Re: Out of memory
Re: Out of memory
- Subject: Re: Out of memory
- From: Chuck Hill <email@hidden>
- Date: Thu, 28 Jun 2007 08:26:02 -0700
On Jun 28, 2007, at 1:54 AM, Muckenhirn, Ralf wrote:
Hello,
I know there were some big discussions about that problem before.
But I have not found any solution for my problem until now.
I’ve created a small and very simple web-service using WebObjects
to reproduce my problem (see below). I then calling this web-
service from a small application by invoking with axis every 200ms.
When looking to the used memory of my web-service it will grow
continuously over the time. After a while (maybe 30 min to 1h) I
get a java.lang.OutOfMemory: Heap overflow error.
I’ve tried a lot of things like revert, invalidateAllObjects,
dispose (where I get a java.lang.IllegalStateException).
Also increasing the max heap size for the JVM does not help. The
error appears only later.
I’ve used JProfiler to profile the web-service and found the most
(also increasing) memory usage in editingContext
()._initWithParentObjectStore().
I’ve tried this example on a WindowsXP with WebObjects 5.2.4 as
well on a Apple XServe with WebObjects 5.3.
Some bad things are happening:
public class MyService implements IMyService {
public void storeToDB(String text1, String text2, String
text3, String text4, String text5) {
WOSession session =
WOWebServiceUtilities.currentWOContext().session();
EOEditingContext ec = session.defaultEditingContext();
Why create a session? If you have not changed the defaults, this
session, and its editing context and the objects you create etc. etc
are going to live in your app for the next _hour_. Of course memory
usage continually increases!
//ec.setUndoManager(null);
ec.undoManager().disableUndoRegistration();
MyLog myLog = new MyLog();
myLog.setCol1(text1);
myLog.setCol2(text2);
myLog.setCol3(text3);
myLog.setCol4(text4);
myLog.setCol5(text5);
ec.insertObject(myLog);
You are violating EOF commandments. See http://en.wikibooks.org/wiki/
Programming:WebObjects/EOF/Using_EOF/The_EOF_Commandments
ec.saveChanges();
}
}
Any ideas?
Yes. This code should be:
public void storeToDB(String text1, String text2, String text3,
String text4, String text5) {
EOEditingContext ec = new EOEditingContext();
ec.lock();
try {
MyLog myLog = new MyLog();
ec.insertObject(myLog);
myLog.setCol1(text1);
myLog.setCol2(text2);
myLog.setCol3(text3);
myLog.setCol4(text4);
myLog.setCol5(text5);
ec.saveChanges();
finally {
ec.unlock();
ec.dispose();
}
}
Chuck
--
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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| References: | |
| | >Out of memory (From: "Muckenhirn, Ralf" <email@hidden>) |