Question

I like to keep my application data and and code in different Source Packages in NB (don’t mistake with java packages).

So I did this time. Unfortunately it can’t get files via File object from one package to another. Here’s my package structure

Source Packages
    |-[J]basicstuff
    |-[J]net.abc.utils
  assets
    |-[F]Images
    |-[F]Layouts

Legend:

• No indication – source packages added in NB’s project properties
• [J] Standard java package
• [F] – folder for data made with file manager

The thing is, I have my custom layout loader as I use my own GUI system. Layouts are JSON text files placed in assets/Layouts. Unfortunately my layoutmanager (which is another class in net.abc.utils) can’t load them. Whatever I do, I can’t load those.

I’ve tried

File layout = new File("assets/Layouts/layout.txt");

then

File layout = new File("../../../assets/Layouts/layout.txt");

Then I remembered it is four directories above, including src dir.

File layout = new File("../../../../assets/Layouts/layout.txt");

But it didn’t work either.

Even tried

File layout = new File("../../../../Layouts/layout.txt");

and

File layout = new File("../../../Layouts/layout.txt");

But those of course also didn’t work. Can you help me?

Answer 1

Dependent on the environment in which your application is (Standalone, ApplicationServer), you will need to use the appropriate ClassLoader.

Try something like this:

private static InputStream getResourceAsStream(String resource) throws FileNotFoundException {
    String stripped = resource.startsWith("/") ? resource.substring(1) : resource;
    InputStream stream = null;
    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
    if (classLoader != null) {
        stream = classLoader.getResourceAsStream(stripped);
    }
    if (stream == null) {
        stream = MyClass.class.getResourceAsStream(resource);
    }
    if (stream == null) {
        stream = MyClass.class.getClassLoader().getResourceAsStream(stripped);
    }
    if (stream == null) {
        throw new FileNotFoundException("Resource not found: " + resource);
    }
    return stream;
}

For use:

MyClass.getResourceAsStream("Layouts/layout.txt");