Thread: Error: Null Exception on Array of classes

Error:

java.lang.NullPointerException
	at AxisManager.CreateAxes(AxisManager.java:15)

Axis Manager:

public class AxisManager {
	//store axises in array
	//store axes order (left to right)
	private Axis[] m_axes;
	private int[] m_axesOrder;
 
	public void CreateAxes(int numAxesIN){
		m_axes = new Axis[numAxesIN];
		m_axesOrder = new int[numAxesIN];
		for(int i = 0; i < m_axes.length; i++){
			System.out.println("i:"+ i); 
			m_axesOrder[i] = i;
			m_axes[i].SetID(i);      //<-Line 15: Error!
		}
	}
}

Axis:

public class Axis {
	private int m_maxScale = 0;
	private int m_minScale = 0;
	private int m_unit = 0; //unit measures on the scale
	private String m_label = "";
	private Colour m_colour = new Colour();
 
	private String m_name ="";
	private int m_id = 0;
 
	private Coordinate[] m_position = new Coordinate[1]; //array 0 = top, 1=bottom
 
	public void SetLabel(String labelIN){
		m_label = labelIN;
	}
 
	public void SetMinAndMax(int minIN,int maxIN){
		m_minScale = minIN;
		m_maxScale = maxIN;	
	}
 
	public String GetLabel(){
		return m_label;
	}
 
	public void SetID(int idIN){
		m_id = idIN;
	}
 
}

XML Reader to grab the data and create the Axis Manager:

 
public class XMLReader {
 
   private PolyManager thePolyManager = new PolyManager();
   private AxisManager theAxisManager = new AxisManager();
 
   public XMLRead(String filenameIN){
      ...
      theAxisManager = new AxisManager();
      theAxisManager.CreateAxes(5);
      ...
   }				
 
}

The main program:

public class TestingProcessing {
 
	private final static String FILE_NAME = "file.xml";
 
 
	private XMLReader objxml = new XMLReader();
 
	private PolyManager m_mainPolyMan;
	private AxisManager m_mainAxesMan;
 
 
	/**
	 * @param args
	 */
	public static void main(String[] args) {
 
 
		TestingProcessing TProc = new TestingProcessing();
 
		TProc.setXMLfile(FILE_NAME);
		TProc.setPolyMan();
		TProc.setAxesMan();
 
	}
 
	public void setPolyMan(){
		m_mainPolyMan = objxml.getPolyMan();
	}
 
	public void setAxesMan(){
		m_mainAxesMan = objxml.getAxisMan();
	}
 
	public void setXMLfile(String fIN){
		  System.out.println("filename: " +  fIN);
		objxml.XMLRead(fIN);
	}
 
	public XMLReader getObjXML(){
		return objxml;
	}
 
}

Why is that erroring?

Any help would be much appreciated.

g000we

Solved it..

public class AxisManager {
	//store axises in array
	//store axises order (left to right)
	private Axis[] m_axes;
	private int[] m_axesOrder;
 
	public void CreateAxes(int numAxesIN){
		m_axes = new Axis[numAxesIN];
		m_axesOrder = new int[numAxesIN];
		for(int i = 0; i < m_axes.length; i++){
			// m_axes[i].SetID(i);
			System.out.println("i:"+ i); 
			m_axes[i] = new Axis();
			m_axesOrder[i] = i;
			m_axes[i].SetID(i);
		}
	}
}