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Busting PermGen Myths

In my latest post I explained the reasons that can cause the java.lang.OutOfMemoryError: PermGen space crashes. Now it is time to talk about possible solutions to the problem. Or, ...
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TaskletStep Oriented Processing in Spring Batch

Many enterprise applications require batch processing to process billions of transactions every day. These big transaction sets have to be processed without performance problems. Spring ...
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ActiveMQ: Understanding Memory Usage

As indicated by some recent mailing list emails and a lot of info returned from Google, ActiveMQ’s SystemUsage and particularly the MemoryUsage functionality has left some people ...
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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: ...
java-interview-questions-answers

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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