RFR: JDK-8197398 (zipfs) OutOfMemoryError when talking contents of empty JAR file

Deepak Kejriwal deepak.kejriwal at oracle.com
Thu Nov 29 10:10:51 UTC 2018

Hi Roger / Lance,


Thanks for reviewing the fix. I have modified the fix as the review comments given.


Please find the below the updated webrev for fix.




From: Roger Riggs 
Sent: Wednesday, November 28, 2018 3:15 AM
To: Deepak Kejriwal <deepak.kejriwal at oracle.com>; nio-dev at openjdk.java.net
Cc: core-libs-dev <core-libs-dev at openjdk.java.net>
Subject: Re: RFR: JDK-8197398 (zipfs) OutOfMemoryError when talking contents of empty JAR file



In ZipFileSystem.java, at 1071.

 - The code will be more readable if you use character literal '/' instead of 47.

 - Save making an extra copy of the name array by testing for '/' directly in the cen array 
   and create either the full name or the name without the '/'.

 - 1073: The coding style should put the '{' on the same line as the 'if'.
   Use the file's coding style.

Thanks, Roger

On 11/27/2018 04:51 AM, Deepak Kejriwal wrote:

Hi nio-dev team,
Gentle reminder for review of below fix.
From: Deepak Kejriwal HYPERLINK "mailto:deepak.kejriwal at oracle.com"<deepak.kejriwal at oracle.com> 
Sent: Thursday, November 8, 2018 12:17 AM
To: 'HYPERLINK "mailto:nio-dev at openjdk.java.net"nio-dev at openjdk.java.net' HYPERLINK "mailto:nio-dev at openjdk.java.net"<nio-dev at openjdk.java.net>
Subject: RFR: JDK-8197398 (zipfs) OutOfMemoryError when talking contents of empty JAR file
Hi all,
Please help review the changes for JDK-8199776 to JDK8u:-
Master Bug: https://bugs.openjdk.java.net/browse/JDK-8199776 
Webrev: http://cr.openjdk.java.net/~rpatil/8199776/webrev.00/
The Files.walkFileTree walk indefinitely while processing JAR file with "/" as a directory inside. 
Proposed fix:
Files.walkFileTree api for jar internally uses ZipfileSystem. While iterating over the zip entries we have added a check to see if entry name is equal to "/" (absolute path). If the entry name is equal to "/" we don't add it to "inodes" map so that we don't end up with infinite loop.
We have similar bug HYPERLINK HYPERLINK "https://bugs.openjdk.java.net/browse/JDK-8197398""https://bugs.openjdk.java.net/browse/JDK-8197398"JDK-8197398 fixed in jdk 12. Below is the difference between fix for jdk 12 and jdk 8:-
The fix for above issue for jdk 12 handle a case where we can update an existing entry in jar with "/" (absolute path).  As in case of jdk 8 we cannot update the existing zipentry as doing so we get "FileAlreadyExistsException". Therefore, fix for jdk 8u does not consider this case.

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