[Info-vax] help needed diagnosing/debugging java.lang.OutOfMemoryError

[Arne Vajhøj]

On 8/18/2011 8:43 AM, VAXman- @SendSpamHere.ORG wrote:
> In article<4e4c6bba$0$308$14726298 at news.sunsite.dk>, =?ISO-8859-1?Q?Arne_Vajh=F8j?=<arne at vajhoej.dk>  writes:
>> On 8/17/2011 8:23 AM, VAXman- @SendSpamHere.ORG wrote:
>>> In article<4e4b2601$0$314$14726298 at news.sunsite.dk>, =?ISO-8859-1?Q?Arne_Vajh=F8j?=<arne at vajhoej.dk>   writes:
>>>> On 8/16/2011 9:59 PM, VAXman- @SendSpamHere.ORG wrote:
>>>>> In article<4e4b055e$0$314$14726298 at news.sunsite.dk>, =?ISO-8859-1?Q?Arne_Vajh=F8j?=<arne at vajhoej.dk>    writes:
>>>>>> On 8/16/2011 9:07 AM, VAXman- @SendSpamHere.ORG wrote:
>>>>>>> In article<4e49c081$0$314$14726298 at news.sunsite.dk>, =?ISO-8859-1?Q?Arne_Vajh=F8j?=<arne at vajhoej.dk>     writes:
>>>>>>>> On 8/15/2011 8:43 PM, VAXman- @SendSpamHere.ORG wrote:
>>>>>>>>> In article<4e4994ad$0$312$14726298 at news.sunsite.dk>, =?ISO-8859-1?Q?Arne_Vajh=F8j?=<arne at vajhoej.dk>      writes:
>>>>>>>>>> On 8/15/2011 2:11 PM, VAXman- @SendSpamHere.ORG wrote:
>>>>>>>>>>> What the subject says...
>>>>>>>>>>>
>>>>>>>>>>> An application in development for use on an OpenVMS system is tossing up
>>>>>>>>>>> this error.  I've increased the page file quota for APACHE$WWW to 1M and
>>>>>>>>>>> there is still this error.  The logs produced by this Java stuff do not
>>>>>>>>>>> tell much.  Is there some way to get a dump or more logging?
>>>>>>>>>>>
>>>>>>>>>>> PS. I don't do Java (unless it's in my coffee mug) and thus, I'm not the
>>>>>>>>>>> one developing the app.
>>>>>>>>>>
>>>>>>>>>> First: 512 MB is not that much today.
>>>>>>>>>>
>>>>>>>>>> Second: what value does the -Xmx option for the java command? (it also
>>>>>>>>>> limits the maximum memory that can be allocated)
>>>>>>>>>
>>>>>>>>> Well, it pukes with -Xmx384m
>>>>>>>>
>>>>>>>> Then try 512m 768m 1024m (and make sure that there is backing for it).
>>>>>>>
>>>>>>> The STARTUP pukes @ -Xmx384m complaining about memory.
>>>>>>
>>>>>> Does the account starting the app have more
>>>>>> than 384 MB available (page file quota)?
>>>>>
>>>>> SYSTEM account has 2000000 on this particular machine.  That's a gig in
>>>>> my book.
>>>>
>>>> Yup.
>>>>
>>>> What exactly does "pukes" mean?
>>>
>>> the out of memory errors.
>>>
>>>> And what Java version?
>>>
>>> 1.5.07  This is on Alpha.
>>
>> Does it run with 768m?
>
> If Java won't start with more than 256m and the application pukes on that,
> there's little chance of 768m.

????

java.lang.OutOfMemoryError means that the apps code can not allocate
the desired memory from the Java heap.

Xmx limits the size of the Java heap.

So in case of java.lang.OutOfMemoryError the first thing to try is to
increase Xmx.

If the JVM can not get Xmx from VMS, then you will get a different
type of error.

Arne