![]() The proposal does not involve developing an alternative resolver for the JDK. Motivations for this effort include better enablement of Project Loom, for concurrency and new programming models in Java, along with integrating new network protocols, customization, and enabling testing. For the Internet-address resolution SPI, the proposal is to define an SPI for host and name address resolution so that Inet.Address can make use of resolvers other than the platform’s built-in resolver.(See JDK Enhancement Proposal 421 for details.) Given the problems with finalization, developers are advised to use alternative techniques to avoid resource leaks, namely try-with-resources statements and cleaners. This seems like an effective safety net for preventing resource leaks, but flaws exist including unpredictable latency, with a long time passing between when an object becomes unreachable and when its finalizer is called unconstrained behavior, with finalizer code able to take any action, including resurrecting an object and making it reachable again finalizer is always enabled, with no explicit registration mechanism and finalizers can run on unspecified threads in an arbitrary order. The garbage collector will schedule the finalizer of an unreachable object to be called before it reclaims object memory in turn, the finalize method can take actions such as calling the object’s close. A class can declare a finalizer - the method protected void finalize() - whose body releases any underlying resource. Introduced in Java 1.0, finalization was intended to help avoid resource leaks. Goals of the proposal include helping developers understand the dangers of finalization, preparing developers for its eventual removal, and providing simple tools to help detect reliance on finalization. The proposal calls for a command-line option to disable finalization and deprecation of all finalizers and finalization methods in the standard Java API. It will be disabled by default in a feature release and removed altogether in a later release. ![]() Finalization is enabled by default for now but can be disabled to facilitate early testing. It also has a difficult programming model. ![]() Finalizer has flaws that cause significant real-world problems in security, performance, reliability, and maintainability. ![]()
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