users@jaxb.java.net

Re: Optimizing JAXB RI Marshal performance

From: Iaroslav Savytskyi <iaroslav.savytskyi_at_oracle.com>
Date: Mon, 24 Sep 2012 09:41:51 +0200

Hi,

You can try to initialize collections before calling the marshalling.
(e.g. calling size() ). Perhaps this will help to find the bottleneck.

--
Yaroslav
On 21/09/12 19:48, Farrukh Najmi wrote:
> Hi Wolfgang,
>
> Please see inline below (and thanks for your help)...
>
> On 09/21/2012 12:39 PM, Wolfgang Laun wrote:
>> Also, how many fields are there to be marshalled, in the POJO and any
>> contained objects?
>
> Please see a copy of the POJO XML here:
>
> http://www.wellfleetsoftware.com/files/tmp/big-auditable-event.xml
>
> There are many contained fields including collections that have a few
> hundred members.
>
> I noticed in debugger that if I do two back to back marshals of same
> object then second time is very fast.
> This made me realize that the POJO was created by hibernate with lazy
> init of collections whichh required db access the first time but not the
> second time.
>
> So perhaps this is not a JAXB issue after all?
>
>>
>> On 21/09/2012, Wolfgang Laun <wolfgang.laun_at_gmail.com> wrote:
>>> How big is the resulting XML?
>
> 27KB
>
>>> On 21/09/2012, Farrukh Najmi <farrukh_at_wellfleetsoftware.com> wrote:
>>>> (Resending with subject corrected... Please reply to this thread
>>>> instead
>>>> of previous one)
>>>>
>>>> Hi Guys,
>>>>
>>>> I am observing a 5 second delay in marshalling a POJO to XML using JAXB
>>>> / JAXB-RI 2.2.3.
>>>>
>>>> The size of the POJO is 27K (measured by writing to file). The
>>>> marshaling was to a StringWriter using code like this:
>>>>
>>>> JAXBElement elem = ...
>>>> if (elem != null) {
>>>> StringWriter sw = new StringWriter();
>>>> marshaller.marshal(elem, sw);
>>>> }
>>>>
>>>> This seems excessive a delay but I have nothing to compare it to. Any
>>>> thoughts on whether this seems reasonable?
>>>> Are there any tricks to speed this up? Thanks for your help.
>>>>
>>>> --
>>>> Regards,
>>>> Farrukh Najmi
>>>>
>>>> Web: http://www.wellfleetsoftware.com
>>>>
>>>>
>
>