java.lang.NoClassDefFoundError: org/apache/commons/lang/Validate

Question

Why does the following happen and how can I fix it?

Exception in thread \"main\" java.lang.NoClassDefFoundError: org/apache/commons/lang/Validate
    at org.         


        

Answer 1

You need to download the Apache Commons/Lang and make sure it's included in CLASSPATH (or if using IDE, make sure that all required libraries are included in the build configuration).

See also

• Java Tutorials/Platform Environment/PATH and CLASSPATH