Is code injection possible in Java?

Question

nowadays you can read much about code injection, exploits, buffer-, stack- and heap-overflows etc. leading to inject and run code. I wonder what of this stuff is relevant for Ja

Answer 1

If the server application creates bytecode at runtime (for example with BCEL or Javassist), and if this creation can be influenced by user input, then a code injection is possible.

However, if you application uses no magic (which should be 99% of all applications), it will not be possible.