The dreaded java.lang.NoClassDefFoundError

Question

I\'ve looked through many of the existing threads about this error, but still no luck. I\'m not even trying to package a jar or use any third-party packaging tools. I\'m s

Answer 1

make sure your jar commons-lang-2.4.jar in classpath and not redudance.

I ever add jar file to my classpath, and have 2 file jar in my classpath. After I delete it, work smooth