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Web Services Top-down development

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In top-down development, both client-side and server-side developers use WSDL (the top) to produce the artifacts (the bottom) necessary for their respective environments. Top-down development is an increasingly common practice for at least two important reasons. First, in many cases, the WSDL describing a service is available publicly in some registry (like a UDDI). With the tools available today, the ...

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7 ways to improve performance of a Hibernate application

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Hibernate is a great tool for integrating Java web applications with a SQL database, but what should we do when the application’s response times start increasing considerably? What should we do when we’re getting doubts whether the application will scale with the growth of our customer base? Before spending a fortune on hosting or rewriting the code, consider analysing and improving these 7 areas of your web application. #1 Tuning JVM memory settings The JVM ...

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Java Everywhere: Write Once Run Anywhere with DukeScript

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For quite some time already, Java has been failing on its “write once, run anywhere” promise. DukeScript would like to change that by enabling a clean separation of view and logic in cross-platform applications. In this article, a simple scenario is used to introduce the basics of DukeScript. For many years, Java Swing enabled developers to write applications that could ...

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How to build a symbol solver for Java, in Clojure

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Last week we have seen how to build models of Java code from source and JAR files. Now we want to be able to solve symbols: in practice we want to link the symbol references in our source code to symbol declarations either in Java source files or jar files. Symbol references and symbol declarations As first thing we have ...

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WebLogic Server 12.1.3 on Kubernetes

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Most of you recall, that I have some little history in Oracle WebLogic server. Coming all the way back from BEA times. I don’t want to comment on recent developments or features or standard support, but one thing is for sure: It is out there and having the chance to run it containerized is something many customers will appreciate. Maybe ...

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Building models of Java code from source and JAR files

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Recently I spent some time working on effectivejava, which is on its way to reach 300 stars on GitHub (feel free to help reaching the target :D). Effectivejava is a tool to run queries on your Java code. It is based on another project I contribute to, javaparser. Javaparser takes as input Java source code and produce an Abstract Syntax Tree ...

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Global Data Consistency in Distributed (Microservice) Architectures

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I’ve published a generic JCA resource adapter on Github available from Maven (ch.maxant:genericconnector-rar) with an Apache 2.0 licence. This let’s you bind things like REST and SOAP web services into JTA transactions which are under the control of Java EE application servers. That makes it possible to build systems which guarantee data consistency, with as little boiler plate code as ...

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Spark, Parquet and S3 – It’s complicated

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(A version of this post was originally posted in AppsFlyer’s blog. Also special thanks to Morri Feldman and Michael Spector from AppsFlyer data team that did most of the work solving the problems discussed in this article) TL;DR; The combination of Spark, Parquet and S3 (& Mesos) is a powerful, flexible and cost effective analytics platform (and, incidentally, an alternative ...

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Making Spring Batch Groovy

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Here at Keyhole, we are very fond of Spring Batch. In many Java Enterprise environments, there is still a big need for automating moving data around. Spring Batch gives us a great head start on creating these batch processes. Note: if you’re in the area on Wednesday night (8/5/15), check out Keyhole Managing Partner David Pitt’s Spring Batch presentation at the ...

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Events Don’t Eliminate Dependencies

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Event (or message) driven systems (in their two flavors) have some benefits. I’ve already discussed why I think they are overused. But that’s not what I’m going to write about now. I’m going to write (very briefly) about “dependencies” and “coupling”. It may seem that when we eliminate the compile-time dependencies, we eliminate coupling between components. For example: class CustomerActions ...

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