John Mercier

VisualVM is an application for monitoring and performance analysis of java applications. The package for nixos is located here. There are a few tips I learned when performing this upgrade.

Typically build libraries with ant tasks are carefully managed in ~/.ant/lib or $ANT_HOME/lib by the developer. Every project using ant will have those tasks on the classpath every time ant is invoked. This can be problematic to developers working on multiple ant projects. It can be especially problematic for CI servers building ant projects. Projects cannot select different versions of build tasks making the build none deterministic and dependent on the environment the build is executed in. Wouldn’t it be nice if build libraries could be added to an ant project dynamically within the build.xml file? This can be made possible by downloading the libraries from a repository like maven central and adding the tasks in the project’s build file.

The ant build system does not come with dependency management. Developers either need to manage dependencies manually or use ivy. Dependency management is not the easiest task to perform manually and it distracts developers from writing their projects. Ivy is capable of downloading dependencies from maven central for use in the project. Ivy will be used to provide build libraries to the ant project so tasks may be added but first ivy tasks must be added to the project.

One thing I don’t like about jsp is that it looks like html. The default engine for JBake is freemarker. Like many other template engines freemarker adds expressions to the html language. I would much rather work with something that looks like groovy so I’m going to try out groovy’s MarkupTemplateEngine as the template engine for JBake.

In a previous post JBake was added to nixos. Now it is time to convert this blog to JBake. As with any user blog hosted by github the content needs to be posted to a git repository for the user. My repository is moaxcp.github.com. I’m using a second repository for the sources of the site.

There are a few tools I want to use. Gradle to build the sources and publish the blog to github. Travis CI to run the Gradle tasks anytime the sources change.

To get started I had to setup gradle and JBake in a workflow for converting posts and viewing the site.

JBake is a static site/blog generator. I have been using jekyll for this blog but I would like to try something new. My main operating system is NixOS which does not have a package to install JBake. It will need to be added. I have already updated visualvm and notion for NixOS but adding a new package is something I haven’t tried yet.

This post will walk through the process of developing the JBake nix expression for the nixpkgs repository.

One step in installing nixos I had trouble performing was connecting to wifi. On the minimal install boot wpa_supplicant is installed but there is no service. There are a few instructions for this online but this is what I did to get it working.