Where can I find the definition of rules for using reflection?

Rules for using reflection in Java can be found in the official Oracle documentation on Java Reflection API. It describes classes from the java.lang.reflect package, their methods, and limitations. It is also useful to review sections on security and performance when using reflection, as it can affect the application's operation.

In addition to the official documentation, you can study the Java Language Specification (JLS) and Java Virtual Machine Specification (JVMS), which describe mechanisms for working with classes and objects at runtime.

Example link to the documentation:

• https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/package-summary.html

For practical understanding, it is recommended to study examples and articles dedicated to reflection, as well as its limitations, such as access to private fields and methods, security, and performance.