This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Yes, you can have script in body of the Classic tag. The script is process if the body-content is set to JSP. If is tagdependent it is treated as simple text. for body-content is empty/scriptless it is translation error.
Answer to your second question, it will throw exceptiom.