Can't Access Resources In Executable Jar

Question

Can someone please point out what I\'m doing wrong here.

I have a small weather app that generates and sends an HTML email. With my code below, everything works fin

Answer 1

I don't know if this will help anyone or not. But, I have a similar case as the OP and I solved the case by finding the file in the classpath using recursive function. The idea is so that when another developer decided to move the resources into another folder/path. It will still be found as long as the name is still the same.

For example, in my work we usually put our resources outside the jar, and then we add said resources path into our classpath, so here the classpath of the resources will be different depending on where it is located.

That's where my code comes to work, no matter where the file is put, as long as it's in the classpath it will be found.

Here is an example of my code in action:

import java.io.File;

public class FindResourcesRecursive {

    public File findConfigFile(String paths, String configFilename) {
        for (String p : paths.split(File.pathSeparator)) {
            File result = findConfigFile(new File(p), configFilename);
            if (result != null) {
                return result;
            }
        }
        return null;
    }

    private File findConfigFile(File path, String configFilename) {
        if (path.isDirectory()) {
            String[] subPaths = path.list();
            if (subPaths == null) {
                return null;
            }
            for (String sp : subPaths) {
                File subPath = new File(path.getAbsoluteFile() + "/" + sp);
                File result = findConfigFile(subPath, configFilename);
                if (result != null && result.getName().equalsIgnoreCase(configFilename)) {
                    return result;
                }
            }
            return null;
        } else {
            File file = path;
            if (file.getName().equalsIgnoreCase(configFilename)) {
                return file;
            }
            return null;
        }
    }

}

Here I have a test case that is coupled with a file "test.txt" in my test/resources folder. The content of said file is:

A sample file

Now, here is my test case:

import org.junit.Test;

import java.io.*;

import static org.junit.Assert.fail;

public class FindResourcesRecursiveTest {

    @Test
    public void testFindFile() {
        // Here in the test resources I have a file "test.txt"
        // Inside it is a string "A sample file"
        // My Unit Test will use the class FindResourcesRecursive to find the file and print out the results.
        File testFile = new FindResourcesRecursive().findConfigFile(
                System.getProperty("java.class.path"),
                "test.txt"
        );

        try (FileInputStream is = new FileInputStream(testFile)) {
            int i;
            while ((i = is.read()) != -1) {
                System.out.print((char) i);
            }
            System.out.println();
        } catch (IOException e) {
            fail();
        }

    }
}

Now, if you run this test, it will print out "A sample file" and the test will be green.