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Tomcat Clustering Series Part 1 : Simple Load Balancer

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I am going to start new series of posts about Tomcat clustering. In this post we will see what is the problem in normal deployment on a single machine, what is clustering and why is it necessary and how to setup a simple load balancer with Apache httpd web server + Tomcat server cluster. Why need Clustering? (Tomcat Clustering) In normal ...

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Simple Workflow Engine With Spring

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Few months ago, during working on one of the company project, we had need to developed REST services which is used for sending an email depending on data sent by client application. During developing this service we decide to create simple workflow engine which will be charged for sending an email, but also this engine can be used for any ...

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Embedding HSQLDB server instance in Spring

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I was using XAMPP happily for development until I had to host it somewhere accessible via the Internet for the client to test and use. I have a VPS that only has 384 RAM, and needing to find a way fast, I decided to install XAMPP into the VPS. Because of the low RAM, when MySQL was running, Tomcat failed ...

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Benchmarking Scala against Java

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A question recently came up at work about benchmarks between Java and Scala. Maybe you came across my blog post because you too are wanting to know which is faster, Java or Scala. Well I’m sorry to say this, but if that is you, you are asking the wrong question. In this post, I will show you that Scala is ...

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Spring 3.1, Cloud Foundry and Local Development

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This post will help you build a Spring 3.1 web application using MongoDB on Cloud Foundry. In addition to pushing to Cloud Foundry, you will also be able to develop in your local environment with a MongoDB instance. Goals The goals for this blog posting will be to build the application locally, then publish to your local Cloud Foundry instance. ...

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Hadoop + Amazon EC2 – An updated tutorial

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There is an old tutorial placed at Hadoop’s wiki page: http://wiki.apache.org/hadoop/AmazonEC2, but recently I had to follow this tutorial and I noticed that it doesn’t cover some new Amazon functionality. To follow this tutorial is recommended that you are already familiar with the basics of Hadoop, a very useful ‘how to start’ tutorial can be found at Hadoop’s homepage: http://hadoop.apache.org/. ...

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Sandboxing Java Code

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In a previous post, we looked at securing mobile Java code. One of the options for doing so is to run the code in a cage or sandbox. This post explores how to set up such a sandbox for Java applications. Security Manager The security facility in Java that supports sandboxing is the java.lang.SecurityManager. By default, Java runs without a ...

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Why Future Generations Will Hate You for Using java.util.Stack

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Before I kill you with some meaningless tautology, here is the gist If your application is near real time or you are sending your code to Mars, you need to keep off the default Stack implementation in Java. Write your own version based on LinkedList. Again, if your application is mission critical and your Stack is expected to be manipulated ...

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Basics about Servlets

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Through this tutorial i will try to get you closer to the Java Servlet Model. Before we start with examination of classes defined within the servlet specification, i will explain basic stuff needed to know before you start with developing web application. Understanding the Java Servlet Models First of all Java Servlet Model is not defined only for the web ...

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Trunk, Branch, Tag And Related Concepts

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Trunk, Branch and Tag concepts are relevant to revision control (or version control) systems. These systems are typically implemented as repositories containing electronic documents, and changes to these documents. Each set of changes to the documents is marked with a revision (or version) number. These numbers identify each set of modifications uniquely. Reminder A version control system, like Subversion, works with a central repository. Users can check ...

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