Memory Leak on Applet Refresh in IE

Hi All,
This is really strange, if you have launched an java applet in IE and hit refresh, the the memory consumed by IE increses.Ideally speaking the consumed memory in task manager by IE with applet should show same if you hit refresh.But it grows.There is a memory leak.
There was a bug [http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4894522] filed and claims to be fixed in 1.4..well i dont see it fixed in 1.6 either.
Any thoughts..??
Ex: First launch 45MB is being by applet ..hit refresh it goes to 80MB...and this goes untill a point and the incrementation of memory consumed becomes smaller and control becomes very slow.
Thanks,
Ranjitha

More likely a bug in your applet. Not that there's not bugs, but more often than not, the fault is yours, not Java's.
That's a whole lot of memory usage. That suggests that you are loading up a bunch of stuff, then holding onto it in the applet reference, maybe some static fields, then creating a whole new set of objects the second time.
Static fields are not discarded, nor are classes unloaded (or technically because classes are not unloaded), when the browser is refreshed. So if you don't dispose of things, they may linger.
Of course, resetting a static field should make the old objects go out of scope and eligible for GC.
So maybe some explanation of what you're doing in your applet would go a long way towards figuring it out.

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+...+
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Try this url:
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Hi,
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Open task manager to view the Memory Usage.
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Edited by: Alistair Laing on Jun 16, 2012 2:32 PM
Added Tags

Alistair Laing wrote:
Hi,
We busy upgrading our apex and db from 3.0/10G to 4.1.1/11.2G and notice that there appears to be a memory leak when using APEX. At one stage we have had IE7 using over a gig of memory.
When you load or refresh your page IE7 seems to grab on average 2-5MB of memory for each page load. At first we thought it may have been our apps or setup but this also happens when we go to app 4550 page 1 on apex.oracle.com.
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Open task manager to view the Memory Usage.
Using IE7
1. Go to http://apex.oracle.com/pls/apex/f?p=4550:1
2. Go back to Task Manager and note the readings once the CPU Usage for iexplore.exe has stablised to 0.
3. go back to IE7 and press F5
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We think this maybe due to a few jQuery UI memory leaks within IE7 and thought this bug ticket maybe of interest http://bugs.jqueryui.com/ticket/7666 (Slightly different versions but similiar experiences)
Could someone else confirm that they also experience the increasing or have had similiar problems and managed to resolve it?Anecdotally, yes. Don't have exact steps for replication or precise numbers, but I have noticed this in passing. On the junk that my client considers a PC suitable for web development the typical IE7 memory footprint with the APEX 3.0 builder and several other tabs running is about 52MB. Add APEX 4.1.1 and it climbs constantly until I have to pull the plug when it gets north of 150MB as the PC can't take it.
As well that I also have Firefox and 4.1.1 is still experimental at that site...
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VC wrote:
Look at this http://www.bbc.co.uk/news/technology-18440979
Alistair Laing wrote:lol @ VC - I dont shop online at work :-D
I saw that eariler this week. I do agree with the concept though.So take appropriate action: charge extra for IE7 support.
The amount of work and effort involved in making our website look normal on IE7 equalled the combined time of designing for Chrome, Safari and Firefox.Is entirely accurate. If it's stated as a requirement, itemise it as an extra on the quote.
Educate management and bean counters: show them the one line of standards-compliant CSS that's all that is necessary in Safari, Chrome, Firefox and Opera (and just possibly in IE8/9/10), how it isn't supported in IE7, and the tortuous hacks and workarounds that are required to get something equivalent working there.

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Hi all....
I have noticed a memory leak in my application. This leak was
not apparent when the application was completed some months back
which is what left me a little confused as all I have done since
was upgrade to Flex 3 and possibly updated / changed my Flash
player.
I think I have found the cause to this problem (below) but am
not 100% sure that it is the "actual" problem or any reasons to
back my thoughts up, so have listed what I have checked / tried
along the way (maybe I have missed something)....
My Discovery Process:
I started profiling my application but did not find anything
out of the ordinary. I did a code walk-through double checking I
had cleaned up after myself, removing and even nulling all items
etc but still to now success - the leak is still there.
I have profiled the app in the profiler for reasonably long
periods of time.
All the classes etc being used within the app are consistent
in size and instance amount and there is no sign of any apparent
leak.
I am using a HTTPService that is loading XML data which I am
refreshing every 5 seconds. On this 5 second data refresh some
class instances are incremented but are restored to the expected
amount after a GC has occurred. The GC seems to take longer, the
longer the app is running, therefore more and more instances are
being added to the app, but when the GC eventually runs it "seems"
to clear these instances to the expected amount.
After scratching my head for a while I decided to make a copy
of my application, rip everything out, and focus in my data load,
where I found a problem!
I have now just a HTTPService that loads an XML file every 5
seconds, and this is all I currently have in the app (as I ripped
the rest of the code out), e.g:
Code:
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
....... creationComplete="initApp()" >
<mx:HTTPService
id="httpServiceResults"
url="
http://myIP:myPort/myRoot/myXML.cfm"
resultFormat="e4x"
result="httpResultHandler(event)" />
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httpServiceResults.send();
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</mx:Application>
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I ran and monitored this in both the profiler and the
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just sending the HTTPService.
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I then tried to load the XML using different methods such as
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leak.
What still confuses me is that this leak did not exist in the
previous version and not a great deal has changed since then apart
from upgrading to Flex 3 and possibly upgrading my Flash payer
(which I believe is a possible cause)
After looking into this issue a bit more deeply, I read a few
blogs / forums and other people are experiencing the same problems
- even with a lot bigger leaks in some cases all when reloading
large sets of XML data into Flex - however, I as of yet found no
solution to this leak - people with a similar problem believe it is
not due to a memory leak more a GC error, and others pointing
towards the Flash Player itself that is leaking - I don't really
know.
Findings so far during investigation of this issue:
* App leaks for both HTTPService and ULRRequest / URLLoader
methods
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* The size of the leak seems to depend on the size of the
XML being loaded
* The size of the leak also seems to be affected by the
applications heaviness - the greater seems to enhance the leak
An interesting factor I have noticed is that if I copy the
XML from my "myXML.cfm" that I link to in my HTTPService and copy
the contents of the file into my own XML file stored within the
Flex project root itself: ""myXML.xml"" the leak disappears... like
it seems to link when loading the XML over a network, however as my
network knowledge is not great I am not sure what to make of this -
any ideas???
Could the connection to the XML document cause leaks??? is
there anything else that could cause this leak??? have I something
in my code sample that could cause this leak??? or could any of the
other things I have mentioed cause this leak???
Any help / ideas would be greatly appreciated.
Thanks,
Jon.

I also observed heavy memory leak from using httpservice with
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Generally I have 1 - 5 tabs open in IE at any given time. Usually one of them is a tab for Yahoo Mail. Other tabs are related to whatever I may be searching for or doing at that time, so pretty varied. Throughout the day at random times I will begin to get a grey icon for anywhere on some tabs where there is supposed to be a flash video (like the ad in the right side of the Yahoo Mail tab)... When it happens I can open Task Manager in windows and I notice that 1 or two "iexplore.exe *32" processes have memory consumed in excess of 600,000K. When I end those processes I am again able to see any flash videos that need to be viewed.
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Whenever you refresh/reload a tab, the browser should signal to us that our process is being destroyed, at which point we would release all of our resources and shut down. SergeStone's comment above makes it sound like this might not be happening in a particular case. I'm going to build out a few tests this week to explore this in more detail, and I'll follow up with results.
Also, it's worth discussing the difference between memory consumption and memory leaks. Flash Player is designed to consume a percentage of your available memory. If you have a 32-bit machine with 2GB of RAM, we're going to consume a lot less memory than a 64-bit system with 16GB of RAM.
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Here's a link to the latest Beta download:
http://labs.adobe.com/downloads/flashplayer11-5.html
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For those of you using Performance Monitor and other tools to measure, you can directly observe the resources used by Flash Player
For the folks concerned about Bookmarks synchronization, both Firefox and Chrome provide native bookmark syncing and import from IE mechanisms.
Xmarks is a really nice, free utility that provides cross-browser, cross-platform bookmark synchronization.
Thanks,
Jeromie Clark

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