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Analysing the performance degradation/improvements of a Java EE application with interceptors

When you are developing a Java EE application with certain performance requirements, you have to verify that these requirements are fulfilled before each release. An Hudson job that ...
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Named parameters in Java

Creating a method that has many parameters is a major sin. Whenever there is need to create such a method, sniff in the air: it is code smell. Harden your unit tests and then refactor. ...
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Java Numeric Formatting

I can think of numerous times when I have seen others write unnecessary Java code and I have written unnecessary Java code because of lack of awareness of a JDK class that already provides ...
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Java Concurrency Tutorial – Thread-safe designs

After reviewing what the main risks are when dealing with concurrent programs (like atomicity or visibility), we will go through some class designs that will help us prevent the aforementioned ...
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Monitoring and Filtering Application Log to Mail with log4j

In today’s post I’m going to show you how to filter log statements into a warning email. This came out of a necessity to monitor a few critical points of one application I was working ...
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Parameterized Test Runner in JUnit

We all have written unit tests where in a single test tests for different possible input-output combinations. Lets look how its done by taking a simple fibonacci series example. The ...
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The anatomy of Hibernate dirty checking

Introduction The persistence context enqueues entity state transitions that get translated to database statements upon flushing. For managed entities, Hibernate can auto-detect incoming ...
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Debugging OpenJDK

Sometimes debugging Java code is not enough and we need to step over the native part of Java. I spent some time to achieve proper state of my JDK to do that, so short description probably ...
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JPA Tutorial – Setting Up JPA in a Java SE Environment

JPA stands for Java Persistence API, which basically is a specification that describes a way to persist data into a persistent storage, usually a database. We can think of it as ...
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Programming a simple slot machine game using Java

No mat­ter how sim­ple or com­plex the game is, Java can do the job! On this post, let’s take a look at how begin­ners of Java pro­gram­ming can make a sim­ple, yet fully ...
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