Create a Choice component with 20 items. Use Choice.getItem(int) to get each item and store it in a Vector. Then use Choice.removeAll() to remove all items from the Choice. Then re-add the original 20 items from the Vector, and add one more item via Choice.addItem(). The last addItem() causes a core dump.


Below is a java application that reproduces the problem. Click on the add item button and the application will core dump.




import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class testChoice extends java.applet.Applet implements
ActionListener,
ItemListener {
    Frame frame;
    Choice choice;
    Button addItemBtn;


    public static void main(String args[]) {
Frame f = new Frame("Choice test");
testChoice clnt = new testChoice();
clnt.init();
clnt.start();

f.add("Center", clnt);
f.setSize(500, 300);
f.pack();
f.show();
    }

    public void init() {


// text to send and send button
  setLayout(new GridLayout(2,2,1,1));

add(choice = new Choice());

for ( int i = 0; i < 20; i++ )
choice.addItem("test");

add(new Label(""));

choice.addItemListener(this);

add(new Label(""));
addItemBtn = new Button("Add Item");
add(addItemBtn);
addItemBtn.addActionListener(this);
    }
    
    public void actionPerformed(ActionEvent e) {
Object source = e.getSource();

if (source == choice) {
} else if (source == addItemBtn) {
Vector v = new Vector();

int numItems = choice.countItems();

for ( int i = 0; i < numItems; i++ )
v.addElement(choice.getItem(i));

choice.removeAll();

for ( int i = 0; i < numItems; i++ )
{
String s = (String)v.elementAt(i);

choice.addItem(s);
}

choice.addItem("New Item");
}
    }

    public void itemStateChanged(ItemEvent e) {
    }

    private Frame getFrame() {
if (frame == null) {
Container parent = (Container)this;

            while(parent != null && ! (parent instanceof Frame)) {
                parent = (Container)parent.getParent();
}

            frame = (Frame) parent;
}

return (frame);
    }
}