Ij.io().open() raises java.lang.NullPointerException

[biosciflo]

I don't know if this was fix or not but i ran into the same problem for some images like they describe it here (https://forum.image.sc/t/ij-io-open-raises-java-lang-nullpointerexception/72625)

But its a bit more frustrating for me i have two images in the same location imageA.lsm works fine, but imageB.lsm raises the exception (java.lang.NullPointerException: Cannot invoke "org.scijava.io.location.Location.getName()" because "loc" is null), and when i copy it into the fiji folder than it works. But this is only when I test it on a different windows machine, on my own both images work just fine.

The problem is i want to distribute the program as an standalone (via pyinstaller) and that works just fine on my machine but on others i get these inconsistent problems which is very hard to find out and fix.

[kmilo9999]

I can confirm this problem still exists.
ij.io().open(path) does not work with full paths. The workaround was to use relative paths instead."

 relative_path = os.path.relpath(full_path)
 image = self.ij.io().open(relative_path)

[ctrueden]

@kmilo9999 @biosciflo Another workaround:

FileLocation = jimport("org.scijava.io.location.FileLocation")
loc = FileLocation("C:\\path\\to\\image.tif")
dataset = ij.io().open(loc)

[ctrueden]

I looked into this issue a bit... is it possible you are both using absolute paths but with forward slashes?

For example: C:/path/to/image.tif. Rather than backslashes? C:\\path\\to\\image.tif?

I can replicate the problematic null location resolution when I use forward slashes. The reason is that it tries to convert the string to a URI, and C:/path/to/image.tif looks like a valid URI with scheme C. 😅

I pushed a tentative fix: scijava/scijava-common@0d95340.

[kmilo9999]

I looked into this issue a bit... is it possible you are both using absolute paths but with forward slashes?

For example: C:/path/to/image.tif. Rather than backslashes? C:\\path\\to\\image.tif?

I can replicate the problematic null location resolution when I use forward slashes. The reason is that it tries to convert the string to a URI, and C:/path/to/image.tif looks like a valid URI with scheme C. 😅

That might be the reason.
I was using the full path like this:
full path C:/Projects/images/robo5.png

But when I use os.path.relpath(full_path) I get:
relative path ..\images\robo5.png