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Guava’s EventBus – Simple Publisher/Subscriber

Looking over recent additions to Google’s Guava Libraries Release 10 I noticed the addition of EventBus. This is a lightweight implementation of a publish-subscribe style messaging system. This is similar to the publish-subs ...
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Setting up Apache Hadoop Multi – Node Cluster

We are sharing our experience about Apache Hadoop Installation in Linux based machines (Multi-node). Here we will also share our experience about different troubleshooting also and make update in future. User creation and other co ...
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Running Map-Reduce Job in Apache Hadoop (Multinode Cluster)

We will describe here the process to run MapReduce Job in Apache Hadoop in multinode cluster. To set up Apache Hadoop in Multinode Cluster, one can read Setting up Apache Hadoop Multi – Node Cluster. For setting up we have to co ...
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Java EE CDI programmatic dependency disambiguation example – Injection Point inspection

In this tutorial we shall see how we can avoid programmatic dependency disambiguation when injecting Java EE CDI beans. We have already shown in the Jave EE dependency disambiguation example how to avoid dependency disambiguation ...
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Reducing memory consumption by 20x

This is going to be another story sharing our recent experience with memory-related problems. The case is extracted from a recent customer support case, where we faced a badly behaving application repeadedly dying with OutOfMemory ...
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5 Reasons to use Guava

Guava is an open source library containing many classes for Java and written by Google. It’s a potentially useful source of miscellaneous utility functions and classes that I’m sure many developers have written themsel ...
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Goodbye Guvnor. Hello Drools Workbench.

Many things are changing for Drools 6.0. Along with the functional and feature changes we have restructured the Guvnor github repository to better reflect our new architecture. Guvnor has historically been the web application for ...
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JPA 2 | EntityManagers, Transactions and everything around it

Introduction One of the most confusing and unclear thing for me, as a Java Developer has been the mystery surrounding the Transaction Management in general and how JPA handles transaction management in particular. When does a tr ...
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Creating Internal DSLs in Java, Java 8- Adopting Martin Fowler’s approach

Currently I am reading this wonderful book on DSLs- Domain Specific Languages by Martin Fowler. The buzz around the DSLs, around the languages which support creation of DSLs with ease, the use of DSLs made me curious to know and l ...
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Invoking Async method call using Future object in Spring

The next example will demonstrate an async method call inside the Spring container. Why do we need async method calls? In some cases we don’t really know if replay is expected or when a result supposed to be delivered back. Trad ...
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