How to get the source code of Fiji?

I am a user of Fiji. Currently, I am facing a problem with obtaining the source code of Fiji.

I used git GUI to get the source code from: https://github.com/fiji/fiji/
And then used eclipse to run the project: File->Import->Maven->Existing Maven Projects

After running the project, I got an error as follows:
[ECLIPSE HELPER] Indexing annotations…
[ERROR] Cannot create plugin: class=‘target.classes.sc.fiji.app.FijiApp’, name=‘Fiji’, priority=0.0, enabled=true, pluginType=App
org.scijava.InstantiableException: Class not found: target.classes.sc.fiji.app.FijiApp
at org.scijava.plugin.PluginInfo.loadClass(PluginInfo.java:290)
at org.scijava.plugin.PluginInfo.createInstance(PluginInfo.java:299)