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How to build a symbol solver for Java, in Clojure

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

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

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

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

(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

spring-interview-questions-answers

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

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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Released: NetBeans IDE 8.1 Beta

NetBeans IDE 8.1 Beta has been released. NetBeans IDE has a track record, built up over 15 years, of delivering complete and comprehensive tools for Java developers. Over the last few years, NetBeans IDE has been achieving the same for JavaScript developers. In particular, NetBeans IDE 8.1 introduces complete and comprehensive tools for Node.js application development. Together with benefiting from a beefed ...

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Web Services Bottom-up development

The first generation of Web services tools for Java was targeted at exposing existing code as Web services. This approach is called bottom-up because the starting point is code that is being abstracted into an interface definition and subsequently exposed as a Web service implementing that interface. This pattern is familiar to many Web services practitioners and is well-supported by ...

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Blue-green Deployments, A/B Testing, and Canary Releases

A lot of teams I talk to recently are very interested in “DevOps” (whatever that means… seems to mean different things to different people?) and when we sit down and talk about what that really means, the direction of the conversation can go down many interesting paths. And some times, the path it goes down makes people feel very uncomfortable. ...

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