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Tutorial – REST API design and implementation in Java with Jersey and Spring

Looking to REST in Java? Then you’ve come to the right place, because in the blog post I will present you how to “beautifully” design a REST API and also, how to implement it ...
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Why I distrust wildcards and why we need them anyway

In any programming language that combines subtype polymorphism (object orientation) with parametric polymorphism (generics), the question ofvariance arises. Suppose I have a list of ...
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HawtIO on JBoss Wildfly 8.1

HawtIO gives awesome eye candy to your JVM based middleware. It’s a unifying console for applications that would otherwise have to build out their own crappy web console; and let’s ...
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Testing code for excessively large inputs

When writing unit tests we mostly focus on business correctness. We do our best to exercise happy path and all edge cases. We sometimes microbenchmark and measure throughput. But one ...
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How to Load Resources from Classpath in Java with Example

Classpath in Java is not only used to load .class files, but also can be used to load resources e.g. properties file, images, icons, thumbnails, or any binary content. Java provides ...
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Introducing the JBoss BPM Suite installer

This week we want to introduce you to the rather unknown installer component that is delivered with the JBoss BRMS and JBoss BPM Suite products. Note that all the current demo projects ...
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Adding Custom Claims to the SAML Response – (How to Write a Custom Claim Handler for WSO2 Identity Server)

Overview The latest release of WSO2 Identity Server (version 5.0.0), is armed with an “application authentication framework” which provides lot of flexibility in authenticating ...
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The lepidopterist’s curse: Playing with java.time

Pop quiz: What will be the output of this little program?                     public class DateFun { public static void main(String[] ...
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Java private, protected, public and default

You are a Java programmer, so you know what I am talking about. public modifiers make a method or field accessible from anywhere in the application. That is the simple part. But can ...
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Avoiding Null Checks In Java

One of the worst nightmares for java developers ( from junior to experts ) is null object reference checking. I’m pretty sure you have seen several times code like this:                   public ...
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