Eclipse is being a pain

It seems as though any changes that make to one of my classes is not being recompiled which leads to me getting a no such field exception during run time. When I make a change, I save the file and then export the jar. What am I doing wrong? It has always worked fine like this before...

 

This sounds to me like your workspace is not synchronized with the local file system. Try this:
Click on Project > Clean... > Choose your Project
Then right-click the project in the Project Explorer and click Refresh
Export your project again and make sure, that you choose all classes you need to export (usually the whole src-folder).

 

Thanks for the quick reply. I followed each of your steps, however, I'm getting the same errors. I just updated Eclipse and now I am going to update Java from 1.6 to 1.7 to see if that changes anything. And, in case anyone is wondering, I have made sure that I'm using the same bukkit and craftbukkit versions (1.2.3-R0.1).