在构建java应用程序后,一些GUI组件不能正常工作,但在IDE测试期间一切正常。为什么?

我正在从事GUI java项目,该项目包含FileChooser(与JLabel结合后成为ImageChooser)和JTextArea(在JScrollPane内部)。这两个组件都在JPanel内部。

当我在IntelliJ Idea(2017.2.4版)中运行它时,一切都很好:

UI when executed from IDE

IU when executed from .jar file

我怀疑由于我提供的相对路径,ImageIcon无法初始化:

...
imagePath = "src/main/resources/" + item.getImageName();
//item.getImageName() returns a proper image name, tested with  
//System.out.println() and there is a proper image in that folder.
ImageIcon img = new ImageIcon(imagePath);
img = ImageManager.resize(img);
...
//Resize function in ImageManager class
public static ImageIcon resize(ImageIcon imageIcon, int size){
    return resize(imageIcon, size, size);
}

public static ImageIcon resize(ImageIcon icon){
    return resize(icon, defaultSize);
}

这是路径问题吗?

附笔。