Is it compulsory to specify transaction attributes for all Component interface business methods? even for onMessage() of Message-Driven-bean also need compulsory transaction attribute? is there like default transaction attribute settings.
In HFE book for stateless session bean example there is no transaction attribute.
Howdy -- the list we have in the book is on page 498, and it looks like this;
Session beans: - Business methods in the component interface -- (the ones YOU write) (doesn't matter if it is stateless or stateful)
Entity beans: - Business methods in the component interface -- ALL home interface methods written by the bean provider, as well as the remove() method from EJBHome or EJBLocalHome (so that also includes create methods)
Message-driven beans: - onMessage()
Does that help?
Technically there are no *default* transaction attributes according to the spec! But...there *are* some vendors that provide default transaction attributes. So, it doesn't matter how they get into the DD, but according to the spec, they MUST be there. You might be deploying in an app server that does it for you, however, either through deployment tools that simply add it to the DD, or after the fact. But for the exam, you need to assume that they must be there.
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