Run your Unit Tests in Parallel

It was about time when the developer of Unit Tests had the ability to run the tests in Parallel using annotations. In today's blog post, we will look at how you can make your traditional Junit Tests to run in parallel using annotations provided by Easytest. EasyTest is a Testing Framework build on top of JUnit to provide you ease of writing and maintaining your tests. It is focused on writing Data Driven Tests for your application.


Lets start by assuming a Class ItemService  that has a method 2 methods :
1) getItems that takes 2 arguments Double itemId and String itemType. The API class is described below.
2)    updateItem that takes an Item instance and updates it in the Database.

public class ItemService {

   public List getItems (Double itemId , String itemType);

   public void updateItem (Item item);

}

We will leave out the implementation for the sake of keeping the example simple.

Lets see the step by step approach of writing Parallel Unit Tests.

JavaEE 6 video trainings

http://programming-simplified.com/java_ee_6_video_training.html

Java Concurrent Animated

Java Concurrent Animated

Victor Grazi дуже просто розказав про складний java.util.concurrent. 

Показав як і для чого використовуються  

• Executors
• Future
• synchronized
• ReentrantLock
• Condition
• Semaphore
• ReadWriteLock
• CountDownLatch
• CyclicBarrier
• Phaser
• BlinkingPhaser
• AtomicInteger
• BlockingQueue
• TransferQueue
• CompletionService
• ConcurrentHashMap
• Fork/Join

Для презентації використана програма візуалізації, яку можна завантажити на його сайті - дуже зручно тим хто хоче ознайомитись з можливостями конкурентого API в Java чи має складності з розумінням. 

Release: Appengine 1.8.2

Вийшла нова версія Google App Engine 
З новинок появилась підтримка PHP, а також підтримка Eclipse WTP і модульності, що потенційно спростить розробку аплікацій під екліпсом
Думаю також багатьом буде цікава підтримка git
Більше про новий реліз можна почитати тут
Як зразок аплікації запущеної на апенжіні можна подивитись на систему реєстрації на #JDayLviv

Explanations of common Java exceptions

Статтю можна почитати тут: http://rymden.nu/exceptions.html

Java’s Reflection API

If you have ever asked yourself questions like these:

– “How do I invoke a method, having only its name in a String?”
- “How do I list all the attributes in a class dynamically?”
- “How do I write a method that resets the state of any given object to default values?”

Then you have probably already heared of Java’s Reflection API, and in case you haven’t, this is a good opportunity to see what it’s all about, and what it can be used for. This feature is really powerful, but as always, has to be used with some good judgement.

VisualVM 1.3.6 Released

VisualVM 1.3.6 has been released, delivering many bugfixes and introducing several improvements:

• Unavailable sites aren't deleted on startup
• Metaspace monitoring for JDK 1.8
• Support for read-only JMX connections
• Comparing CPU snapshots
• Retained size by class in HeapWalker
• Built on NetBeans Platform & profiler 7.3.1

See the Release Notes for the list of all changes. The bits can be downloaded at visualvm.java.net.

Comparison of Java Logging Frameworks and Libraries

Please note that the comparison of the different frameworks is a work in progress. If you believe that we missed an important feature or that we got one of the details wrong, please let us know.

	SmartInspect	log4j	Logback	ObjectGuy Framework
License	Commercial	Apache	LGPL	Custom
Source available
Vendor	Gurock	Apache	QOS	-
Website	Link	Link	Link	Link
Basic Features	SmartInspect	log4j	Logback	ObjectGuy Framework
Logging simple text messages
Log levels to filter messages	Debug Verbose Message Warning Error Fatal	Debug Trace Info Warn Error Fatal	Debug Trace Info Warn Error	Debug Info Status Warning Error Critical Fatal
Multiple connections or targets
Log categories or sessions				Limited
Log file rotation by date/time
Log file rotation by size
Log file rotation max parts
Optional configuration files
Advanced Features	SmartInspect	log4j	Logback	ObjectGuy Framework
Logging objects and arrays
Logging complex structures and binary data
Thread-safe logging				?
Tracing method invocation		Text-only	Text-only	Text-only
Logging variable values		Text-only	Text-only	Text-only
Watching variable values
Logging thread and process behavior
Advanced protocols and connections	Network Named Pipe1) Memory Binary Files Custom	Network JMS Database Custom	Network JMS Database Custom	Network Memory Custom
Advanced protocol options	Buffer Reconnect Interval Encryption	Buffer	Buffer Reconnect Interval
Asynchronous logging and backlog queues		Async-only
Log server application
Graphical Viewer	SmartInspect	log4j	Logback	ObjectGuy Framework
Graphical viewer application	1)
Advanced filtering capabilities
Navigation functionality		Limited
Call stacks, graphs and message details
Multiple views or windows		Limited
Live monitoring via network or pipes
Viewing and inspecting application data
Graphical configuration utility
Documentation & Support	SmartInspect	log4j	Logback	ObjectGuy Framework
Getting started tutorials
Online articles / advanced topics
API Reference
Community support
Professional / priority support

1) Only available on the Windows platform

Оригінал:http://www.java-logging.com/comparison/