Interesting. I tried it and I see only one open jar file on Solaris 10.
I wonder what it is about the other platforms that's causing it to open
the file more than once?
Are you going to file a JDK bug? If so, let us know.
Richard S. Hall wrote on 10/13/09 3:44 AM:
> Well, here is the test program I wrote:
>
> package test;
> import java.util.jar.JarFile;
> public class Main {
> public static void main(String[] args) throws Exception {
> JarFile jar = new JarFile("test.jar");
> System.out.println("+++ AFTER");
> Thread.sleep(120000);
> }
> }
>
> Under Windows test.jar appears to be opened twice using handle.exe:
>
> java.exe pid: 3992 HEAVYWEIGHT-XP\rickhall
> 694: File (RW-) C:\Documents and
> Settings\rickhall\Projects\tmp\test.jar
> 698: File (RW-) C:\Documents and
> Settings\rickhall\Projects\tmp\test.jar
>
> Under Snow Leopard test.jar appears to be opened twice using lsof:
>
> java 27559 rickhall 30r REG 14,2 938 35110250
> /Users/rickhall/tmp/test.jar
> java 27559 rickhall 31r REG 14,2 938 35110250
> /Users/rickhall/tmp/test.jar
>
> Under Linux test.jar appears to be opened twice using lsof:
>
> java 2527 rickhall 4r REG 253,0 949 508106
> /home/rickhall/test.jar
> java 2527 rickhall 5r REG 253,0 949 508106
> /home/rickhall/test.jar
>
> So, it doesn't appear to be specific to the Mac. Part of me wonders if
> this is just some confusion in how these utilities report open file...
>
> I actually tried to test it on OpenSolaris too. That was a little more
> complicated and I don't know if I was successful or not, but in that
> case it seems like I only saw one open file.
>
> -> richard
>
> On 10/13/09 0:19, Richard S. Hall wrote:
>> Ok, before reporting this, I will check on a couple other platforms
>> (e.g., Linux and Windows) to make sure it isn't Mac OS specific.
>>
>> -> richard
>>
>> On 10/12/09 23:42, Jeanfrancois Arcand wrote:
>>>
>>>
>>> Bill Shannon wrote:
>>>> Richard S. Hall wrote on 10/11/09 4:41 AM:
>>>>> I set a break point where Felix opens the the first bundle JAR file
>>>>> using JarFile. Before creating the JarFile there was no open bundle
>>>>> JAR
>>>>> files, after it there were two. I even created a simple test program
>>>>> that only opens a JarFile in its main method and sleeps for 30
>>>>> seconds.
>>>>> This is what I saw:
>>>>>
>>>>> java 14129 rickhall 30r REG 14,2 846 43270278
>>>>> /Users/rickhall/tmp/jar/jar.jar
>>>>> java 14129 rickhall 31r REG 14,2 846 43270278
>>>>> /Users/rickhall/tmp/jar/jar.jar
>>>>>
>>>>> So, it seems JarFile always reports two open files. Not sure why.
>>>>
>>>> So, I guess it's a bug, or feature, of the JDK.
>>>>
>>>> Maybe you should file a bug and see what they say? You might want
>>>> to search the bug database first.
>>>
>>> FYI I've talked with the SE team and it seems it is not a known issue
>>> (at least based on this email thread). In any case we should document
>>> the fact that GF needs more than the usual default fd to runs
>>> properly, because we will ends up with tons of post on 'GlassFish
>>> leaks fd' :-)
>>>
>>> -- Jeanfrancois
>>>
>>>
>>>>
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