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Below is a line from a Struts config file. What do 'comp/*/*/*' and {1} mean?
<action name="comp/*/*/*" class="com.fxoa.comp.{1}.action.extjs.{2}Action" method="{3}">
They are called as
Wildcardsmappings when your application size growsWildcardscan be used to combine similar mappings into one more generic mapping.What you are showing in your example is also known as wildcard mapping.It can be done at 2 levels
Read official documentation for details
Wildcard-Mappings
WildcardMethod