NoClassDefFoundError in wait for image

[luislupe]

I'm using:
  sikulixide-2.0.4.jar
  Linux 5.7.10_1 #1 SMP x86_64

At the second line of the script

openApp("firefox https://www.recheio.pt")
wait("1596027541334.png")

There's an error message:
[error] script [ recheio ] stopped with error in line 2
[error] java.lang.NoClassDefFoundError ( java.lang.NoClassDefFoundError: Could not initialize class org.sikuli.script.Finder$FindInput2 )
[error] --- Traceback --- error source first
line: module ( function ) statement
63: Sikuli ( wait ) return SCREEN.wait(target)
2: main ( <module> ) wait("1596027541334.png")
[error] --- Traceback --- end --------------

[RaiMan (raimund-hocke)]

I guess you do not have OpenCV ready:
https://sikulix-2014.readthedocs.io/en/latest/newslinux.html#getting-the-opencv-support-ready

[luislupe (luislupe)]

I haven't built from sources yet.

The OpenCV packages that are installed are the ones with the '[*]':

[*] libopencv-3.4.10_1 Computer vision and machine learning software library - library files
[-] libopencv-devel-3.4.10_1 Computer vision and machine learning software library - development files
[-] libopencv-python-3.4.10_1 Computer vision and machine learning software library - Python2 bindings
[*] libopencv-python3-3.4.10_1 Computer vision and machine learning software library - Python3 bindings
[*] libopencv4-4.3.0_3 Computer vision and machine learning software library, version 4.x - library files
[-] libopencv4-devel-4.3.0_3 Computer vision and machine learning software library, version 4.x - development files
[-] libopencv4-python-4.3.0_3 Computer vision and machine learning software library, version 4.x - Python2 bindings
[-] libopencv4-python3-4.3.0_3 Computer vision and machine learning software library, version 4.x - Python3 bindings
[*] opencv-3.4.10_1 Computer vision and machine learning software library
[*] opencv4-4.3.0_3 Computer vision and machine learning software library, version 4.x

After installing the opencv and opencv4 packages, there's the error:
[error] RunTime:loadLib: opencv_java (failed) probably dependent libs missing:
no opencv_java in java.library.path
[error] Save your work, correct the problem and restart the IDE!
[error] script [ recheio ] stopped with error in line 2
[error] java.lang.ExceptionInInitializerError ( java.lang.ExceptionInInitializerError )
[error] --- Traceback --- error source first
line: module ( function ) statement
63: Sikuli ( wait ) return SCREEN.wait(target)
2: main ( <module> ) wait("1596027541334.png")
[error] --- Traceback --- end --------------

Tried to find the libopencv_java file with
find /usr/ -name libopencv_java*
but got no result.

Do you think this file can be obtained from any of the OpenCV packages that are not yet installed (lib...) or my best bet is to install from sources?

[RaiMan (raimund-hocke)]

You should only have the 3.4 version active (sym-linked) on your system.

Make sure you have a libopencv_java34x.so in your library path.
In doubt create a symlink in /usr/local/lib pointing to the real .so

This is the first level lib that is needed by Sikuli 2.0.4