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Author Archives: Rudiger Herrmann

How to Safely Use SWT’s Display asyncExec

Most user interface (UI) toolkits are single-threaded and SWT is no exception. This means that UI objects must be accessed exclusively from a single thread, the so-called UI thread. On the other hand, long running tasks should be executed in background threads in order to keep the UI responsive. This makes it necessary for the background threads to enqueue updates ...

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gonsole weeks: content assist for git commands

While Eclipse ships with a comprehensive Git tool, it seems that for certain tasks many developers switch to the command line. This gave Frank and me the idea, to start an open source project to provide a git console integration for the IDE. What happened so far during the gonsole weeks can be read in git init gonsole and eclipse ...

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How to manage Git Submodules with JGit

For a larger project with Git you may find yourself wanting to share code among multiple repositories. Whether it is a shared library between projects or perhaps templates and such used among multiple different products. The Git built-in answer to this problem are submodules. They allow putting a clone of another repository as a subdirectory within a parent repository (sometimes ...

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Using the AutoValue Code Generator in Eclipse

My colleague Moritz of EclipseSource recently came across Google Auto, a collection of Java code generators. AutoValue is one of them and generates Java code for immutable objects. It provides an annotation and an annotation processor to generate Java code for immutable value objects. The current version is labelled RC1 and a 1.0 release is soon to come. The idea ...

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A JUnit Rule to Conditionally Ignore Tests

I always believed that using @Ignore to deactivate tests is a bad idea. Except, maybe as one way to put tests that fail intermittently into quarantine to attend to them later (as Martin Fowler describes it here). This bears the danger that the test suite decays as more and more tests keep getting ignored and forgotten. Therefore you should have ...

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An Introduction to the JGit Sources

JGit is a pure Java library implementing the Git version control system. It is an Eclipse project and started out as the Git library for EGit, which provides a Git integration into Eclipse. Meanwhile JGit has further adopters like in Gerrit, GitBlit, GitClient Plugin for Jenkins (work in progress), … Its permissive license, few dependencies and low requirements make it ...

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Configure Your OSGi Services with Apache Felix File Install

A recent post about Managed Services reminded me of a feature in Apache Felix File Install that I found worth mentioning. While working on a project with Holger, I learned from him that File Install cannot only be used to manage bundles. It also monitors configuration files and updates Managed Services when their respective configuration changes. File Install can also ...

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An Automated OSGi Test Runner


Among my fellow team members I was known for notoriously forgetting to maintain the (JUnit) test suite. I just can’t get this extra step of manually adding a test to a suite into my fingers. Fortunately there are continuous integration servers that collect tests by a naming pattern. If one of the orphan tests I introduced fails, it stands out ...

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