[rules-users] can we mix java n mvel dialect in LHS

[techy]

Hello,
I have some drools beginner questions
1.what is default dialect if it is not specified?
2. can We mix java and mvel syntax in LHS?
Ex:
class Cheese(String type,Set<String> ingredients)
Is this valid LHS? 
when  cheese : Cheese(ingredients.getIngredients().size > 3,type ==
"American")

3. In my sample program , I have a following condition which never executes
even if i have  "sugar" ingredient. any help?
when cheese : Cheese(ingredients contains "sugar")
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