A mass of outputs to a hidden Java Console will fill the heap until exhaustion resulting in the browser and applet to be unresponsive.

Steps to reproduce :
- Start the Java Control Panel and choose to "Hide" or "Do not start" the Java Console.
- Run the applet provided below in your prefered browser .
- Start jvisualvm to monitor the java-plugin process.

You will see the java heap filling until exhaustion. Some GC tentatives will be useless. The Applet and browser will become unresponsive.

Reproduced with 1.6u18 on Win XP/IE8 with both old and new plugin and Solaris10/Firefox.

% cat TestApplet.java
import javax.swing.*;
import java.awt.*;

public class TestApplet extends java.applet.Applet {

  public void init (){
        JPanel panel = new JPanel();
         Label a = new Label("JConsole Test");
        panel.add(a);
        add(panel);

        Thread testThread = new Thread(){
            public void run()
            {
                int i = 0;
                while( true )
                {
                    System.out.println("************************");
                    for( int j = 0 ; j < 5000 ; j++)
                        System.out.println("Console Test: "+ i + "-" + j);
                    try{
                        sleep(500);
                    }catch ( Exception ex)
                    {
                        ex.printStackTrace();
                    }
                    i++;
                }
            }
        };
        testThread.start();
  }
}
I’m sorry. There is a delay while I am working on some higher priority escalations. I expect to be able to get back to this next week.