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// Validate that a number is odd 
@Validate(expression="thisself % 2 == 1") private int oddNumber; 

// Validate that this number is bigger than the odd number 
@Validate(expression="oddNumber != null && self > oddNumber") private long biggerNumber; 

// Validate that a username is the current user's, or the current user is 'root' 
@Validate(expression="context.user.name=='root' || self==context.user.name") private String name;