OutOfMemoryError, setSrc(null)

asked 2007-05-28 15:16:53 +0800

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By: fedd

OutOfMemoryError, setSrc(null)

hi,

it seems to me that when i detach a page by setSrc method in the include element, the page stays somewhere in memory and doesnt get collected. the included zul page has a reference to the desktop and the desktop has multiple reference to my objects, so they are not collected as well.

or - when a page was included programmatically by setSrc() and then the session outdates - the desktop is not gc-ed.

anyway, at the end i get OutOfMemoryError.

nowhere in my code i have references to any of zk object, except in the codes which extend Window and other elements.

please give a hint could it be so and what should i do...

fedd

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answered 2007-05-29 03:04:54 +0800

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By: jumperchen

Could you provide some example about your issue?

Thanks,
Jumper

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answered 2007-05-29 07:42:03 +0800

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By: fedd

it's very difficult because the application has grown very big; can't provide a purified example.

but i wrote a little program that walks on references of loaded objects; here are all the references it found to desktops. note that the DesktopImpl(id=3306) is not used for nore than 10 minutes (desktop timeout is set to 2 mins, session timeout - 2 minutes). see, there are only references from pages and PageImpl$NS objects, no references to desktops from my objects!

org.zkoss.zk.ui.impl.DesktopImpl: 2 insts
---- inst: instance of org.zkoss.zk.ui.impl.DesktopImpl(id=3306): 32 refs
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3616)---- name:
"call_zul"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3617)---- name:
"historyActionsListPage"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3618)---- name:
"dcaselistpage"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3619)---- name:
"z__p0"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3620)---- name:
"resultListPage"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3621)---- name:
"dataset_zul"
---- ---- ref: instance of java.util.HashMap$Entry(id=3622)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3503) thru:
instance of java.util.HashMap$Entry[16] (id=3501)-instance of
java.util.HashMap(id=3502)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3623)---- name:
"menuPage"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3624)---- name:
"z__p1"
---- ---- ref: instance of java.util.HashMap$Entry(id=3625)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3511) thru:
instance of java.util.HashMap$Entry[16] (id=3509)-instance of
java.util.HashMap(id=3510)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3626)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3514) thru:
instance of java.util.HashMap$Entry[16] (id=3512)-instance of
java.util.HashMap(id=3513)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3627)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3517) thru:
instance of java.util.HashMap$Entry[16] (id=3515)-instance of
java.util.HashMap(id=3516)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3628)---- name:
"plannedActionsListPage"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3629)---- name:
"z__p4"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3630)---- name:
"promise_zul"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3631)---- name:
"main"
---- ---- ref: instance of java.util.HashMap$Entry(id=3632)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3538) thru:
instance of java.util.HashMap$Entry[16] (id=3536)-instance of
java.util.HashMap(id=3537)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3633)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3520) thru:
instance of java.util.HashMap$Entry[16] (id=3518)-instance of
java.util.HashMap(id=3519)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3634)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3523) thru:
instance of java.util.HashMap$Entry[16] (id=3521)-instance of
java.util.HashMap(id=3522)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3635)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3526) thru:
instance of java.util.HashMap$Entry[16] (id=3524)-instance of
java.util.HashMap(id=3525)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3636)---- name:
"z__p2"
---- ---- ref: instance of java.util.HashMap$Entry(id=3637)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3542) thru:
instance of java.util.HashMap$Entry[32] (id=3540)-instance of
java.util.HashMap(id=3541)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3638)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3529) thru:
instance of java.util.HashMap$Entry[16] (id=3527)-instance of
java.util.HashMap(id=3528)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3639)---- name:
"z__p3"
---- ---- ref: instance of java.util.HashMap$Entry(id=3640)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3500) thru:
instance of java.util.HashMap$Entry(id=3662)-instance of java.util.HashMap$Entry[16] (id=3498)-instance of java.util.HashMap(id=3499)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3641)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3545) thru:
instance of java.util.HashMap$Entry[16] (id=3543)-instance of
java.util.HashMap(id=3544)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3642)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3548) thru:
instance of java.util.HashMap$Entry[16] (id=3546)-instance of
java.util.HashMap(id=3547)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3643)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3534) thru:
instance of java.util.HashMap$Entry[32] (id=3531)-instance of
java.util.HashMap(id=3532)-
---- ---- ---- in: instance of java.util.HashMap$KeySet(id=3533) thru: instance of java.util.HashMap$Entry[32] (id=3531)-instance of java.util.HashMap(id=3532)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3644)---- name:
"dcasepage"
---- ---- ref: instance of java.util.HashMap$Entry(id=3645)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3507) thru:
instance of java.util.HashMap$Entry[32] (id=3505)-instance of
java.util.HashMap(id=3506)-
---- ---- ---- in: instance of java.util.HashMap$KeySet(id=3508) thru: instance of java.util.HashMap$Entry[32] (id=3505)-instance of java.util.HashMap(id=3506)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3646)---- name:
"loginPage"
---- ---- ref: instance of java.util.HashMap$Entry(id=3647)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3551) thru:
instance of java.util.HashMap$Entry[16] (id=3549)-instance of
java.util.HashMap(id=3550)-
---- inst: instance of org.zkoss.zk.ui.impl.DesktopImpl(id=3556): 30 refs
---- ---- ref: instance of java.util.HashMap$Entry(id=3665)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3582) thru:
instance of java.util.HashMap$Entry(id=3695)-instance of java.util.HashMap$Entry[16] (id=3580)-instance of java.util.HashMap(id=3581)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3666)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3572) thru:
instance of java.util.HashMap$Entry[32] (id=3570)-instance of
java.util.HashMap(id=3571)-
---- ---- ---- in: instance of java.util.HashMap$KeySet(id=3573) thru: instance of java.util.HashMap$Entry[32] (id=3570)-instance of java.util.HashMap(id=3571)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3667)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.UiEngineImpl(id=3698) thru:
instance of java.util.HashMap$Entry[16] (id=3696)-instance of
java.util.HashMap(id=3697)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3668)---- name:
"z__ps1"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3669)---- name:
"z__pu1"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3670)---- name:
"historyActionsListPage"
---- ---- ref: instance of java.util.HashMap$Entry(id=3671)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3576) thru:
instance of java.util.HashMap$Entry[16] (id=3574)-instance of
java.util.HashMap(id=3575)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3672)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3579) thru:
instance of java.util.HashMap$Entry[16] (id=3577)-instance of
java.util.HashMap(id=3578)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3673)---- name:
"dcasepage"
---- ---- ref: instance of java.util.HashMap$Entry(id=3674)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3615) thru:
instance of java.util.HashMap$Entry(id=3701)-instance of java.util.HashMap$Entry[16] (id=3613)-instance of java.util.HashMap(id=3614)-
---- ---- ref: instance of org.zkoss.util.CacheMap$Value(id=3675)
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3676)---- name:
"main"
---- ---- ref: instance of java.util.HashMap$Entry(id=3677)
---- ---- ---- in: instance of java.util.HashMap$KeySet(id=3586) thru: instance of java.util.HashMap$Entry[32] (id=3584)-instance of java.util.HashMap(id=3585)-
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3587) thru:
instance of java.util.HashMap$Entry[32] (id=3584)-instance of
java.util.HashMap(id=3585)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3678)---- name:
"searchBoxPage"
---- ---- ref: instance of java.util.HashMap$Entry(id=3679)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3590) thru:
instance of java.util.HashMap$Entry[16] (id=3588)-instance of
java.util.HashMap(id=3589)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3680)---- name:
"plannedActionsListPage"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3681)---- name:
"foundListPage"
---- ---- ref: instance of java.util.HashMap$Entry(id=3682)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3593) thru:
instance of java.util.HashMap$Entry[16] (id=3591)-instance of
java.util.HashMap(id=3592)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3683)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3596) thru:
instance of java.util.HashMap$Entry[16] (id=3594)-instance of
java.util.HashMap(id=3595)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3684)---- name:
"z__pv1"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3685)---- name:
"z__p02"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3686)---- name:
"menuPage"
---- ---- ref: instance of java.util.HashMap$Entry(id=3687)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3599) thru:
instance of java.util.HashMap$Entry[16] (id=3597)-instance of
java.util.HashMap(id=3598)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3688)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3602) thru:
instance of java.util.HashMap$Entry[16] (id=3600)-instance of
java.util.HashMap(id=3601)-
---- ---- ref: instance of java.util.HashMap$Entry(id=3689)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3606) thru:
instance of java.util.HashMap$Entry[16] (id=3604)-instance of
java.util.HashMap(id=3605)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3690)---- name:
"promise_zul"
---- ---- ref: instance of java.util.HashMap$Entry(id=3691)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3609) thru:
instance of java.util.HashMap$Entry[16] (id=3607)-instance of
java.util.HashMap(id=3608)-
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3692)---- name:
"z__pt1"
---- ---- ref: instance of org.zkoss.zk.ui.impl.PageImpl(id=3693)---- name:
"resultListPage"
---- ---- ref: instance of java.util.HashMap$Entry(id=3694)
---- ---- ---- in: instance of org.zkoss.zk.ui.impl.PageImpl$NS(id=3612) thru:
instance of java.util.HashMap$Entry[16] (id=3610)-instance of
java.util.HashMap(id=3611)-

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answered 2007-05-29 10:00:48 +0800

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By: jumperchen

Could you provide your a little program that it can test for us?

Thanks a lot,
Jumper

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answered 2007-05-29 11:20:53 +0800

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Orignial message at:
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By: fedd

Jumper,

yes, for example, try these three little pages

leaktestMain.zul

<?xml version="1.0" encoding="windows-1251"?> <?page id="leakTestPage" title="Leak Test"?>

<window id="leakTestWindow">

<button label="Switch includes"
onClick="if(includePlace.getSrc().equals("leaktest1.zul"))
includePlace.setSrc("leaktest2.zul"); else includePlace.setSrc("leaktest1.zul"); "/>

<include id="includePlace" src="leaktest1.zul"/>

</window>

leaktest1.zul

<?xml version="1.0" encoding="windows-1251"?> <?page id="leakTest1" title="Leak Test Include"?>

<window id="leakTestInclude">

<hbox forEach="${desktopScope.stringArray}">${each}</hbox>

<button if="${empty desktopScope.stringArray}" label="Populate Array"
onClick="desktopScope.put("stringArray", new String[]{"one", "two", "three"})"/>

</window>

leaktest2.zul

<?xml version="1.0" encoding="windows-1251"?> <?page id="leakTest2" title="Leak Test Include 2"?>

<window id="leakTestInclude">

Here is nothing

</window>

set the desktop and session timeout for 2 minutes

go to leaktestMain.zul, press the button "Switch includes" several times, then populate the array by the button on the first include, then switch includes again.

open in several browser windows; close them in any order.

i have one desktop implementation instance living in memory forever together with the array that was filled by "Populate array" button.

i think that the array and desktop stay in memory when you close the browser while "leaktest2.zul" is included.

fedd

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answered 2007-05-29 13:13:23 +0800

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By: gback

Did you try using jmat/jhat?
See http://sourceforge.net/forum/message.php?msg_id=4279633

Does this happen during development when you reload changed classes, or do you have context reloadable turned off in your Tomcat settings?

Beanshell is known to cache defined classes, see
http://sourceforge.net/forum/message.php?msg_id=3869487

I tried to get some answers from the ZK developers on what component caching strategy they use here: http://sourceforge.net/forum/message.php?msg_id=4314709
but no answer so far.

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answered 2007-05-29 13:37:48 +0800

admin
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Orignial message at:
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By: fedd

> Did you try using jmat/jhat?

no, i used my own little program, that used this

http://java.sun.com/javase/6/docs/jdk/api/jpda/jdi/com/sun/jdi/ObjectReference.h
tml#referringObjects(long)

this happens during both development and production using. the reloadable is not switched off but i never upload new classes to the system while tomcat's running

i dont think that this is a beanshell issue because in my real case the array is put to the desktop attribute hashmap by java method in the class that extends zk's window but not by zscript

i've read your and some other's posts and also thought about their cache. i thought they use weak references in their cache so that when the desktopn is unused it could get garbage collected... but i have no strong references...