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Testing Asynchronous Code

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Asynchronous code is hard. Everyone knows that. Writing asynchronous tests is even harder. Recently I fixed a flaky test and I want to share some thoughts about writing asynchronous tests. In this post we explore a common problem with asynchronous tests—how to force a test to take a specific ordering between threads, and forcing some operations by some threads to ...

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Integration testing with Gradle

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Unit testing works automatically using Gradle, but if you would like to have a separate set of integration tests you need to do a small exercise. Actually they don’t have to be integration tests at all. This guide shows you how to configure Gradle to use any kind of tests and run them independently from others. I will use Scala ...

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Rapid Development with Hibernate in CQRS Read Models

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In this post I’m going to share a few tricks for using Hibernate tooling in CQRS read models for rapid development. Why Hibernate? Hibernate is extremely popular. It’s also deceptively easy on the outside and fairly complex on the inside. It makes it very easy get started without in-depth understanding, misuse, and discover problems when it’s already too late. For ...

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You Probably don’t Use SQL INTERSECT or EXCEPT Often Enough

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When people talk about SQL JOIN, they often use Venn Diagrams to illustrate inclusion and exclusion of the two joined sets: While these Venn diagrams are certainly useful to understand (and remember) SQL JOIN syntax, they’re not entirely accurate, because SQL JOIN is a special type of a cartesian product, the CROSS JOIN. In a cartesian product between two sets ...

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Single Quotes in Oracle Database Index Column Specification

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In my previous post, I mentioned that a downside of using double quotes to explicitly specify case in Oracle identifiers is the potential for being confused with the use of single quotes for string literals. Although I don’t personally think this is sufficient reason to avoid use of double quotes for identifiers in Oracle, it is worth being aware of ...

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Exploring Docker’s New Content Trust Feature

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Modern development increasingly involves making use of third parties. Whether it’s programming libraries from repositories such as npm or GitHub, using platforms like Azure and AWS, or just copying a code sample from Stack Overflow it’s fair to say that most code used in an application will be written by someone other than the main developer. Docker adds to the ...

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Multi-Tenancy with separate database schemas in Activiti

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One feature request we’ve heard in the past is that of running the Activiti engine in a multi-tenant way where the data of a tenant is isolated from the others. Certainly in certain cloud/SaaS environments this is a must. A couple of months ago I was approached by Raphael Gielen, who is a student at the university of Bonn, working ...

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An answer to CircleCI’s Why we’re no longer using Core.typed

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CircleCI has recently published a very useful post “Why we’re no longer using Core.typed” that raises some important concerns w.r.t. Typed Clojure that in their particular case led to the cost overweighting the benefits. CircleCI has a long and positive relation to Ambrose Bonnaire-Sergeant, the main author of core.typed, that has addressed their concerns in his recent Strange Loop talk “Typed ...

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