Error while building ScrollView.

[MehulBhardwaj91]

Environment

• Tesseract Version: Version 4.0
• Commit Number:
• Platform: Ubuntu 16.04.
  After running
  make ScrollView.jar
  I get the following error
  ./com/google/scrollview/ui/SVImageHandler.java:19: error: package javax.xml.bind is not visible import javax.xml.bind.DatatypeConverter; ^ (package javax.xml.bind is declared in module java.xml.bind, which is not in the module graph)
  It seems that in Java 9 this module has been deprecated which is most probably causing this error. I have looked online but can't find a way around this. I am not a Java expert so I don't know what's the possible solution to this.

But this is definitely something that should be looked into and other deprecated packages as well.

[toxic-0518]

I encountered the same problem in Mac OS High Sierra 10.13

[toxic-0518]

It seems that using JDK 8 can solve this problem. @MehulBhardwaj91

[shanalikhan]

Facing same in java 10

[MehulBhardwaj91]

@toxic-0518 : Since this was optional, I went ahead with the training without it. Didn't try it with JDK 8.
@shanalikhan : I would recommend going ahead with training without it.

[shanalikhan]

Thanks, i thought its necessary, i have made it work by install JDK 8 and now training is in process.

[zdenop]

Can somebody familiar with java make it work on various Java version (8-10)?

[amitdo]

I think that scrollview should be disabled by default.

[zdenop]

well it is build just on user request e.g. user want it. But build seems to work only on old java. So we need to modernize it as we did with cpp code.

[amitdo]

it is build just on user request e.g. user want it.

./configure --help

...
--enable-graphics enable graphics (ScrollView) (default)
--disable-graphics disable graphics (ScrollView)
--enable-embedded enable embedded build (default=no)
--disable-openmp do not use OpenMP
--enable-opencl enable opencl build (default=no)
--enable-visibility enable experimental build with fvisibility
(default=no)
--enable-multiple-libraries
enable multiple libraries (default=no)
--disable-tessdata-prefix
don't set TESSDATA-PREFIX during compile
--enable-debug turn on debugging (default=no)

Of course, changing the default will not solve the problem, but I still think we should change it, because scrollview is not necessary for most users.

[amitdo]

[Zdenko, please read my above comment]

https://www.google.com/search?q=package+javax.xml.bind+is+not+visible+import+javax.xml.bind.DatatypeConverter

https://www.logicbig.com/tutorials/core-java-tutorial/modules/root-modules.html

https://stackoverflow.com/questions/43574426/how-to-resolve-java-lang-noclassdeffounderror-javax-xml-bind-jaxbexception-in-j

[zdenop]

@amitdo : above mentioned issue has nothing to do with default building setting --enable-graphics.
I afraid disabling 'graphics' can bring more problems: I have on my TODO list testing one debug variable that start ScrollView, and without it tesseract will not finished. But ScrollView windows is not shown... So we should be careful.

[amitdo]

Okay :-)

[nguyenq]

Attached is the fix, which is to download the required jaxb-api-2.3.1.jar. The files should be placed into java folder, replacing the existing ones. I tested it with Oracle Java 10 on Ubuntu.

java.zip

[zdenop]

Thanks nguyenq!

[amitdo]

Some distros have old java versions.

Will ScrollView still work with or without that jar?

[zdenop]

I tested it with java-1_8_0-openjdk and it worked for me.

[amitdo]

Please update the wiki.
https://github.com/tesseract-ocr/tesseract/wiki/ViewerDebugging

[zdenop]

done