public class Test {

    private int stackLength = 0;

    public void stackOverflow() {
        ++stackLength;
        stackOverflow();
    }

    public static void main(String[] args) throws Throwable {
        Test test = new Test();

        try {
            test.stackOverflow();
        } catch (Throwable e) {
            System.out.println("stack length: " + test.stackLength);
            throw e;
        }
    }
}

stack length: 1052
Exception in thread "main" java.lang.StackOverflowError
    at com.sinosuperman.main.Test.stackOverflow(Test.java:8)
    at com.sinosuperman.main.Test.stackOverflow(Test.java:9)
    at com.sinosuperman.main.Test.stackOverflow(Test.java:9)
    at com.sinosuperman.main.Test.stackOverflow(Test.java:9)
    at com.sinosuperman.main.Test.stackOverflow(Test.java:9)
    ...

package com.sinosuperman.main;

import java.util.ArrayList;
import java.util.List;

public class Test {

    private static class HeapOomObject {
    }

    public static void main(String[] args) {
        List<HeapOomObject> list = new ArrayList<HeapOomObject>();
        while (true) {
           list.add(new HeapOomObject());
        }
    }
}

[GC 17024K->14184K(49088K), 0.1645899 secs]
[GC 26215K->29421K(49088K), 0.0795283 secs]
[GC 35311K(49088K), 0.0095602 secs]
[Full GC 43400K->37709K(49088K), 0.1636702 secs]
[Full GC 49088K->45160K(49088K), 0.1609499 secs]
[GC 45312K(49088K), 0.0265257 secs]
[Full GC 49088K->49087K(49088K), 0.1656715 secs]
[Full GC 49087K->49087K(49088K), 0.1656147 secs]
[Full GC 49087K->49062K(49088K), 0.1976727 secs]
[GC 49063K(49088K), 0.0287960 secs]
[Full GC 49087K->49087K(49088K), 0.1901410 secs]
[Full GC 49087K->49087K(49088K), 0.1673056 secs]
[Full GC 49087K->316K(49088K), 0.0426515 secs]
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at com.sinosuperman.main.Test.main(Test.java:14)

package com.sinosuperman.main;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class Test {
    static class MethodAreaOomObject {
    }
    public static void main(String[] args) {
        while(true){
            Enhancer enhancer = new Enhancer();
            enhancer.setSuperclass(MethodAreaOomObject.class);
            enhancer.setUseCache(false);
            enhancer.setCallback(new MethodInterceptor() {
                public Object intercept(Object obj, Method method, Object[] args,
                        MethodProxy proxy) throws Throwable {
                    return proxy.invoke(obj, args);
                }
            });
            enhancer.create();
        }
    }
}

Exception in thread "main" net.sf.cglib.core.CodeGenerationException:   java.lang.reflect.InvocationTargetException-->null
    at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:237)
    at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
    at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
    at com.sinosuperman.main.Test.main(Test.java:24)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at net.sf.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:384)
    at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:219)
    ... 3 more
Caused by: java.lang.OutOfMemoryError: PermGen space
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
    ... 8 more

package com.sinosuperman.main;

import java.util.ArrayList;
import java.util.List;

public class Test {
    public static void main(String[] args) {
        List<String> list = new ArrayList<String>();
        int i = 0;
        while (true) {
            list.add(String.valueOf(i++).intern());
        }
    }
}

Exception in thread "main" java.lang.OutOfMemoryError: PermGen space
    at java.lang.String.intern(Native Method)
    at com.sinosuperman.main.Test.main(Test.java:12)

MagnifierView.h文件：

#import <Foundation/Foundation.h>

@interface MagnifierView : UIView {
	UIView *viewref;
	CGPoint touchPoint;
	UIImage *cachedImage;
}

@property(nonatomic, retain) UIView *viewref;
@property(assign) CGPoint touchPoint;
@end

MagnifierView.m文件：

#import "MagnifierView.h"

@implementation MagnifierView

@synthesize viewref, touchPoint;

- (id)initWithFrame:(CGRect)frame {
	if (self = [super initWithFrame:frame]) {
		self.backgroundColor = [UIColor clearColor];
	}
	return self;
}

- (void)drawRect:(CGRect)rect {
	if(cachedImage == nil){
		UIGraphicsBeginImageContext(self.bounds.size);
		[self.viewref.layer renderInContext:UIGraphicsGetCurrentContext()];
		cachedImage = [UIGraphicsGetImageFromCurrentImageContext() retain];
		UIGraphicsEndImageContext();
	}
	CGImageRef imageRef = [cachedImage CGImage];
	CGImageRef maskRef = [[UIImage imageNamed:@"loopmask.png"] CGImage];
	CGImageRef overlay = [[UIImage imageNamed:@"loop.png"] CGImage];
	CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef), 
																			CGImageGetHeight(maskRef),
																			CGImageGetBitsPerComponent(maskRef), 
																			CGImageGetBitsPerPixel(maskRef),
																			CGImageGetBytesPerRow(maskRef), 
																			CGImageGetDataProvider(maskRef), 
																			NULL, true);
	CGImageRef subImage = CGImageCreateWithImageInRect(imageRef, CGRectMake(touchPoint.x - 18, touchPoint.y - 18, 36, 36));
	CGImageRef xMaskedImage = CGImageCreateWithMask(subImage, mask);
	CGContextRef context = UIGraphicsGetCurrentContext();
	CGAffineTransform xform = CGAffineTransformMake(1.0, 0.0, 0.0, -1.0, 0.0,  0.0);
	CGContextConcatCTM(context, xform);
	CGRect area = CGRectMake(touchPoint.x - 42, -touchPoint.y, 85, 85);
	CGRect area2 = CGRectMake(touchPoint.x - 40, -touchPoint.y + 2, 80, 80);	
	CGContextDrawImage(context, area2, xMaskedImage);
	CGContextDrawImage(context, area, overlay);
}

- (void)dealloc {
	[cachedImage release];
	[viewref release];
	[super dealloc];
}

@end

TouchReader.h文件：

#import <Foundation/Foundation.h>
#import "MagnifierView.h"

@interface TouchReader : UIView {
	NSTimer *touchTimer;
	MagnifierView *loop;
}

- (void) handleAction:(id)timerObj;
@end

TouchReader.m文件：

#import "TouchReader.h"
#import "MagnifierView.h"

@implementation TouchReader

- (id)initWithFrame:(CGRect)frame {
	if (self = [super initWithFrame:frame]) {
		touchTimer = nil;
		loop = nil;
	}
	return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
	touchTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
																								target:self
																							selector:@selector(handleAction:)
																							userInfo:touches
																							 repeats:NO];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
	if(loop != nil){
		[self handleAction:touches];
		return;
	}
	[touchTimer invalidate];
	touchTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
																								target:self
																							selector:@selector(handleAction:)
																							userInfo:touches
																							 repeats:NO];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
	[touchTimer invalidate];
	touchTimer = nil;
	[loop removeFromSuperview];
	[loop release];
	loop = nil;
}

- (void) handleAction:(id)timerObj {
	NSSet *touches;
	if([timerObj isKindOfClass:[NSSet class]]){
		touches = [timerObj retain];
	}else{
		touches = [[timerObj userInfo] retain];
	}
	if(touchTimer != nil){
		[touchTimer invalidate];
		touchTimer = nil;
	}
	if(loop == nil){
		loop = [[MagnifierView alloc] initWithFrame:self.bounds];
		loop.viewref = self;
		[self addSubview:loop];
	}
	
	UITouch *touch = [touches anyObject];
	loop.touchPoint = [touch locationInView:self];
	[loop setNeedsDisplay];
	[touches release];
}

- (void)dealloc {
	[super dealloc];
}

@end

示例图：