reproducer.java

  @Test
  public void testResolveAbsoluteFile() throws Exception {
    File folder = File.createTempFile("test", ".txt");
    assertTrue(folder.delete());
    assertTrue(folder.mkdirs());
    folder.deleteOnExit(); // Cleanup
    File f = new File(folder, "child.txt");
    Files.write(f.toPath(), "the_child".getBytes());
    File notFound = new File(folder, "not_found");
    Thread thread = Thread.currentThread();
    ClassLoader prev = thread.getContextClassLoader();
    ClassLoader next = new URLClassLoader(new URL[0], prev) {
      @Override
      public URL getResource(String name) {
        File f = new File(name);
        if (f.exists()) {
          try {
            return f.toURI().toURL();
          } catch (MalformedURLException e) {
            fail(e);
          }
        }
        return super.getResource(name);
      }
    };
    thread.setContextClassLoader(next);
    try {
      File file = resolver.resolveFile(notFound.getAbsolutePath());
      assertFalse(file.exists());
    } finally {
      thread.setContextClassLoader(prev);
    }
  }