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Google Guava Cache

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This Post is a continuation of my series on Google Guava, this time covering Guava Cache. Guava Cache offers more flexibility and power than either a HashMap or ConcurrentHashMap, but is not as heavy as using EHCache or Memcached (or robust for that matter, as Guava Cache operates solely in memory). The Cache interface has methods you would expect to ...

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Predictability – Making Promises you can Keep

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Speed – being first to market, rapid innovation and conducting fast cheap experiments – is critically important to startups and many high tech firms. This is where Lean Startup ideas and Continuous Deployment come in. And this is why many companies are following Agile development, to design and deliver software quickly and flexibly, incorporating feedback and responding to change. But ...

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JSON-Schema generation in Jersey

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So in my previous post I talked about a proposal to allow the use of JSON-Schema in a WADL, this post looks at how to get this working with a recently build of Jersey. You are going to have to download / reference 1.16SNAPSHOT until 1.16 is released. If you are using Maven this should be quite straight forward to update ...

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Google Guava – Futures

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This post is a continuation of my series on Google Guava, this time covering Futures. The Futures class is a collection of static utility methods for working with the Future/ListenableFuture interface. A Future is a handle to an asynchronous task, either a Runnable or Callable, that was submitted to an ExecutorService. The Future interface provides methods for: getting the results ...

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Java Specification Requests in Numbers

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You all know about the Java Community Process (JCP), don’t you? The JCP is the mechanism for developing standard technical specifications for Java technology. Anyone can register for the site and participate in reviewing and providing feedback for the Java Specification Requests (JSRs), and anyone can sign up to become a JCP Member and then participate on the Expert Group of ...

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Use reCaptcha in a Spring MVC web application

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A CAPTCHA is a program that can generate and grade tests that humans can pass but computer programs ‘cannot‘. One of strategies followed are showing an image to user with distorted text, and user should write text in input area. If showed text is the same as input by user, then we can ‘assure‘ that a human is on computer. A captcha ...

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Tomcat Clustering Series Part 2 : Session Affinity Load Balancer

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This is the second part of the Tomcat Clustering Series. In the first part we discussed how to setup a simple load balancer. And we saw how the load balancer distributes the requests to tomcat instances in a round robin fashion. In this post we talk about what is the problem that occurs in the simple load balancer when we introduce sessions ...

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Polling an http end point using Spring Integration

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It is a little non-intuitive if you want to write a flow with Spring Integration which polls an http end point and gathers some content from the http end point for further processing. Spring Integration provides a couple of ways for integrating with a HTTP endpoint – Http Outbound adapter – to send the messages to an http endpoint Http Outbound ...

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IBM AIX: Java process size monitoring

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This article will provide you with a quick reference guide on how to calculate the Java process size memory footprint for Java VM processes running on IBM AIX 5.3+ OS. This is a complementary post to my original article on this subject: how to monitor the Java native memory on AIX. I highly recommend this read to any individual involved ...

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