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Hi,
I am new to EJB.Can anyone say me whether I can return ArrayList from my bean method ?
That is, all my input and output parameters of my bean method must always be serializable objects ?

Thanks in advance,
 
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Yes, you can because ArrayList is Serializable.
 
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I think you may to be sure that the objects in the ArrayList are also Serializable.
 
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Not necessarily if you are using Local EJBs. Remote EJBs are extension of RMI and if your objects which are not serializable or Remote in nature then there can be issues at runtime.
 
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