问题
I just came across an error when using NetBeans, and I wanted to post my findings (possible this is old news). Perhaps this will save some people the headache of debugging a similar problem that I just encountered. I don't think I'm abusing anything here... stack overflow's SEO is pretty good :)
I refactored a class in NetBeans (JavaFX project), and from that point on I got a "java.lang.NoClassDefFoundError" for that particular refactored class.
I fixed the error by simply doing a "Clean and Build Project." This apparently deleted whatever cache file or erroneous file/class reference. I don't think this is a Netbeans bug... hoping it was just one of those "flukey" moments.
Cheers!
回答1:
I have those issues from time to time when I write new code (or create new code). This is because I use the 'build' function instead of 'clean & build'.
Most of the time, the proper set of class is compiled (or recompiled), but there are situations where newly compiled classes are not compatible with already compiled classes. That's when I get java.lang.NoClassDefFoundError. Not a big deal. Just need to clean and recompile everything.
来源：https://stackoverflow.com/questions/3425801/netbeans-refactor-class-java-lang-noclassdeffounderror