Question

I have a scenario where I iterate over a set of rows from a resultset obtained from query

–>QUERY

System.out.println("---Iterating Events---");
while (rs.next()) {

startOfMethod(rs);
}

startOfMethod(ResultSet result)
{
HashMap hmap;
String applicationGroupMap;
String description; 
description = result.getString("description"); //description is an XML string
hmap = new XMLRead().xmlDataOutput(description); //This is a separate class which returns a hashmap
applicationGroupMap = (String) hmap.get("Attribute.applicationGroupMap");
}

The problem is that sometimes when it iterates to the second row from first one and the second row does not have a “Attribute.applicationGroupMap, it retains the older value.

Can anyone tell me how do I refresh the hmap on every iteration?

Code which returns Hmap :-

try {
                Document doc = convertToDocument(xmlStr);

                String hashKey = "";
                String hashValue = "";

                NodeList listOfKeyValues = doc.getElementsByTagName("k");

                for (int s = 0; s < listOfKeyValues.getLength(); s++) {

                        Node firstNode = listOfKeyValues.item(s);

                        if (firstNode.getNodeType() == Node.ELEMENT_NODE) {

                                Element firstElement = (Element) firstNode;

                                NodeList keyList = firstElement.getChildNodes();
                                hashKey = ((Node) keyList.item(0)).getNodeValue().trim();

                                NodeList listOfvalues = doc.getElementsByTagName("v");

                                Node secondNode = listOfvalues.item(s);

                                Element valueElement = (Element) secondNode;

                                NodeList valueList = valueElement.getChildNodes();
                                if (valueList.getLength() != 0) {
                                        hashValue = ((Node) valueList.item(0)).getNodeValue();
                                } else {
                                        hashValue = "";
                                }
                                hsMap.put(hashKey, hashValue);
                        }
                }
        } catch (Throwable t) {

                t.printStackTrace();
        }
        return hsMap;
}

Answer 1

Based on the conversation in the comments, you have two options:

Change the declaration of hsMap in XMLRead to

public HashMap hsMap = new HashMap();

(Not static. It might also be more correct to make it private, but that’s not related to your problem.)

–OR–

In startOfMethod do

hmap.clear();

to clear the map after you’ve gotten what you wanted from it.