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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()

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finalize() called on strongly reachable objects in Java 8

We recently upgraded our message processing application from Java 7 to Java 8. Since the upgrade, we get an occasional exception that a stream has been closed while it is being read from. Logging shows that the finalizer thread is calling…
Nathan
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In Java, how to check that AutoCloseable.close() has been called?

I am authoring a java library. Some of the classes that are meant to be used by library users, hold native system resources (over JNI). I'd like to ensure that the user "disposes" these objects, as they are heavy, and in a testsuite they may cause…
haelix
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Should Java 9 Cleaner be preferred to finalization?

In Java, overriding the finalize method gets a bad rap, although I don't understand why. Classes like FileInputStream use it to ensure close gets called, in both Java 8 and Java 10. Nevertheless, Java 9 introduced java.lang.ref.Cleaner which uses…
Aleksandr Dubinsky
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Java and manually executing finalize

If I call finalize() on an object from my program code, will the JVM still run the method again when the garbage collector processes this object? This would be an approximate example: MyObject m = new MyObject(); m.finalize(); m =…
Iker Jimenez
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what will the Finalizer thread do if there is a infinite loop or deadlock in the Java finalize method

what will the Finalizer thread do if there is a infinite loop or deadlock in the Java finalize method.
andy
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How to ensure finalize() is always called (Thinking in Java exercise)

I'm slowly working through Bruce Eckel's Thinking in Java 4th edition, and the following problem has me stumped: Create a class with a finalize( ) method that prints a message. In main( ), create an object of your class. Modify the previous…
MattDs17
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What is the difference between finalize and dispose in .net?

Possible Duplicate: Finalize vs Dispose Hi, Recently I was quizzed in an interview about finalize and dispose. When is each one of them used and how is Garbage Collector related to them. Kindly share links to enlighten more on the topic. Kindly…
HotTester
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What is difference between System.gc() and finalize() method in java?

I am confuse in between system.gc() and finalize() method of java. We can't force to collect garbage object to JVM. We are allow to write both methods in our java code then if both are used for garbage collection, then what is point in providing two…
sayali
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What is the purpose of finalization in Java?

My understanding of finalization is this: To clean up or reclaim the memory that an object occupies, the Garbage collector comes into action. (automatically is invoked?) The garbage collector then dereferences the object. Sometimes, there is no way…
user244333
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Why are some some resources in Java not garbage collected and must be closed or autoclosed?

If you are lucky some of these classes implement AutoClosable but sometimes you just have to be careful and inspect the existing methods to notice that there is a close, destroy or shutdown method (or what ever the author decided to name it). This…
Christophe Roussy
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In Java9, finalizers have been deprecated, instead cleaners have been introduced. What is the difference between the two?

In Java9, finalizers have been deprecated and new concept of cleaners have been introduced. What was the specific reason for it? Is there any particular scenario or reason where cleaners should be preferred over finalizer(given that none of them are…
Chota Bheem
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Gracefully finalizing the SoftReference referent

I am using a search library which advises keeping search handle object open for this can benefit query cache. Over the time I have observed that the cache tends to get bloated (few hundred megs and keeps growing) and OOMs started to kick in. There…
mindas
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why the reference don't put into reference queue when finalize method overrided

public class Test { public static void main(String[] args) throws Exception { A aObject = new A(); ReferenceQueue queue = new ReferenceQueue<>(); PhantomReference weak = new PhantomReference<>(aObject, queue); …
gesanri
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Why does the traditional Dispose pattern suppress finalize?

Assuming this as the traditional Dispose pattern (taken from devx but seen on many websites) class Test : IDisposable { private bool isDisposed = false; ~Test() { Dispose(false); } protected void Dispose(bool disposing) { if…
Lazlo
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How to use PhantomReference as finalize() Replacement

Javadoc 8 for PhantomReference states: Phantom references are most often used for scheduling pre-mortem cleanup actions in a more flexible way than is possible with the Java finalization mechanism. So I tried creating a thread that is calling the…
notes-jj
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