InvocationHandler
that do not proxy standard
Object
methods like hashCode()
, equals()
, and toString()
.
Failing to handle these methods might cause unexpected problems upon calling them on a proxy instance.
Example:
InvocationHandler myHandler = (proxy, method, params) -> {
System.out.println("Hello World!");
return null;
};
Runnable myProxy = (Runnable) Proxy.newProxyInstance(
Thread.currentThread().getContextClassLoader(),
new Class[] {Runnable.class}, myHandler
);
This code snippet is designed to only proxy the Runnable.run()
method.
However, calls to any Object
methods, like hashCode()
, are proxied as well.
This can lead to problems like a NullPointerException
, for example, when adding myProxy
to a HashSet
.
New in 2020.2