NetworkTables Null Pointer Exception

[sarangmittal]

Hey guys,

We are trying to use RoboRealm to do our vision tracking, and we are able to write the values from RoboRealm onto the NetworkTables (we can see the value changing in TableViewer). However, when we try to run code that gets the value from the NetworkTable and use it in the code, we get a Nullpointer.

package edu.wpi.first.wpilibj.templates;

import edu.wpi.first.wpilibj.networktables.NetworkTable;
import edu.wpi.first.wpilibj.networktables2.type.NumberArray;
import edu.wpi.first.wpilibj.tables.TableKeyNotDefinedException;

public class Vision {
    NetworkTable table;
    double COG_X;

public Vision(){
        NetworkTable table = NetworkTable.getTable("TitanTable");
    }
public double test(){
        try {
            COG_X = table.getNumber("COG_X");
            return COG_X;
        } catch (TableKeyNotDefinedException exp){
            System.out.println("Exception caught");
            return 0;
        }

    }
}

The null pointer pops up from the table.getNumber("COG_X") function. We are thinking its an issue of the code not finding anything named COG_X, but we don't know what to put instead.

Also, when I tried to look in the API for Network Tables, (in the 2013.0.589 update), it was missing. One other member of the team hadn't updated from 2013.0.427 yet, and the API had documentation for NetworkTables. Anyone know what's going on there?

Thanks for the help!