10.2.13. Bean Proxies

Problems of dependency injection, which are solved by using proxies

• Performance - Proxies are much faster than dependency injection, so you can use them in beans which need good performance.
• Thread safety - Proxies forward requests to the correct bean instance, even when multiple threads access a bean at the same time. Dependency injection does not guarantee thread safety.

Types of classes that cannot be proxied

• Primitive types or array types
• Classes that are final or have final methods
• Classes which have a non-private default constructor