Difference between server library and class library in Netbeans?

Question

What is the difference between a server library and a class library in Netbeans?

Answer 1

A server library refers to a library of applications or web applications, such as servlet-api.jar in Tomcat or jboss.all.jar in JBoss.

while

a ClassLibrary refers to a library outside the standard scope of a server library, for example log4j.jar. The class library is also a valid .jar class archive written by someone like you.