Bug ID: JDK-8253568 Replace and mitigate Object.finalize() uses in JDK libraries

JDK-8253568 : Replace and mitigate Object.finalize() uses in JDK libraries

Type: Enhancement
Component: core-libs
Sub-Component: java.lang

Priority: P4
Status: Open
Resolution: Unresolved

Submitted: 2017-05-05
Updated: 2024-10-31

Versions (Unresolved/Resolved/Fixed)

The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

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Other
tbdUnresolved

Related Reports

Relates :	JDK-8297976 - Remove sun.net.ProgressMonitor and related classes
Relates :	JDK-8263905 - Remove finalize methods for SocketInput/OutputStream
Relates :	JDK-8284855 - Update needed to Cleaners added to jdk.crypto.cryptoki
Relates :	JDK-8273102 - Delete deprecated for removal the empty finalize() in java.desktop module
Relates :	JDK-8229842 - ☂ Eliminate use of deprecated finalize method in JavaFX
Relates :	JDK-8266936 - Add a finalization JFR event
Relates :	JDK-8285872 - JFR: Remove finalize() methods
Relates :	JDK-8302845 - Replace finalizer usage in JNDI DNS provider with Cleaner
Relates :	JDK-8195059 - Update java.net Socket and DatagramSocket implementations to use Cleaner
Relates :	JDK-8212136 - Remove finalizer implementation in SSLSocketImpl
Relates :	JDK-8284368 - Remove finalizer method in jdk.crypto.cryptoki
Relates :	JDK-8284490 - Remove finalizer method in java.security.jgss
Relates :	JDK-8184744 - Replace finalizer in crypto classes with Cleaner
Relates :	JDK-8080225 - FileInput/OutputStream/FileChannel cleanup should be improved
Relates :	JDK-8164512 - Replace ClassLoader use of finalizer with phantom reference to unload native library
Relates :	JDK-8185582 - Update Zip implementation to use Cleaner, not finalizers
Relates :	JDK-8263903 - Use Cleaner instead of finalize to auto stop Timer thread
Relates :	JDK-8302899 - Executors.newSingleThreadExecutor can use Cleaner to shutdown executor

Sub Tasks

JDK-8283660 :

Convert com/sun/jndi/ldap/AbstractLdapNamingEnumeration.java finalizer to Cleaner - In Progress

Description

Object.finalize was deprecated in JDK 9. Existing uses of finalize in the JDK need to be replaced or removed. In some cases specification changes are necessary. 

Do a survey of open/src/<module> 'finalize()' usage:

java.base/share/classes/java/lang/Enum.java (keep: empty, final)
java.base/share/classes/java/lang/Object.java (keep: empty, compat)
java.base/share/classes/java/util/concurrent/ThreadPoolExecutor.java (empty)

java.desktop/macosx/classes/apple/laf/JRSUIControl.java
java.desktop/macosx/classes/sun/awt/CGraphicsEnvironment.java
java.desktop/macosx/classes/sun/font/CFont.java
java.desktop/macosx/classes/sun/font/CStrike.java
java.desktop/macosx/classes/sun/lwawt/macosx/CFRetainedResource.java
java.desktop/macosx/classes/sun/lwawt/macosx/CPrinterJob.java
java.desktop/share/classes/com/sun/imageio/plugins/common/SubImageInputStream.java (empty)
java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageWriter.java (empty)
java.desktop/share/classes/com/sun/imageio/plugins/tiff/TIFFBaseJPEGCompressor.java
java.desktop/share/classes/com/sun/imageio/plugins/tiff/TIFFJPEGDecompressor.java
java.desktop/share/classes/com/sun/imageio/plugins/tiff/TIFFOldJPEGDecompressor.java
java.desktop/share/classes/com/sun/imageio/stream/StreamFinalizer.java
java.desktop/share/classes/com/sun/media/sound/AbstractMidiDevice.java
java.desktop/share/classes/com/sun/media/sound/JavaSoundAudioClip.java
java.desktop/share/classes/java/awt/Graphics.java
java.desktop/share/classes/java/awt/PrintJob.java
java.desktop/share/classes/java/awt/color/ICC_Profile.java (empty)
java.desktop/share/classes/java/awt/image/ColorModel.java (empty)
java.desktop/share/classes/java/awt/image/IndexColorModel.java (empty)
java.desktop/share/classes/javax/imageio/spi/ServiceRegistry.java
java.desktop/share/classes/javax/imageio/stream/FileCacheImageInputStream.java (empty)
java.desktop/share/classes/javax/imageio/stream/FileImageInputStream.java (empty)
java.desktop/share/classes/javax/imageio/stream/FileImageOutputStream.java (empty)
java.desktop/share/classes/javax/imageio/stream/ImageInputStreamImpl.java
java.desktop/share/classes/javax/imageio/stream/MemoryCacheImageInputStream.java (empty)
java.desktop/share/classes/javax/swing/text/StringContent.java
java.desktop/share/classes/sun/java2d/SunGraphics2D.java (empty)
java.desktop/share/classes/sun/print/PeekGraphics.java (empty)
java.desktop/share/classes/sun/print/PrintJob2D.java
java.desktop/share/classes/sun/print/ProxyGraphics.java (empty)
java.desktop/share/classes/sun/print/ProxyGraphics2D.java (empty)
java.desktop/unix/classes/sun/awt/X11InputMethodBase.java
java.desktop/windows/classes/sun/awt/windows/WInputMethod.java

java.naming/share/classes/com/sun/jndi/ldap/AbstractLdapNamingEnumeration.java
java.naming/share/classes/com/sun/jndi/ldap/LdapClient.java
java.naming/share/classes/com/sun/jndi/ldap/LdapCtx.java
java.naming/share/classes/com/sun/jndi/ldap/sasl/DefaultCallbackHandler.java

java.rmi/share/classes/sun/rmi/log/LogInputStream.java

java.security.sasl/share/classes/com/sun/security/sasl/CramMD5Base.java
java.security.sasl/share/classes/com/sun/security/sasl/PlainClient.java

java.smartcardio/share/classes/sun/security/smartcardio/CardImpl.java

jdk.crypto.mscapi/windows/classes/sun/security/mscapi/CKey.java

jdk.naming.dns/share/classes/com/sun/jndi/dns/DnsClient.java

jdk.naming.rmi/share/classes/com/sun/jndi/rmi/registry/RegistryContext.java
(RegistryContext.finalize() and BindingEnumeration.finalize())

jdk.security.jgss/share/classes/com/sun/security/sasl/gsskerb/GssKrb5Base.java

jdk.zipfs/share/classes/jdk/nio/zipfs/ZipFileSystem.java

Some are awaiting removal of backward compatible work arounds in a appropriate future release.

Comments

Removed jdk.naming.dns/share/classes/com/sun/jndi/dns/DnsContext.java from the list. Its finalizer has been commented out for quite some time.
28-02-2023
java.base/share/classes/java/util/concurrent/Executors.java removed by JDK-83202899.
28-02-2023
java.base/share/classes/sun/net/www/MeteredStream.java finalizer removed by JDK-8297976.
14-12-2022
(sorted the finalizer list in Description)
24-02-2021
I've moved this into the JDK project as an Enhancement since it's pretty much a straightforward though work item. Subtasks can be created for smaller chunks of work as necessary.
24-09-2020
Jira items labeled with "finalizer". https://bugs.openjdk.java.net/issues/?jql=labels%20%3D%20finalizer%20and%20(%20fixVersion%20%3D%2010%20or%20fixVersion%20is%20empty)
02-12-2017