Why does the getResource() method return null in JDK 11?

Question

Simple Java program:

public static String loadText(String file) {
    StringBuilder finalString = new StringBuilder();

    InputStream in = null;
    BufferedReader reader = null;
    InputStreamReader isr = null;

    try{
        System.out.println("Text File: " + file);

        // Version 1
        //URL url = Thread.currentThread().getClass().getResource(file); 
        //in = url.openStream();

        // Version 2
        in = Class.class.getResourceAsStream(file);

        isr = new InputStreamReader(in);
        reader = new BufferedReader(isr);
        String line;
        while((line = reader.readLine()) != null) {
            finalString.append(line).append("//\n");
        }
    }
    catch(IOException e) {
        e.printStackTrace();
        System.exit(-1);
    }
    finally {
        try {
            if (isr != null) { isr.close(); }
            if (reader != null) { reader.close(); }
            if (in != null) { in.close(); }
            } catch (IOException e) { e.printStackTrace(); }
        }
    return finalString.toString();
}

The getResource and getResourceAsStream methods works fine in JDK 8 (java-8-openjdk-amd64) but they always return null in JDK 11.

Questions: Why? And how can I fix this?

• Operation System: Linux Mint 19 Tara x64
• IDE: Eclipse 2018-12 (4.10.0)

Answer 1

There is another solution using ClassLoader

ClassLoader.getSystemResourceAsStream(file)

loads from all locations. I'm using it to load resources from JAR file which holds just resources and no executable code so the previous trick can't work because there is no SomeClass in the JAR to do SomeClass.class.getResourceAsStream()

I just don't understand the internals and I must change also the path of the file.

I have JAR file with file "my-file.txt" in the root of the JAR archive.

For java 8, this worked

Class.class.getResourceAsStream("/my-file.txt");

For java 11, I must remove the leading / even when the file is in the root path

ClassLoader.getSystemResourceAsStream("my-file.txt");