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Date: 08/29/2005
From: matt@newatlanta.com
Subject: Re: [ServletExec] JNI int[] references not being cleaned up by GC
When you say "the dir is otherwise empty" do you mean a directory on 

your hard-drive?
Does that directory reside inside your more full-blown webapp (a 
subdirectory within that webapp perhaps) ?
Or is it a directory that belongs to it's own, emtpy webapp, so that 
requests for that JSP are actually going to a bare-bones webapp that 
only contains 1 requestable item (the JSP), and does not contain any 
sort of Listeners, or Filters, etc...

Matt McGinty
Software Engineer
New Atlanta Communications, LLC
http://www.newatlanta.com 



Lazatin, Catherine J (GE Healthcare) wrote:

>Matt,
>
>	I used the snippet in its own JSP you sent and removed the other
>JSP so that the dir is otherwise empty and the memory still grows and is
>not being cleaned up after 30 minutes.
>
>	- Catherine 
>
>-----Original Message-----
>From: servletexec-interest-owner@mail.newatlanta.com
>[mailto:servletexec-interest-owner@mail.newatlanta.com] On Behalf Of
>matt@newatlanta.com
>Sent: Monday, August 29, 2005 1:19 PM
>To: servletexec-interest@mail.newatlanta.com
>Subject: Re: [ServletExec] JNI int[] references not being cleaned up by
>GC
>
>Catherine,
>I'm suggesting that you try using a JSP that looks like this:
>
><%@ page session = "false" %>
><html>
> <p>Hello</p>
></html>
>
>And have that JSP reside inside an otherwise empty webapp.
>This would just be for the purpose of learning whether or not the
>problem still occurs for you.
>
>If not, then the issue may very well have to do with sessions.
>If the problem occurs with that trivial of a test case, then I can try
>to reproduce the issue here using that trivial test case.
>
>Matt McGinty
>Software Engineer
>New Atlanta Communications, LLC
>http://www.newatlanta.com 
>
>
>
>Lazatin, Catherine J (GE Healthcare) wrote:
>
>  
>
>>We have set the session page attribute to true because we want the 
>>pages to share the current session.  The session needs to be maintained

>>    
>>
>
>  
>
>>across all requests because the application should only have one 
>>session per user - the session object stores user data that is used 
>>throughout the application.
>>
>>- Catherine
>>
>>-----Original Message-----
>>From: servletexec-interest-owner@mail.newatlanta.com
>>[mailto:servletexec-interest-owner@mail.newatlanta.com] On Behalf Of 
>>matt@newatlanta.com
>>Sent: Monday, August 29, 2005 11:34 AM
>>To: servletexec-interest@mail.newatlanta.com
>>Subject: Re: [ServletExec] JNI int[] references not being cleaned up by

>>    
>>
>
>  
>
>>GC
>>
>>Catherine,
>>What if you add the following line to the top of your JSP:
>>
>><%@ page session = "false" %>
>>
>>Do you still the problem occur?
>>
>>If so, then what if you unhook your Profiler and rerun the test?
>>Do you see OutOfMemoryError occuring then?
>>
>>How many requests per minute or per second does your script make?
>>Does it maintain the session across multiple requests, or does it cause

>>    
>>
>
>  
>
>>SE to create a brand new session on every single request?
>>
>>Matt McGinty
>>Software Engineer
>>New Atlanta Communications, LLC
>>http://www.newatlanta.com
>>
>>
>>
>>Lazatin, Catherine J (GE Healthcare) wrote:
>>
>> 
>>
>>    
>>
>>>	Our application doesn't use Xalan/Xerces or XSL               
transformations.
>>>I created a simple JSP (included below) and for every 10 accesses,  
the
>>>      
>>>
>
>  
>
>>>memory grows 1MB and doesn't get cleaned up even after 20      
minutes.  We
>>>      
>>>
>
>  
>
>>>have also run a similar test for a longer period of time (hours) in 

>>>which we ran a script that would access a HelloWorld type JSP.  The 

>>>server eventually crashed with out of memory errors.  The memory 
>>>profiler we are using indicates that there are int[] array objects 

>>>that
>>>   
>>>
>>>      
>>>
>> 
>>
>>    
>>
>>>are not being garbage collected because of JNI global references.
>>>
>>>	- Catherine
>>>
>>>-------------------------
>>><%
>>>int count = 0;
>>>Integer cnt=(Integer)session.getAttribute("count");
>>>
>>>if ( cnt == null) {
>>> session.setAttribute("count",new Integer(0)); } else {   
count = 
>>>cnt.intValue(); } %>
>>>
>>><HTML>
>>><BODY>
>>>
>>><% count++; %>
>>>
>>><H2> Count = <%=count%> </H2>
>>>
>>><%
>>>session.setAttribute("count", new Integer(count)); %>
>>>
>>></BODY>
>>></HTML>
>>>---------------------------------
>>>
>>>-----Original Message-----
>>>
>>>From: support@servletexec.com [mailto:support@servletexec.com 
>>><mailto:support@servletexec.com> ]
>>>
>>>Sent: Friday, August 26, 2005 3:05 PM
>>>
>>>To: Lazatin, Catherine J (GE Healthcare)
>>>
>>>Subject: Re: [Fwd: RE: [Fwd: ServletExec and JNI global             
references]]
>>>
>>>
>>>
>>>If you request a simple hello servlet or simple hello jsp (which 
>>>reside
>>>   
>>>
>>>      
>>>
>> 
>>
>>    
>>
>>>in their own separate, bare-bones webapp), do the int[] objects     
keep 
>>>growing and never go away?
>>>
>>>Or does that only occur when you send requests to your webapp?
>>>
>>>Matt McGinty
>>>
>>>Software Engineer
>>>
>>>New Atlanta Communications, LLC
>>>
>>>http://www.newatlanta.com <http://www.newatlanta.com/>
>>>
>>>
>>>________________________________
>>>
>>>From: servletexec-interest-owner@mail.newatlanta.com
>>>[mailto:servletexec-interest-owner@mail.newatlanta.com] On Behalf   
Of 
>>>Rick Bullotta
>>>Sent: Friday, August 26, 2005 7:32 AM
>>>To: servletexec-interest@mail.newatlanta.com
>>>Subject: RE: [ServletExec] JNI int[] references not being cleaned   
up 
>>>by GC
>>>
>>>
>>>
>>>Are any of your applications using Xalan/Xerces?  We have seen this 
in
>>>      
>>>
>
>  
>
>>>the past, particularly if you use the XPath or CachedXPath 
>>>capabilities of Xalan or when doing XSL transformations.
>>>
>>>
>>>
>>>________________________________
>>>
>>>From: servletexec-interest-owner@mail.newatlanta.com
>>>[mailto:servletexec-interest-owner@mail.newatlanta.com] On Behalf   
Of 
>>>Lazatin, Catherine J (GE Healthcare)
>>>Sent: Friday, August 26, 2005 7:38 AM
>>>To: servletexec-interest@mail.newatlanta.com
>>>Subject: [ServletExec] JNI int[] references not being cleaned up by 
GC
>>>
>>>
>>>
>>>
>>>
>>>  Hello.  We have been profiling memory usage and have been         
noticing 
>>>that JNI references are not being cleaned up in ServletExec even    
after
>>>45 min.  We are seeing a large growth 2-3MB of int[] arrays with    
each 
>>>request that goes through ServletExec.  (We are using IIS 5.1 and 
>>>ServletExec ISAPI 5.0.)  Has anyone else seen this issue?
>>>
>>>
>>>
>>>  - Catherine
>>>
>>>
>>>--------------------------------------------------------------------
--
>>>-
>>>   
>>>
>>>      
>>>
>>--
>> 
>>
>>    
>>
>>>ServletExec-Interest. For archives and unsubscribe instructions,
>>>      
>>>
>visit:
>  
>
>>>  http://www.newatlanta.com/servletexec-interest.jsp
>>>
>>>
>>>   
>>>
>>>      
>>>
>>-----------------------------------------------------------------------

>>-
>>-
>>ServletExec-Interest. For archives and unsubscribe instructions, visit:

>>
>>   http://www.newatlanta.com/servletexec-interest.jsp
>>
>>-----------------------------------------------------------------------

>>-- ServletExec-Interest. For archives and unsubscribe instructions, 
>>visit:
>>
>>   http://www.newatlanta.com/servletexec-interest.jsp
>> 
>>
>>    
>>
>
>------------------------------------------------------------------------
>-
>ServletExec-Interest. For archives and unsubscribe instructions, visit:
>
>    http://www.newatlanta.com/servletexec-interest.jsp
>
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>  
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Message Thread
Date Subject Author
08/26/2005 RE: [ServletExec] JNI int[] references not being cleaned up by GC Rick.Bullotta@lighthammer.com
08/26/2005 RE: [ServletExec] JNI int[] references not being cleaned up by GC Catherine.Lazatin@ge.com
08/29/2005 Re: [ServletExec] JNI int[] references not being cleaned up by GC matt@newatlanta.com
08/29/2005 RE: [ServletExec] JNI int[] references not being cleaned up by GC Catherine.Lazatin@ge.com
08/29/2005 Re: [ServletExec] JNI int[] references not being cleaned up by GC matt@newatlanta.com
08/29/2005 RE: [ServletExec] JNI int[] references not being cleaned up by GC Catherine.Lazatin@ge.com
08/29/2005 Re: [ServletExec] JNI int[] references not being cleaned up by GC matt@newatlanta.com
08/29/2005 RE: [ServletExec] JNI int[] references not being cleaned up by GC Catherine.Lazatin@ge.com
09/08/2005 Re: [ServletExec] JNI int[] references not being cleaned up by GC matt@newatlanta.com
08/26/2005 [ServletExec] JNI int[] references not being cleaned up by GC Catherine.Lazatin@ge.com
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