#fixed code
                             public void pasteContainer(int sourceId, int sourceDb, String sourceContainer, int targetId, int targetDb, String targetContainer, boolean copy, boolean overwritten) {
		Set<Node> nodes = listContainerAllKeys(sourceId, sourceDb, sourceContainer);
		
		for(Node node: nodes) {
			pasteKey(sourceId, sourceDb, node.getKey(), targetId, targetDb, targetContainer, copy, overwritten);
		}
	}
#vulnerable code 
                             public void pasteContainer(int sourceId, int sourceDb, String sourceContainer, int targetId, int targetDb, String targetContainer, boolean copy, boolean overwritten) {
		ListContainerAllKeys command = new ListContainerAllKeysFactory(sourceId, sourceDb, sourceContainer).getListContainerAllKeys();
		command.execute();
		Set<Node> nodes = command.getKeys();
		
		for(Node node: nodes) {
			pasteKey(sourceId, sourceDb, node.getKey(), targetId, targetDb, targetContainer, copy, overwritten);
		}
	} 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE