I'm getting Exception in thread "Thread-0" java.lang.NullPointerException.
this array is already printed before, I don't understand why int the second time it's throws this error. here is my code:
static Sensors[][] proximity_Sensors;
public static void main(String[] args)
{
StartGUI Quad_StartWindow=new StartGUI();
Quad_StartWindow.StartSimulation.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Thread thread1=new Thread(new Runnable() {
public void run() {
if (ConnectToSimulator(1,Quad_StartWindow)!=-1)
{
ConnecSucc(1);
getSensors(1);
while (System.currentTimeMillis()-startTime < 1000000){
ReadSensor(1); // here the error
}
}
}
});
Thread thread2=new Thread(new Runnable() {
public void run() {
if (ConnectToSimulator(2,Quad_StartWindow)!=-1)
{
ConnecSucc(2);
getSensors(2);
while (System.currentTimeMillis()-startTime < 1000000){
ReadSensor(2);
}
}
}
});
thread1.start();
thread2.start();
}
});
Quad_StartWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Quad_StartWindow.setSize(500, 250);
Quad_StartWindow.setTitle("Drone window");
Quad_StartWindow.setVisible(true);
}
public synchronized static void getSensors(int j)
{
proximity_Sensors=new Sensors[2][8];
for(int i=0;i<8;i++)
{
proximity_Sensors[j-1][i]=new Sensors();
String nameObject="Proximity_sensor"+j+"_"+i;
vrep.simxGetObjectHandle(clientID, nameObject, proximity_Sensors[j-1][i].intObjHandle, vrep.simx_opmode_oneshot_wait);
System.out.println(proximity_Sensors[j-1][i].intObjHandle.getValue() + " " + j+" "+nameObject+" "+i);
}
}
public synchronized static void ReadSensor(int j){
for(int i=0;i<8;i++)
{
ret=vrep.simxReadProximitySensor(clientID, proximity_Sensors[j-1][i].intObjHandle.getValue(), proximity_Sensors[j-1][i].mLightSensorDetectionState, proximity_Sensors[j-1][i].detectedArray, proximity_Sensors[j-1][i].ObjectDetected, proximity_Sensors[j-1][i].detectedSurfArray, vrep.simx_opmode_oneshot_wait);
}
}
and another question, why thread 1 gets the data that thread 2 should get?
