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From "Vasily Zakharov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-3703) [classlib][archive][netbeans] GZIPInputStream throws IOException when feeding from the network
Date Thu, 26 Apr 2007 11:16:15 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-3703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12491967
] 

Vasily Zakharov commented on HARMONY-3703:
------------------------------------------

Great to hear that, thanks Mkhail!

Just for completeness, here's the statistics for DRL VM, also on 1000 runs:

SUCCESS
(293 times)

java.lang.ArrayIndexOutOfBoundsException: bad arrayCopy
        at java.lang.VMMemoryManager.arrayCopy(VMMemoryManager.java)
        at java.lang.System.arraycopy(System.java:86)
        at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:164)
        at Test.main(Test.java:13)
(242 times, size is negative)

java.io.EOFException
        at java.util.zip.GZIPInputStream.readFully(GZIPInputStream.java:196)
        at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:168)
        at Test.main(Test.java:13)
(455 times, size is 0, 1 or 2)

java.io.IOException: Crc mismatch
        at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:170)
        at Test.main(Test.java:13)
(10 times, size is 8)

Clearly, the problem is not VM-dependent, though some timing or synchronization issue is in
place, so the relative amount of different types of failures is different.

I'm sure size variable value governs the particular failure outcome, but what affects that
value it still unclear for me - it's different each time, on exactly the same data. Probably
the speed or timing of data incoming from the network is the factor.


> [classlib][archive][netbeans] GZIPInputStream throws IOException when feeding from the
network
> ----------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-3703
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3703
>             Project: Harmony
>          Issue Type: Bug
>          Components: App-Oriented Bug Reports, Classlib
>            Reporter: Vasily Zakharov
>
> When java.util.zip.GZIPInputStream is passed a stream constructed from a network URL,
it throws IOException (Crc mismatch) at end-of-stream. If the same content is fed through
local file URL, the problem doesn't occur. It looks like some end-of-stream detection problem
is in place, or a race condition.
> public class Test {
>     public static void main(String args[]) throws Exception {
>         byte[] buffer = new byte[0x100000];
>         String url =
>                 "http://www.netbeans.org/updates/55_1.20_.xml.gz";
>                 //"file:55_1.20_.xml.gz";
>         java.io.InputStream stream = new java.util.zip.GZIPInputStream(new java.net.URL(url).openStream());
>         int length = 0, num = 0;
>         while (num >= 0) {
>             length += num;
>             System.out.println(length);
>             num = stream.read(buffer, length, (buffer.length - length));
>         }
>     }
> }
> $ Ri/bin/java -Dhttp.proxyHost=$PROXY_HOST -Dhttp.proxyPort=$PROXY_PORT Test
> 0
> 777
> 3392
> ...
> 386431
> SUCCESS
> $ HY/bin/java -Dhttp.proxyHost=$PROXY_HOST -Dhttp.proxyPort=$PROXY_PORT Test
> 0
> 777
> 3392
> ...
> 386431
> Exception in thread "main" java.io.IOException: Crc mismatch
>         at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:166)
>         at Test.main(Test.java:13)
> On IBM VM, this result is stable. On DRLVM, the test sometimes (rarely) passes, and sometimes
(also rarely) another exception occurs instead of IOException:
> Uncaught exception in main:
> java.lang.ArrayIndexOutOfBoundsException: bad arrayCopy
>         at java.lang.VMMemoryManager.arrayCopy(VMMemoryManager.java)
>         at java.lang.System.arraycopy(System.java:86)
>         at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:161)
>         at Test.main(Test.java:13)
> If content is previously downloaded (wget http://www.netbeans.org/updates/55_1.20_.xml.gz)
and local file URL is used instead of network URL (comment line 5, uncomment line 6), output
on Harmony becomes identical to output on RI.
> This problem was discovered while trying to run NetBeans on Harmony. 
> Issue HARMONY-3702 was also filed while investigating this one.

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