Simple lookup test : 
Max exemptions value : 15
list() on /comp/env Context : 
Binding : mail: org.apache.naming.NamingContext
Binding : minExemptions: java.lang.Integer
Binding : maxExemptions: java.lang.Integer
Binding : jdbc: org.apache.naming.NamingContext
Binding : ejb: org.apache.naming.NamingContext
Binding : name3: java.lang.Integer
Binding : foo: org.apache.naming.NamingContext
listBindings() on /comp/env Context : 
Binding : mail: org.apache.naming.NamingContext:org.apache.naming.NamingContext@957573
Binding : minExemptions: java.lang.Integer:1
Binding : maxExemptions: java.lang.Integer:15
Binding : jdbc: org.apache.naming.NamingContext:org.apache.naming.NamingContext@51ee0a
Binding : ejb: org.apache.naming.NamingContext:org.apache.naming.NamingContext@e301e0
Binding : name3: java.lang.Integer:1
Binding : foo: org.apache.naming.NamingContext:org.apache.naming.NamingContext@1901ca8