[jira] [Resolved] (HTTPCORE-513) ExpandableBuffer breaks on large response

["Oleg Kalnichevski (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HTTPCORE-513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Oleg Kalnichevski resolved HTTPCORE-513.
----------------------------------------
       Resolution: Fixed
    Fix Version/s: 4.4.10

Fixed in 4.4.x and master.

Oleg

> ExpandableBuffer breaks on large response
> -----------------------------------------
>
>                 Key: HTTPCORE-513
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-513
>             Project: HttpComponents HttpCore
>          Issue Type: Bug
>          Components: HttpCore, HttpCore NIO
>    Affects Versions: 4.4.9
>            Reporter: Ion Moldovan
>            Priority: Critical
>             Fix For: 4.4.10, 5.0
>
>
> Steps:
>  # create a PHP page with the following content: 
>  ## <?php
>  $response='abc';
>  echo str_pad($response, 2147483647);
>  # send a request using jMeter to the said page
> Expected result: the request is received
> Actual result: the VM fails with:
> java.lang.OutOfMemoryError: Requested array size exceeds VM limit
>  Dumping heap to java_pid20344.hprof ...
>  Heap dump file created [3275879706 bytes in 7.490 secs]
>  Uncaught Exception java.lang.OutOfMemoryError: Requested array size exceeds VM limit. See log file for details.
>  
> Proposed solution:
>  * rewrite org.apache.http.nio.util.ExpandableBuffer.expand() to:
>  
> {code:java}
> /**
> * Expands buffer's capacity.
> */
> protected void expand() {
>   int newcapacity = (this.buffer.capacity() + 1) << 1;
>   if (newcapacity < 0) {
>     int headRoom = Integer.max(Long.BYTES, 8);
>     // Reason: In GC the size of objects is passed as int (2 bytes). 
>     // Then, the header size of the objects is added to the size. 
>     // Long has the longest header available. Object header seems to be linked to it. 
>     // Details: I added a minimum of 8 just to be safe and because 8 is used in 
>     // java.lang.Object.ArrayList: private static final int MAX_ARRAY_SIZE = 2147483639.
>     newcapacity = Integer.MAX_VALUE - headRoom; 
>   } 
>   expandCapacity(newcapacity); 
> }{code}
>  



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