I am new to eclipse and java. The way I understand the directory structure is that you have source packages in src/ folder and they are built into the /build folder.
It was all working fine until recently. But today I tried debugging after creating a new class and it was throwing ClassNotFoundException when I do F11. On investigation, I found that it was using older versions of even the existing classes and not the new builds, and there was no .class file corresponding to my new class. I checked the build/ directory and it seems the builds are also old as it is showing yesterdays last modified time despite the fact that I have made changes today and tried to debug it. This problem is not limited to debugging as I exported the class into a jar file and it is still using yesterday’s jar file. What could be the issue here? Is it not ‘building’ the classes? Have I messed up the default ‘build’ folder somewhere?
First you should check, that the “build automatically” feature is activated (menu “Project/Build automatically”).
Next you should do a refresh of your whole project to tell eclipse to check for file changes that occured outside of the eclipse IDE.
If all that doesn’t help, do a “Project/Clean…/clean all projects” inside eclipse.