Create simple POJO classes (bytecode) at runtime (dynamically)

Question

I\'ve the following scenario..

I am writing some tool that run user-entered query against the database and return the result..

The simplest way is to return

Answer 1

What would the caller do with a class that is generated on the fly and which his code therefore cannot know? The only way to access it would be via reflection. Returning a List or Map would actually be a much cleaner and more usable design.