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Name of the class

In Java every class has a name. Classes are in packages and this lets us programmers work together avoiding name collision. I can name my class A and you can also name your class A ...
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Typical Mistakes in Java Code

This page contains most typical mistakes I see in the Java code of people working with me. Static analysis (we’re using qulice can’t catch all of the mistakes for obvious ...
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Memory leaks – measuring frequency and severity

This post is part of our open culture – we continue sharing insights from our day-to-day work. This time we take a peek at the very core of our value proposition, namely – looking ...
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Garbage Collectors – Serial vs. Parallel vs. CMS vs. G1 (and what’s new in Java 8)

The 4 Java Garbage Collectors – How the Wrong Choice Dramatically Impacts Performance The year is 2014 and there are two things that still remain a mystery to most developers – ...
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Creating an object stream from a JDBC ResultSet

The introduction of  features Stream API and Lambda in Java 8 enables us to make an elegant conversion from a JDBC ResultSet to a stream of objects just providing a mapping function. ...
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Objects Should Be Immutable

In object-oriented programming, an object is immutable if its state can’t be modified after it is created. In Java, a good example of an immutable object is String. Once created, ...
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JUnit in a Nutshell: Test Runners

The fourth chapter of my multi-part tutorial about JUnit testing essentials explains the purpose of the tool’s exchangable test runners architecture and introduces some of the available ...
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Java Concurrency Tutorial – Locking: Intrinsic locks

In previous posts we reviewed some of the main risks of sharing data between different threads (like atomicity and visibility) and how to design classes in order to be shared safely ...
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jUnit: Rules

Rules add special handling around tests, test cases or test suites. They can do additional validations common for all tests in the class, concurrently run multiple test instances, set ...
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Why you should control Visibility of Class and Interface in Java

One of the important aspects of software development is maintenance, and  it’s proven by experience that a piece of software which keeps visibility of its components low is more ...
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