The proxy generated for @Transactional behavior serves a different purpose than the scoped proxies. The @Transactional proxy is one that wraps the specific bean to add session management behavior. All method invocations will perform the transaction management before and after delegating to the actual bean. If you illustrate it, it would look like main -> … Read more
A few pointers: Debunking myths: proxies impact performance (have a look at the comments too) Java theory and practice: Decorating with dynamic proxies Benchmarking the cost of dynamic proxies
If you talk about dynamic proxies in EF there are two different types to distinguish: Proxies for lazy loading Proxies for change tracking Usually a change tracking proxy also can serve as a proxy for lazy loading. The reverse is not true. This is because the requirements for change tracking proxies are higher, especially all … Read more
I highly recommend this resource. First of all, you must understand what the proxy pattern use case. Remember that the main intent of a proxy is to control access to the target object, rather than to enhance the functionality of the target object. The access control includes synchronization, authentication, remote access (RPC), lazy instantiation (Hibernate, … Read more
It can be done using Javassist (see ProxyFactory) or CGLIB. Adam’s example using Javassist: I (Adam Paynter) wrote this code using Javassist: ProxyFactory factory = new ProxyFactory(); factory.setSuperclass(Dog.class); factory.setFilter( new MethodFilter() { @Override public boolean isHandled(Method method) { return Modifier.isAbstract(method.getModifiers()); } } ); MethodHandler handler = new MethodHandler() { @Override public Object invoke(Object self, Method … Read more
JDK Dynamic proxy can only proxy by interface (so your target class needs to implement an interface, which is then also implemented by the proxy class). CGLIB (and javassist) can create a proxy by subclassing. In this scenario the proxy becomes a subclass of the target class. No need for interfaces. So Java Dynamic proxies … Read more