[Demonstration 1]

[Buggy Method]
@Test
public void testMultiIteration() throws Exception {
    TestSource src1 = new TestSource("a", "b", "c");
    TestSource src2 = new TestSource("d", "e", "f");
    TestSource src3 = new TestSource("g", "h", "i");
    MultiSource<String> multiSource = new MultiSource<>(Lists.<Source<String>>newArrayList(src1, src2, src3));
    Iterable<String> iterable = multiSource.getIterable();
    Iterator<String> iterator = iterable.iterator();
    assertEquals("a", iterator.next());
    assertEquals("b", iterator.next());
    assertEquals("c", iterator.next());
    assertTrue(iterator.hasNext());
    assertTrue(src1.isFinished());
    assertEquals("d", iterator.next());
    assertEquals("e", iterator.next());
    assertEquals("f", iterator.next());
    assertTrue(iterator.hasNext());
    assertTrue(src2.isFinished());
    assertEquals("g", iterator.next());
    assertEquals("h", iterator.next());
    assertEquals("i", iterator.next());
    assertFalse(iterator.hasNext());
    assertTrue(src3.isFinished());
}

[Buggy Hunk]
Lists.<Source<String>>newArrayList(src1, src2, src3));

[Patch]
Lists.<Source<? extends String>>newArrayList(src1, src2, src3));

[Demonstration 2]

[Buggy Method]
public static Result service(String ownerName, String projectName, String service, boolean isAdvertise) throws IOException, UnsupportedOperationException, ServletException {
    if (!isSupportedService(service)) {
        return forbidden(String.format("Unsupported service: '%s'", service));
    }
    Project project = Project.findByOwnerAndProjectName(ownerName, projectName);
    if (project == null) {
        return notFound();
    }
    models.User user = UserApp.currentUser();
    if (!isAllowed(project, service)) {
        if (user.isAnonymous()) {
            return BasicAuthAction.unauthorized(response());
        } else {
            // If you want the Git client showing your custom message to
            // the user, the Content-Type should be exact "text/plain"
            // without any parameter. For more details, see the code at
            // https://github.com/git/git/commit/426e70d4a11ce3b4f70636d57c6a0ab16ae08a00#diff-eea0ad565ec5903a11b6023755d491cfR154
            response().setHeader("Content-Type", "text/plain");
            return forbidden(String.format("'%s' has no permission to '%s/%s'.", user.name, ownerName, projectName));
        }
    }
    if (isAdvertise) {
        return ok(RepositoryService.gitAdvertise(project, service, response()));
    } else {
        if (request().body().isMaxSizeExceeded()) {
            return status(REQUEST_ENTITY_TOO_LARGE);
        } else {
            user.visits(project);
            return ok(RepositoryService.gitRpc(project, service, request(), response()));
        }
    }
}

[Buggy Hunk]
user.name, ownerName, projectName));

[Patch]
user.loginId, ownerName, projectName));