[Demonstration 1]

[Buggy Method]
private boolean validateEmail() {
    String text = this.email.getText().toString();
    if (text == null || text.trim().isEmpty() || Utils.validator.validateEmail(text.trim())) {
        this.layoutEmail.setError(getString(R.string.email_error));
        return false;
    } else {
        if (this.name.requestFocus()) {
            getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
        }
        this.layoutName.refreshDrawableState();
        return true;
    }
}

[Buggy Hunk]
if (text == null || text.trim().isEmpty() || Utils.validator.validateEmail(text.trim())) {

[Patch]
if (text == null || text.trim().isEmpty() || !Utils.validator.validateEmail(text.trim())) {

[Demonstration 2]

[Buggy Method]
public static void setText(final int index, final String text) {
    mCocos2dxActivity.runOnUiThread(new Runnable() {

        @Override
        public void run() {
            Cocos2dxEditBox editBox = mEditBoxArray.get(index);
            if (editBox != null) {
                editBox.setChangedTextProgrammatically(true);
                editBox.setText(text);
                int position = text.length();
                editBox.setSelection(position);
            }
        }
    });
}

[Buggy Hunk]
int position = text.length();

[Patch]
int position = editBox.getText().length();

[Demonstration 3]

[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));