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Java heap space out of memory error [message #334271]

Fri, 30 January 2009 07:46

Sharon F

Messages: 8
Registered: July 2009

Junior Member

Hi All,
I have a plugin handling data for a specific type of files. The plugin
loads data from a file into a data module, then creates a multipage editor
to display and edit the data module, and finally writes data back to the
file.
The data module is created thru a factory class's getInstance(File
editingFile) static method, which enables the plugin to edit mulitiple
files at the same time. Inside the factory class, a static HashMap is used
to keep track of each java.io.File object and its corresponding data
module.
The plugin works just fine until when tests it with a fairly big file:
open the big file and then close it immediately for several times, a java
heap space out of memory error occurs.
With Java VisualVM, I found the plugin keeps about 8M heap memory
unreleased after being closed. I tried every way to solve it but could
not: it seems to me that all the widgets have been disposed, the data
module has been removed from the factory class.
Any ideas? Or is there any tool can help me to find who stays in the heap
not cleaned up?

Thanks in advance!

Sharon
--
http://www.eclaxy.com

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Re: Java heap space out of memory error [message #334272 is a reply to message #334271]

Fri, 30 January 2009 08:21

Jens übler

Messages: 17
Registered: July 2009

Junior Member

Sharon schrieb:
> Hi All,
> I have a plugin handling data for a specific type of files. The
> plugin loads data from a file into a data module, then creates a
> multipage editor to display and edit the data module, and finally writes
> data back to the file. The data module is created thru a factory
> class's getInstance(File editingFile) static method, which enables the
> plugin to edit mulitiple files at the same time. Inside the factory
> class, a static HashMap is used to keep track of each java.io.File
> object and its corresponding data module.
> The plugin works just fine until when tests it with a fairly big
> file: open the big file and then close it immediately for several times,
> a java heap space out of memory error occurs.
> With Java VisualVM, I found the plugin keeps about 8M heap memory
> unreleased after being closed. I tried every way to solve it but could
> not: it seems to me that all the widgets have been disposed, the data
> module has been removed from the factory class.
> Any ideas? Or is there any tool can help me to find who stays in the
> heap not cleaned up?
>
> Thanks in advance!
>
> Sharon
> --
> http://www.eclaxy.com
>
>

Try to profile your project by using Eclipse TPTP or use JProfiler.
These tools offer memory analysis so you can pin down what exactly stays
in memory.

Jens

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Re: Java heap space out of memory error [message #334289 is a reply to message #334271]

Fri, 30 January 2009 21:46

Walter Harley

Messages: 847
Registered: July 2009

Senior Member

"Sharon" <sharon.floyd@eclaxy.com> wrote in message
news:d9fd030cf8e55a74e7d14bbdca55cba5$1@www.eclipse.org...
> The data module is created thru a factory class's getInstance(File
> editingFile) static method, which enables the plugin to edit mulitiple
> files at the same time. Inside the factory class, a static HashMap is used
> to keep track of each java.io.File object and its corresponding data
> module.

Just to check: you are removing the entry from that map, when the file is
closed, right?

I've found that whenever using these sort of static maps that track dynamic
data it is very important to think about the references. Sometimes it helps
to have it be a Map<File, WeakReference<Thing>> rather than just a Map<File,
Thing>, so that there isn't a circular reference that prevents the Thing
from ever actually being released.

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