Starting ImageJ from a java program leaves ImagePlus detached.

[odinsbane]

I have some programs that I run, and they start imagej while running. For example.

ImageJ.main(new String[] {});
Path path = Paths.get(IJ.getFilePath("select segmentation to label"));
ImagePlus plus = new ImagePlus(path.toAbsolutePath().toString());
plus.show();

If I run this once, everything works as expected. If I run this again while the first imagej window is still visible, the the second ImagePlus will open without an ImageJ window. I don't mind the lack of a second window, but I cannot access the second ImagePlus, eg save the file, process or adjust contrast.

I think this is a new behavior, but I am not sure. I am using ImageJ 1.51r

[imagejan]

It seems you're using ij.ImageJ (not net.imagej.ImageJ) in your code snippet, so this issue rather belongs to imagej1.

Why do you need to call ImageJ.main at all?

[odinsbane]

True, this should probably be an imagej1 issue.

I don't always like to start my programs from imagej, especially when I am developing them. But I like to have imagej running so I can do things like save and adjust contrast. Which I cannot do with just an ImagePlus window.

[imagejan]

I recommend using a main method in your plugin then, modeled after the one in imagej/example-legacy-plugin:

https://github.com/imagej/example-legacy-plugin/blob/6d0eb4b7e3a289acc580a0da72e21821c624ef14/src/main/java/com/mycompany/imagej/Process_Pixels.java#L163-L187

[odinsbane]

I am using my own main method in the example I pasted. The main difference is the new ImageJ() instead of using ImageJ.main(String[] args). Which works!

Using ImageJ.main will not start a new ImageJ window if one is running already.

Thank you

[ctrueden]

@odinsbane From the exchange above, I take it your issue is solved? Therefore I'm closing this issue. If I am incorrect and there is still a problem, please feel free to reopen with details.