log of debug stack in helios

[Mandar Khire]

I am using Eclipse helios, i try to keep log of debug when i put break points on each functions,classes etc.
I use notepad & use copy paste method to see how & where & when changes occur when i go to each step. But it very lengthy process...debugging remains i busy in collecting logs.
Is their plug in or very easy method to do this?

[Peter Johnson]

log4j?

[Mandar Khire]

Thanks Peter Johnson for suggesting log4j...
But as i readshort intro.
& as per this.
User(here i) have to read & study for how to collect log...
Now example:-
I write simple code:-

import javax.swing.SwingUtilities;
public class HelloExample {
	Boolean Flag1;	
private void fucntion1() {
	for (int Counter= 0; Counter < 4; Counter++) {
		if( Counter > 0 && Counter < 3) {
			Flag1 =true;
			System.out.println("Flag1 ="+Flag1);
			break;
		}else {
			Flag1 =false;
			System.out.println("Flag1 ="+Flag1);	
		}
		System.out.println("for Flag1 ="+Flag1);
	}
	System.out.println("After for Flag1 ="+Flag1);
}
private void fucntion2() {
	fucntion1();
	System.out.println("After for Flag1 ="+Flag1);
if(Flag1 == true) {
	System.out.println("First time for loop complete & flag true");
}else if(Flag1 == false) {
	System.out.println("First time for loop complete & flag false");
}}
	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				new HelloExample().fucntion2();
			}});}}

In this example i declare 2 variables, 1 boolean, 1 int.
In eclipse helios IDE i can use breakpoints, i put breakpoints on line 4,5,6,7,11,18,21,23,,29 & try to debug i can get stack like this

HelloExample [Java Application]	
	HelloExample at localhost:4634	
		Thread [AWT-Shutdown] (Running)	
		Daemon Thread [AWT-Windows] (Running)	
		Thread [DestroyJavaVM] (Running)	
		Thread [AWT-EventQueue-0] (Suspended (breakpoint at line 29 in HelloExample$1))	
			HelloExample$1.run() line: 29	
			InvocationEvent.dispatch() line: not available	
			EventQueue.dispatchEventImpl(AWTEvent, Object) line: not available	
			EventQueue.access$000(EventQueue, AWTEvent, Object) line: not available	
			EventQueue$1.run() line: not available	
			EventQueue$1.run() line: not available	
			AccessController.doPrivileged(PrivilegedAction<T>, AccessControlContext) line: not available [native method]	
			AccessControlContext$1.doIntersectionPrivilege(PrivilegedAction<T>, AccessControlContext, AccessControlContext) line: not available	
			EventQueue.dispatchEvent(AWTEvent) line: not available	
			EventDispatchThread.pumpOneEventForFilters(int) line: not available	
			EventDispatchThread.pumpEventsForFilter(int, Conditional, EventFilter) line: not available	
			EventDispatchThread.pumpEventsForHierarchy(int, Conditional, Component) line: not available	
			EventDispatchThread.pumpEvents(int, Conditional) line: not available	
			EventDispatchThread.pumpEvents(Conditional) line: not available	
			EventDispatchThread.run() line: not available	
	C:\Program Files\Java\jre6\bin\javaw.exe (May 29, 2012 3:54:27 PM)	

& if i see (x)= variables

this	HelloExample$1  (id=28)	
	'this' referenced from:	
		[0]	InvocationEvent  (id=29)	
			'[0]' referenced from:	
			acc	AccessControlContext  (id=39)	
			bdata	null	
			catchExceptions	false	
			consumed	false	
			exception	null	
			focusManagerIsDispatching	false	
			id	1200	
			isPosted	true	
			isSystemGenerated	false	
			notifier	null	
			runnable	HelloExample$1  (id=28)	
				'runnable' referenced from:	
					[0]	InvocationEvent  (id=29)	
			source	WToolkit  (id=41)	
				'source' referenced from:	
				anchor	Object  (id=50)	
				cacheFontPeer	null	
				calls	 (id=51)	
				clipboard	null	
				deactivationTimes	WeakHashMap<K,V>  (id=52)	
				desktopProperties	HashMap<K,V>  (id=53)	
				desktopPropsSupport	Toolkit$DesktopPropertyChangeSupport  (id=55)	
				dynamicLayoutSetting	true	
				eventDispatched	false	
				eventListener	null	
				listener2SelectiveListener	WeakHashMap<K,V>  (id=57)	
					'listener2SelectiveListener' referenced from:	
					entrySet	null	
					keySet	null	
					loadFactor	0.75	
					modCount	0	
					queue	ReferenceQueue<T>  (id=69)	
					size	0	
					table	WeakHashMap$Entry[16]  (id=71)	
					threshold	16	
					values	null	
				modalityListeners	SunToolkit$ModalityListenerList  (id=58)	
				queueEmpty	false	
				waitLock	"Wait Lock" (id=61)	
					'waitLock' referenced from:	
						[0]	WToolkit  (id=41)	
						[1]	Class<T> (sun.awt.SunToolkit) (id=43)	
					count	9	
					hash	0	
					offset	0	
					value	 (id=73)	
						'value' referenced from:	
							[0]	"Wait Lock" (id=61)	
								'[0]' referenced from:	
									[0]	WToolkit  (id=41)	
										'[0]' referenced from:	
										anchor	Object  (id=50)	
										cacheFontPeer	null	
										calls	 (id=51)	
										clipboard	null	
										deactivationTimes	WeakHashMap<K,V>  (id=52)	
										desktopProperties	HashMap<K,V>  (id=53)	
										desktopPropsSupport	Toolkit$DesktopPropertyChangeSupport  (id=55)	
										dynamicLayoutSetting	true	
										eventDispatched	false	
										eventListener	null	
										listener2SelectiveListener	WeakHashMap<K,V>  (id=57)	
										modalityListeners	SunToolkit$ModalityListenerList  (id=58)	
										queueEmpty	false	
										waitLock	"Wait Lock" (id=61)	
										windowClosingListener	null	
										wprops	null	
									[1]	Class<T> (sun.awt.SunToolkit) (id=43)	
								count	9	
								hash	0	
								offset	0	
								value	 (id=73)	
						[0]	W	
						[1]	a	
						[2]	i	
						[3]	t	
						[4]	
						[5]	L	
						[6]	o	
						[7]	c	
						[8]	k	
				windowClosingListener	null	
				wprops	null	
			throwable	null	
			when	1338287438512	

Now if i click F5 then again something change in Debug view & same with variables also...For auto capturing all this in txt or something like that...
log4j is only one option or just copy-paste in 2 different files is only way?
I am doing this(collecting stack & study it), is really helpful for understand how something happened in VM due to some line of code?
I also download Bytecode Visualizer from Marketplace of eclipse IDE. By that if i open any class, it will show detail code which in that class..but not understand it properly...which language is that?
eg:- i open Recatangle.class
i got few lines like

 public Rectangle() {
        0 aload_0;
        1 iconst_0;
        2 iconst_0;
        3 iconst_0;
        4 iconst_0;
        5 invokespecial 189;      /* java.awt.Rectangle(int arg0, int arg1, int arg2, int arg3) */
        8 return;

How to understand it?

[Peter Johnson]

I'm sorry, but I have no idea what it is that you are attempting to do. It sounds like you are trying to capture the flow of your application, but I'm not sure why. (Back when I first started programming we didn't have IDEs nor debuggers, so we manually executed our source code on paper while keeping track of variable values. That should work for a simple program like the one you have.) Besides, the System.out.printlns should show you the flow.

Regarding Bytecode Visualizer, Java bytecode is what you Java source code get compiled into. The javap tool that comes with the JDK can also print out the bytecode. Unless you are used to looking at assembly code or other machine code, it is not going ot help you all that much.