src/main/java/org/apache/sling/servlets/post/impl/operations/CheckinOperation.java [40:52]:
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    @Override
    protected void doRun(SlingHttpServletRequest request, PostResponse response, List<Modification> changes)
            throws PersistenceException {
        try {
            Iterator<Resource> res = getApplyToResources(request);
            if (res == null) {

                Resource resource = request.getResource();
                Node node = resource.adaptTo(Node.class);
                if (node == null) {
                    response.setStatus(HttpServletResponse.SC_NOT_FOUND,
                        "Missing source " + resource + " for checkout");
                    return;
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src/main/java/org/apache/sling/servlets/post/impl/operations/CheckoutOperation.java [39:51]:
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    @Override
    protected void doRun(SlingHttpServletRequest request, PostResponse response, List<Modification> changes)
            throws PersistenceException {
        try {
            Iterator<Resource> res = getApplyToResources(request);
            if (res == null) {

                Resource resource = request.getResource();
                Node node = resource.adaptTo(Node.class);
                if (node == null) {
                    response.setStatus(HttpServletResponse.SC_NOT_FOUND,
                        "Missing source " + resource + " for checkout");
                    return;
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