Setting up an IDE is always going to be a personal thing, but here’s what we think is a starting standard for Java development in Eclipse.
All the configuration options are under Window -> Preferences.
Formatting (under Java -> Code style -> Formatter)
Firstly and most importantly, we use the Google coding style. While we might not 100% agree with every rule; it’s a widely known, generally good and comprehensive start point which has formatters available for Eclipse.
To install the formatter:
- Download the formatter from https://raw.githubusercontent.com/google/styleguide/gh-pages/eclipse-java-google-style.xml.
- Import by visiting Window -> Preferences -> Java -> Code style -> Formatter and clicking Import.
- Ensure the active profile says “GoogleStyle” and click Apply.
- Under General -> Editors -> Text Editors check “Insert spaces for tabs”.
Whilst the spaces vs tabs is an eternal debate, we standardise on spaces and thankfully it keeps CheckStyle quiet.
Maven (under Maven)
When debugging in Eclipse its nice to have the source code and javadoc of external libraries at your fingertips. Since we use Maven as our build system:
- Window -> Preferences -> Maven and check Download Artifact Sources and Download Artifact JavaDoc.
We have a Maven proxy on our network, which reduces duplicate downloads for multiple people and workspaces, but if you are bandwidth limited then this option might not be for you.
Clean up (under Java -> Code Style -> Clean up)
Clean up is used to mass-tidy your code. Eclipse has one built in but we have something stricter. Basically this allows you mirror your Save Actions (see below), but you can import and export it in Eclipse.
Our clean up configuration is basically everything on, except “Sort members” and “Add unimplemented methods”. (We’ll put a link to the exported file some day!)
Save actions (under Java -> Editor > Save actions)
Why this is different to Clean up we don’t know, but that’s Eclipse. Sadly you can’t import here, and really this is more important that clean up (since it runs automatically on save).
You should enable everything! That is:
- Format source code (format all lines)
- Organize imports
- Additional actions
Under Additional actions, we mirror our Clean up actions except where it gets in the way of development. For example, we don’t remove unused local variables or unused private members since that often means they get deleted mid-development (i.e. if you press save before you’ve finished coding a method). The same is true for final variables.
So we use Save Actions to get a reasonable clean output during development, then perform clean up prior to committing.
Type filters (Java -> Appearance -> Type Filters)
It’s really annoying when Eclipse offers you
java.awt.List as the primary autocomplete option, but you can fix that.
Add the following packages to improve your sanity:
java.awt.*(hide the out of date!)
org.apache.log4j.*(hiding the logging frameworks we’re not using, we use Slf4j)
com.sun.*(you probably shouldn’t be playing with this)
scala.*(since we don’t use much Groovy or Scala we don’t want to see their types)