![]() ![]() With Java 8, there is the option to use the back-end of the lambda expression and method reference language feature at runtime. Of course, wrong argument types will create an appropriate RuntimeException. It has the so-called “polymorphic signature” which means you can invoke it with arbitrary argument types without auto-boxing nor array creation. The access checks for a MethodHandle are performed when acquiring it but not when invoking it. The big advantage is that, unlike the other two, it even works in security restricted environments. Since Java 7 there is an alternative to both, the MethodHandle. Then only the minor performance loss of autoboxing and varargs array creation remains. Alternatively you can invoke setAccessible(true) on a Method instance to turn the security checks off. So your generated class will be checked on loading and instantiation only which can be a big win. You can’t beat that.īut more important is that Reflection does security checks on every invocation. So in the Reflection implementation there are different types of invocation handlers, using either generated code or native code. when invoking a private method as you can’t generate a legal class file invoking it. ![]() This does not work in special cases, e.g. There’s one catch: if applicable, Reflection does the same trick internally. invokes the method discovered at runtime, and implements an interface known at compile-time so that it’s possible to invoke the generated method in a non-reflective way using that interface. This generated class ought to perform the desired action, e.g. One alternative to Reflection is to generate a class file dynamically. ![]()
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