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Java 8: From PermGen to Metaspace

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As you may be aware, the JDK 8 Early Access is now available for download. This allows Java developers to experiment with some of the new language and runtime features of Java 8. One of these features is the complete removal of the Permanent Generation (PermGen) space which has been announced by Oracle since the release of JDK 7. Interned ...

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History of Open Source

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I gave a talk last year at Walmart HQ about Fuse open source integration and messaging, the benefits of using open source and the benefits of contributing to the Apache Software Foundation. You can find a sanitized version on slideshare.net. I also covered the history of open source, and like all histories there is no one ‘right’ story, but I ...

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Unix pipelines for basic spelling error detection

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Introduction We can of course write programs to do most anything we want, but often the Unix command line has everything we need to perform a series of useful operations without writing a line of code. In my Applied NLP class today, I show how one can get a high-confidence dictionary out of a body of raw text with a ...

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Defensive API evolution with Java interfaces

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API evolution is something absolutely non-trivial. Something that only few have to deal with. Most of us work on internal, proprietary APIs every day. Modern IDEs ship with awesome tooling to factor out, rename, pull up, push down, indirect, delegate, infer, generalise our code artefacts. These tools make refactoring our internal APIs a piece of cake. But some of us ...

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High Performance Durable Messaging

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Overview While there are a good number of high performance messaging systems available for Java, most avoid quoting benchmarks which include durable messaging and serialization/deserialization of messages. This is done for a number of reasons; 1) you don’t always need or want durable messages 2) you want the option of using your own serialization. One important reason they are avoided ...

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Building Vaadin UI with Xtend

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Today I have decided to say hello to Xtend . I had wish to learn some new programming language. The list of the criteria for choosing one, wasn’t so big . It must be a programming language running on JVM, and it would be nice if i don’t need to learn completely new eco system for building application. I have ...

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40 Java Collections Interview Questions and Answers

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Java Collections Framework are the fundamental aspect of java programming language. It’s one of the important topic for java interview questions. Here I am listing some important questions and answers for java collections framework. Tip Are you looking for career opportunities in Java?   Visit our Job Board to search and review a hand-picked selection of Java jobs for IT ...

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Amdahl’s law illustrated

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The article will explain the Amdahl’s law in simple terms. We are going to demonstrate via a case study how throughput and latency are changing when you change the number of threads performing the tasks. We also help to draw right conclusions in the context of your own performance tuning task at hand. First of all, let’s refresh our memory ...

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Hello Camel: Automatic File Transfer

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Apache Camel is described on its main web page (and in the Camel User Guide) as ‘a versatile open-source integration framework based on known Enterprise Integration Patterns.’ The Camel framework is based on the book Enterprise Integration Patterns and provides implementations of the patterns described in that book. I look at a ‘Hello World’ type example of using Camel in ...

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