Developing DL-Learner using Eclipse

Instructions on how to prepare Eclipse for developing DL-Learner:

1. Make sure you have Java 6, Maven 2 and Eclipse installed.
2. Install the Subclipse plugin for Subversion support.
3. Install the Eclipse m2e Maven plugin for Maven support and m2e extras “Maven SCM handler for Subclipse”.
4. “File >> New >> Other...” >> “Checkout Maven Projects from SCM”
5. Set SCM URL type to “svn” and enter https://dl-learner.svn.sourceforge.net/svnroot/dl-learner/trunk as URL
6. Choose “Finish”

You should now be ready to develop DL-Learner in Eclipse. DL-Learner uses the standard code conventions with the only difference that the maximum line length is 100 instead of 80 (Project >> Properties >> Java Code Style >> Formatter >> Edit >> Line Wrapping Tab >> enter “100” as maximum).

Some Java 6 versions ship with restrictions of the internal com.sun.net classes, since there is no long term support for those classes. If you see access restriction errors in Eclipse, then go to “Window” >> “Preferences” >> “Java” >> “Compiler” >> "Errors / Warnings" >> “Deprecated and Restricted API” >> “Forbidden Reference” and set to “Ignore” instead of “Error”. This is only necessary in some Java 6 JDKs.

Similar instructions apply to other IDEs.

Hint: DL-Learner is a Maven multi module project. If you have several such projects in Eclipse, the package explorer can become cluttered. We recommend to put all DL-Learner modules in a working set. We also recommend to use the hierarchical view in the package explorer, because DL-Learner contains many nested packages.