Why there are restrictions on EJB, but not on Servlet?

Hi,
There are some restrictions on EJB, for example,
* use the java.lang.reflect Java Reflection API to access information.
* listen on, accept connections on, or multicast from a network socket
* define a class in a package
But I can not find similar restrictions for Servlet. Why?

I understand why there are restrictions for EJB, for example:
* For security: it does not allow "java.lang.reflect Java Reflection API"
* For thread management: user thread in not allowed.
* For portability from machine to machine: file system access is not allowed.
The same issues exist for servlet. But no restrictions.

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