help me understand what the difference might be between the
versions of Java so I can fix this?
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