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It seems that splash image file is set as absolute path when it's specified on project properties dialog. e.g. application.splash=C:\\Users\\torutk\\Documents\\myproj\\bluesea.jpg in nbproject\project.properties. It would be trouble when the build environment is changed to another. It's better to set it as relative path from project directory. Usually these image files are stored in project directory. Workaround: It seems that we can specify the path from project directory now. When I tried like "src/abc.png", it can be copied properly to jar file from <projectdir>/src/abc.png.
The path should use CollocationQuery, I will verify.