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in my google app engine project Log section write out
java.lang.NoClassDefFoundError: org/apache/commons/lang/Validate...
I have read java.lang.NoClassDefFoundError: org/apache/commons/lang/Validate and did as it is written. But its’ had no effect and my server is not working
The exception says, No class def found. That mean the JVM is not able to load the said class file. You will have to make sure that this class is available in the
commons-langproject.Validate that you have
commons-lang-<>.jaris added to class path of your project configuration. If not please do add the said jar file in the class path.