AppletTalk.com

Mehmet Metan · Guest

hello to all.

Exception In thread "SyntheticImageGenerator"
java.lang.OutOfMemoryError: Java heap space

I ve two classes. and I am getting the above error.

Neccessary code is below:

public class MainEngineeringToolFrame extends JFrame implements
ActionListener.
{
//Some Code...
public MainEngineeringToolFrame
{
super("HELP PLS");
System.out.println("**super passed");
setBounds(120,300,1024,428);
setResizable(false);
System.out.println("**next code: Set Visible true");
setVisible(true);
}

//Some Code...

public static void main(String[] args)
{
System.out.println("***Main function loaded.");
MainEngineeringToolFrame frame = new MainEngineeringToolFrame();
System.out.println("***Object created.");
// frame.setTitle
// frame.setResizable
// getContentPane
// add(....
setVisible(true);
}

}

This is my fiirst class.
I created another class for the panel. where painting will occur in it.
necessary code is below:

public class DrawingPanel extends JPanel implements MouseListener,
MouseMotionListener
{
MainEngineeringToolFrame obj = new MainEngineeringToolFrame();

public DrawingPanel()
{
super();
addMouseListener(this);
addMouseMotionListener(this);
setLayout(null);
}

//paint func.
//implemented methods.
}

At the System Line it only prints:

***Main function loaded.

What means it can't create an object from itself in the main class.
than program tries to build itself some time.
And gives an error message like:
I thought increasing the heap space in ecliopse from VM arguments in
run properties window in arguments tag. where under Java Application
(Im thinking u r familliar with eclipse.)

Why does it happpen? I thought this kind of exception may occur in an
infiniteloop where infinite objects are created. Well I dont even have
a loop or Im not creating infinite number of objects..

Any helps appriciated
best regards
metan

Chris Uppal · Guest

Mehmet Metan wrote:

Mehmet Metan · Guest

I ve tried commenting that line but all other obj.smthing related code
is having a null pointer exceptiion. i ve initialized the obj object.
Why i am getting a null pointer exception? Two classes are in the same
package.

regards.

Mehmet Metan · Guest

Ok thats right. I initialize the DrawingPanel in the
MainEngineeringToolFrame like:

private DrawingPanel mDrawingPnl = new DrawingPanel();

other operations for mDrawingPnl in the MainEngineeringToolFrame class
are like below:

public void initComponents() //called in constructor
{
// some code.
mDrawingPnl.setBounds(50,50,200,400);
mDrawingPnl.setVisible(true); // I dont know =]
}

public Component buildPanel() //function is for adding components to
the defined layout with coordinates.
//I ve used JGoodies forms for layout manage. dont need to focus on
that
{
//some code
PanelBuilder panel = new PanelBuilder(layout);
//a lot of builder.add(....
builder.add(mDrawingPnl, cc.xy(5,1)); //coordinates.

return builder.getPanel();
}

main
{
//some code
frame.add(frame.buildPanel());
frame.setVisible(true);
}

And I replaced the DrawingPanel class like this

public class DrawingPanel extends JPanel implements MouseListener,
MouseMotionListener
{
public MainEngineeringToolFrame obj = new
MainEngineeringToolFrame();

but now I m getting a lot of nullPointer exceptions refering to the
variables derived from obj.
Such as in paint function

public void paint(Graphics g)
{
super.paint(g);
g.setColor(obj.getMCurrentColor()); //used the getter method of Color
currentColor variable
}

4 exceptions occured in this line
g.setColor(obj.getMCurrentColor());

saying:
Exception in thread "AWT-EventQueue-0' java.lang.NullPointerException

4 exceptions occured right after each other in one time.

Your helps are appriciated. Thanx again.
and help again pls :)

best regards
metan

Mehmet Metan · Guest

well the problem is because of the MainEngineeringToolFrame obj = new
MainEngineeringToolFrame(); object after debugging. but i am still not
able to understand why..

well in this decleration it is expected that a null pointer exception
will occur

public MainEngineeringToolFrame obj;

but the program window is visible and by buttons and stuff are
available. However any action is taken it is giving a null pointer
exception to the

obj.something

declerations. Ok I understand that. It is normal
but when i initialize the object with its constructor like

public MainEngineeringToolFrame obj = new MainEngineeringToolFrame();

it is giving the

Exception In thread "SyntheticImageGenerator"
java.lang.OutOfMemoryError: Java heap space

error and terminates the program without initialization. What would i
have to do?

In addition I think the declarations and initializations of
DrawingPanel object in the MainEngineeringToolFrame is correct.. if not
may be the problem can be solved there..

necessary code is below:

public class MainEngineeringToolFrame extends JFrame implements
ActionListener.
{
//Some Code...
private DrawingPanel mDrawingPnl = new DrawingPanel();

public MainEngineeringToolFrame()
{
super("HELP PLS");
setBounds(120,300,1024,428);
setResizable(false);
initComponents();
setVisible(true);

}
public void initComponents() //called in constructor
{
// some code.
mDrawingPnl.setBounds(50,50,200,400);
mDrawingPnl.setVisible(true); // I dont know =]

}

//function is for adding components to the defined layout with
coordinates.
//I ve used JGoodies forms for layout manage. dont need to focus on
public Component buildPanel()
{
//some code
PanelBuilder panel = new PanelBuilder(layout);
//a lot of builder.add(....
builder.add(mDrawingPnl, cc.xy(5,1)); //coordinates.

return builder.getPanel();

}
//Some Code...

public static void main(String[] args)
{
System.out.println("***Main function loaded.");
MainEngineeringToolFrame frame = new MainEngineeringToolFrame();
System.out.println("***Object created.");
// frame.setTitle
// frame.setResizable
// getContentPane
// add(....
frame.add(frame.buildPanel());
setVisible(true);
}

}

Second class

public class DrawingPanel extends JPanel implements MouseListener,
MouseMotionListener
{
MainEngineeringToolFrame obj = new MainEngineeringToolFrame();

public DrawingPanel()
{
super();
addMouseListener(this);
addMouseMotionListener(this);
setLayout(null);
}

public void paint(Graphics g)
{
super.paint(g);
g.setColor(obj.getMCurrentColor()); //used the getter method of
Color currentColor variable
//Exception will occur.

}
//implemented methods.

}

Any suggestions are very appriciated.
Thanx
regards.

Rhino · Guest

"Mehmet Metan" <phreaker85 (AT) gmail (DOT) com> wrote in message
news:1142498745.312139.191680 (AT) i39g2000cwa (DOT) googlegroups.com...