1. A computer-implemented method for enforcing runtime policies relating to execution of computer code and data of an application, in a networked computing environment, comprising: applying a first annotation to a first portion of computer code, the first annotation comprising metadata defining a set of runtime policies for executing the first portion of computer code and associated data; applying a second annotation to a second portion of computer code, the second annotation comprising metadata defining a set of runtime policies for executing the second portion of computer code and associated data; receiving a request to run an application; and enforcing, at a runtime of the application, the set of runtime policies for executing the computer code by running the first portion of the computer code without running the second portion of the computer code.