Re: java.lang.OutOfMemoryError

[Joe Carter <jo...@excite.com>]

For the latest versions of 1.4.2 (_10 and up) and 5/6 there is a very
useful utility called jmap -
http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jmap.html
that's built into the Java SDK. This dumps out all the objects in the heap.
Doesn't work under windows though..

Joe

On 30/12/06, Thomas Fischer <tf...@apache.org> wrote:
>
> An out of memory error is typically very difficult to pinpoint. The place
> where this error occurs is typically not connected to the place where the
> problem sits. Personally, I know of two ways of dealing with this
> - you can have an idea what happens. The answers before have provided
> situations where OutOfMemory-Problems typically happen.
> - If you think that none of the typical causes apply to you, you have to
> find out the hard way. To get an idea of the cause of the problem, create
> a heap dump of the virtual machine just after an OutOfMemory-Error occured
> (on linux, this is done by using the "kill -3" command on the appropriate
> process). Then, scan through the heap dump to see which objects occur most
> often. These are usually the objects which are not dereferenced and cause
> the memory overflow. Then go through the code and find out where these
> objects are created, and why they are not thrown away after being used.
> You might need more information out of the heap dump than just the class
> names of the relevant object; there are tools showing the refences out of
> heap dumps but I never used one myself.
>
>     Hope this helps,
>
>           Thomas
>
> On Mon, 18 Dec 2006, jill han wrote:
>
> > What could cause java.lang.OutOfMemoryError ?
> > The application is built on turbine/torque/velocity.
> >
> > Thanks in advance
> >
> > Jill
> >
> >
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