#fixed code
                             public ItemCollection load(String id) {
		long lLoadTime = System.currentTimeMillis();
		Document persistedDocument = null;

		if (id == null || id.isEmpty()) {
			return null;
		}
		persistedDocument = manager.find(Document.class, id);

		// create instance of ItemCollection
		if (persistedDocument != null && isCallerReader(persistedDocument)) {

			ItemCollection result = null;// new ItemCollection();
			if (persistedDocument.isPending()) {
				// we clone but do not detach
				logger.finest("......clone manged entity '" + id + "' pending status=" + persistedDocument.isPending());
				result = new ItemCollection(persistedDocument.getData());
			} else {
				// the document is not managed, so we detach it
				result = new ItemCollection();
				result.setAllItems(persistedDocument.getData());
				manager.detach(persistedDocument);
			}

			// if disable Optimistic Locking is TRUE we do not add the version
			// number
			if (disableOptimisticLocking) {
				result.removeItem("$Version");
			} else {
				result.replaceItemValue("$Version", persistedDocument.getVersion());
			}

			// update the $isauthor flag
			result.replaceItemValue("$isauthor", isCallerAuthor(persistedDocument));

			// fire event
			if (documentEvents != null) {
				documentEvents.fire(new DocumentEvent(result, DocumentEvent.ON_DOCUMENT_LOAD));
			} else {
				logger.warning("Missing CDI support for Event<DocumentEvent> !");
			}
			logger.fine(
					"...'" + result.getUniqueID() + "' loaded in " + (System.currentTimeMillis() - lLoadTime) + "ms");
			return result;
		} else
			return null;
	}
#vulnerable code 
                             public ItemCollection load(String id) {
		long lLoadTime = System.currentTimeMillis();
		Document persistedDocument = null;
		
		if (id==null || id.isEmpty()) {
			return null;
		}
		persistedDocument = manager.find(Document.class, id);

		// create instance of ItemCollection
		if (persistedDocument != null && isCallerReader(persistedDocument)) {

			ItemCollection result = null;// new ItemCollection();
			if (persistedDocument.isPending()) {
				// we clone but do not detach
				logger.finest("......clone manged entity '" + id + "' pending status=" + persistedDocument.isPending());
				result = new ItemCollection(persistedDocument.getData());
			} else {
				// the document is not managed, so we detach it
				result = new ItemCollection();
				result.setAllItems(persistedDocument.getData());
				manager.detach(persistedDocument);
			}

			// if disable Optimistic Locking is TRUE we do not add the version
			// number
			if (disableOptimisticLocking) {
				result.removeItem("$Version");
			} else {
				result.replaceItemValue("$Version", persistedDocument.getVersion());
			}

			// update the $isauthor flag
			result.replaceItemValue("$isauthor", isCallerAuthor(persistedDocument));

			// fire event
			if (events != null) {
				events.fire(new DocumentEvent(result, DocumentEvent.ON_DOCUMENT_LOAD));
			} else {
				logger.warning("Missing CDI support for Event<DocumentEvent> !");
			}
			logger.fine(
					"...'" + result.getUniqueID() + "' loaded in " + (System.currentTimeMillis() - lLoadTime) + "ms");
			return result;
		} else
			return null;
	} 
                            #location 43 
                            #vulnerability type NULL_DEREFERENCE