Reading about Lookups I found new(for me) and awesome way to manage boolean value  used for controlling loops:

        boolean valid = false;  
        while(!valid){  
            id = this.getId();  
            valid = true;  
            for(IdValidator validator : rstl.allInstances()){  
                valid = valid && validator.validate(id); 
            }  
        }  

Using && really make me thinking why I didn't figure it out yet!

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