public abstract String value
The default deserves
a bit of explanation. JSR-175 (which defines annotations) says that
Java annotation parameters can only be ConstantExpressions, which
can be primitive/string literals, but not null
.
In this case, we use this string as a substitute
for null
; in practice, TestNG will pass null
to your code, and not the string "null", if you do not specify
a default value here in this parameter.
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