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Questions tagged [finalize]

A finalize() is a special method in an object-oriented language that is executed when an object is garbage collected.

A finalize(), or a finalizer, is a special method in an object-oriented language that is executed when an object is garbage collected.

Java Documentation (Javadoc) defines the moment when the finalize() is invoked as:

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

However, this may never happen in the life of a program if the object is always accessible. Due to the lack of programmer control over their execution, it is usually recommended to avoid finalizers for any but the most trivial operations.

Starting Java9. finalize() method has been officially deprecated. javadoc for Java9's java.lang.Object finalize()

228 questions
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Why does finalize() execute only after new object is created, but not after gc() is invoked?

Shouldn't finalize() execute immediately when gc() is called? The order of output result is a little unconvincing. class Test { int x = 100; int y = 115; protected void finalize() {System.out.println("Resource Deallocation is…
Sai Kiran
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I'm pretty sure finalize is still bad news on later JVMs--is there an alternative?

I would like to implement a ORM-style system that can save updates to POJOs when they are no longer reachable by the caller. I thought the reference classes could do it, but they seem to only enqueue the reference after the object has been cleared…
Bill K
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Problems with finalize method in Java

I've been having problems with finalize method in my last exercises. Seems like I have a deprecated method and I can't seem to find the newest version of finalize. I have two files and I'm required to call the 'finalize' method. Can someone give…
B K
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How to Properly Handle Class Variables with Dispose/Finalize Methods

I am at a loss on how to handle a class that contains variables with Dispose/Finalize methods. I wish for this class to contain its own Dispose/Finalize methods that call upon the Dispose for each variable; however, both the C# documentation and all…
Griffort
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Why finalize is not giving null pointer exception in the below code?

Why the below code is not giving null pointer exception in the finalize method when the objects are made null?? class Person{ public int a; public void finalize(){ //System.out.println("finalize called"+this.hashCode()); …
Radiance
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How to unload a ClassLoader that contains static native resources in Java 9

I have a library that provide a Resource class, which should be cleaned by Java 9 Cleaner. import java.lang.ref.Cleaner; public class Resource { static Cleaner CLEANER = Cleaner.create(); static class CleanerHandler implements Runnable { …
Yang Bo
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Why finalize() method has empty body?

This is how the finalize() is defined in Object class: protected void finalize() throws Throwable { } Can anyone tell me where is the code inside the method? I mean how Garbage Collector calls a method with empty body to perform cleanup activities…
Sagar Panchal
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What does "finalize objects on finalization queue" do?

When I open the Java Console in Java SE 7 Update 76, I'm shown a list of keyboard shortcuts I can use for debugging. The shortcut for F is labeled finalize objects on finalization queue. When I run this shortcut, it prints the following information…
Stevoisiak
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Java Why don't finalize method work after destroying object?

I tried to do some example to learn how finalize method work. but I can't get my output in the console that I expected. why finalize method didn't work in the following example after obejct is destroyed ? package work2; class Foo { protected…
Nomad
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Memory leak on Wildfly 10.1.0.FINAL (java.lang.ref.Finalizer / ActiveMQConnection)

We have a java web application that sends (JobsController.java) and receives messages (JMSMessageListener.java) via JMS. After running the application under constant load for 24 hours and taking heap dumps, I observe a constant increase in memory…
Choesang
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Shared OpenGL resources: delete with finalize() or implement reference counting?

I write a 3d model library. Many different models, can share same OpenGL resources, as textures, buffers, programs, vertex-attribute-objects etc. When a model is not needed anymore, I delete it. So, if OpenGL resources go unreferenced, must be…
Chameleon
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How To Debug Override finalize() Method In Java?

As we know about this like... The java.lang.Object.finalize() is called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to …
Sahar Jabeen
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CLI Native objects getting stuck in gen2 and not garbage collected

I am working on this high frequency production system. There is a C# / CLI layer which calls into a C++ library. What we are observing is that managed objects are going into generation 2 of the garabage collector and getting 'stuck'. Eventually the…
UltimateDRT
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Java object finalize inside Collection

I thought Object finalize() is always called before the object is retired. In this test, I observed that when object is added to a collection and collection is cleared, the finalize is not called on the object. It is definitely called on the list.…
Vortex
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Delete Reference of Inner Class

I have two classes - Temp1.java and State.java . * Temp is a running class. * The State class contained an additional inner class - Citizen. I haven't the problem for create the objects, but I can't remove them if I need that. For example: I create…
morris
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