Summary

Remove Finalize methods from ZipFile, Inflater and Deflater

Problem

The finalize methods of ZipFile, Inflater and Deflater were deprecated for removal in JDK 9 and should be removed.

Solution

The finalize methods will be removed from ZipFile, Deflator, and Inflator. As of JDK 9, these methods are no-ops.

Prior to JDK 9:

• ZipFile::finalize would call the close method. The recommendation has been to explicitly call close or use try-with-resources to close files. With this change the ZipFile close method will no longer be called when a ZipFile is found to be unreachable.

• The Inflator::finalize and Deflator::finalize methods would call the end method. The recommended cleanup for a compressor is to explicitly call then end method when it is no longer in use. If the end is not invoked explicitly the resource of the compressor will be released when the instance becomes unreachable.

Specification

java.util.zip.ZipFile

Remove the Implementation Note:

If this ZipFile has been subclassed and the close method has been overridden, the close method will be called by the finalization when ZipFile is unreachable. But the subclasses should not depend on this specific implementation; the finalization is not reliable and the finalize method is deprecated to be removed.

and removes the method:

protected void finalize() throws IOException {}

java.util.zip.Deflater:

Remove the Implementation Note:

If this Deflater has been subclassed and the end method has been overridden, the end method will be called by the finalization when the deflater is unreachable. But the subclasses should not depend on this specific implementation; the finalization is not reliable and the finalize method is deprecated to be removed.

and removes the method:

protected void finalize() throws IOException {}

java.util.zip.Inflater:

Remove the Implementation Note:

If this Inflater has been subclassed and the end method has been overridden, the end method will be called by the finalization when the inflater is unreachable. But the subclasses should not depend on this specific implementation; the finalization is not reliable and the finalize method is deprecated to be removed.

and removes the method:

protected void finalize() throws IOException {}