How to parse a specific tab information using XssFReader in EventModel using POI

Question

I am working with a large xlsm file, the file has many tabs and i want to parse a specific tab information.I am able to load the file using apache EventUsrerModel documentaion.But i am not able to get the specific tab information using XSSFReader and also i have used another APIs like XSSFWorkBook with OCPPackage, but it is failing me with heap space.Only XSSFReader is able to load the document into the system but i don't know how to get a specific tab information using it. Here i am giving the code i have upto now,

I am using a java class where i am setting the large file like ,

public class LargeExcelManager {

private OPCPackage pkg ;



public OPCPackage getPkg() {
    return pkg;
}

public void setPkg(OPCPackage pkg) {
    this.pkg = pkg;
}

public LargeExcelManager(String fileName)throws Exception {

    openWorkbook(fileName);
}

private void openWorkbook(String fileName)throws Exception {
    try {
        System.out.println("Can be added now");
        //File myFile = new File(fileName);
        this.setPkg(OPCPackage.open(fileName));
    } catch (Exception e) {
        e.printStackTrace();
    }
     }


  }

And here i am loading the document using XSSFReader,

public void startElement(String uri, String localName, String name,
            Attributes attributes) throws SAXException {
        try {

        // c => cell
        if(name.equals("c")) {
            // Print the cell reference
            System.out.print(attributes.getValue("r") + " - ");
            String  rowIndex = (attributes.getValue("r")); 
            //  I have to ignore some rows here and get the data how can i do that ?
            // Figure out if the value is an index in the SST
            String cellType = attributes.getValue("t");
            if(cellType != null && cellType.equals("s")) {
                nextIsString = true;
            } else {
                nextIsString = false;
            }
        }
        // Clear contents cache
        lastContents = "";
        }catch(Exception e) {
            e.printStackTrace();
        }
    }

Is this is the wright way i am passing the sheet "Loan information" that i am getting to the process ?? If so can anyone tell me how i can get the the desired row information from it ???