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Session Timeout Handling on JSF AJAX request

Session Timeout Handling on JSF AJAX request When we develop JSF application with AJAX behaviour, we may experience the problem in handling timeout scenario of Ajax request. For example, ...
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What is a PermGen leak?

What follows is a practical introduction to a specific type of memory problems in Java applications. Namely – we will analyze the errors that cause the java.lang.OutOfMemoryError: ...
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Google Guava EventBus and Java 7 WatchService for Event Programming

This post is going to cover using the Guava EventBus to publish changes to a directory or sub-directories detected by the Java 7 WatchService. The Guava EventBus is a great way to add ...
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Using Cryptography in Java Applications

This post describes how to use the Java Cryptography Architecture (JCA) that allows you to use cryptographic services in your applications. Java Cryptography Architecture Services The ...
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Google Guava MultiMaps

Guava? This is the first in a series of posts where I’ll be attempting to explain and explore Google’s awesome Guava java library. I first came across Guava whilst searching ...
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How much memory do I need

What is retained heap? How much memory will I need? This is a question you might have asked yourself (or others) when building a solution, creating a data structure or choosing an algorithm. ...
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Calculating A Co-Occurrence Matrix with Hadoop

This post continues with our series of implementing the MapReduce algorithms found in the Data-Intensive Text Processing with MapReduce book. This time we will be creating a word co-occurrence ...
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When using direct memory can be faster

Overview Using direct memory is no guarantee of improving performance.  Given it adds complexity, it should be avoided unless you have a compelling reason to use it. This excellent ...
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Forcing Tomcat to log through SLF4J/Logback

So you have your executable web application in JAR with bundled Tomcat (make sure to read that one first). However there are these annoying Tomcat logs at the beginning, independent ...
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Event streaming with MongoDB

MongoDB is a really great “NoSQL” database, with a very wide range of applications. In one project that we are developing at SoftwareMill, we used it as a replicated event storage, ...
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