Alright, I ran this little piece of code:
public static void main( String args[] ) throws Exception
{
/* first, we init the runtime engine. Defaults are fine. */
Velocity.init();
/* lets make a Context and put data into it */
VelocityContext context = new VelocityContext();
List results = ReportBean.runLargeReport();
context.put("List", results);
/* lets render a template */
StringWriter w = new StringWriter();
Velocity.mergeTemplate("/myfile.vm", context, w );
System.out.println(" template : " + w );
/* lets make our own string to render */
}
results is a List of 66000 objects and requires about 8megs of memory. The
"mergeTemplate" requires at least 230 MB of memory. Any suggestions?
-L
On Fri, May 06, 2005 at 11:53:30AM -0700, jian chen wrote:
> Hi,
>
> I guess the writer Ilkka talked about is when using Velocity as a
> standalone template engine.
>
> Right now I don't have a good clue, could you run Velocity as a
> standalone template engine and render the page to see if there is a
> huge memory usage?
>
> Cheers,
>
> Jian
>
> On 5/6/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > Sorry, I'm not sure what you mean by what "kind of writer" I'm using.
> > Where would I find out? How would I change this (to maybe a StringBuffer
> > writer?)
> >
> > Also, each column contains a String that is at most, 200 characters, most
> > are closer to 10-20. There are a total of 10 columns.
> >
> > Thanks.
> >
> > -Lawrence
> >
> > On Fri, May 06, 2005 at 09:11:13PM +0300, Ilkka Priha wrote:
> > > What kind of writer are you using and how long are the items? 66 000 HTML
> > > table rows with 5 numeric columns consumes about 32 MB when buffered into
> > > a
> > > string writer. If the items are longer, it takes much more memory.
> > >
> > > -- Ilkka
> > >
> > >
> > > [EMAIL PROTECTED] wrote:
> > > >I tried putting static HTML in the #foreach loop, same problem. Then I
> > > >tried setting the large list as a "local" varible:
> > > >
> > > >#set ($localList = $List)
> > > >#foreach($row in $localList)
> > > >...
> > > >
> > > >but that didnt help either. I don't see why velocity should use 250+ MB
> > > >of memory iterating over a list ~8MB in size...
> > > >-L
> > > >
> > > >On Thu, May 05, 2005 at 02:56:28PM -0700, jian chen wrote:
> > > >
> > > >>Well, I don't have a good clue now.
> > > >>
> > > >>What about do the debugging step by step, i.e., use just static html
> > > >>in your #foreach loop? Will that blow up the memory?
> > > >>
> > > >>Cheers,
> > > >>
> > > >>Jian
> > > >>
> > > >>
> > > >>
> > > >>On 5/5/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > > >>
> > > >>>Thanks for the suggestion. I tried putting that, along with
> > > >>>
> > > >>>file.resource.loader.cache = true
> > > >>>
> > > >>>in my velocity.properties file. Both did not work. Any other
> > > >>>suggestions?
> > > >>>
> > > >>>Thanks!
> > > >>>
> > > >>>-L
> > > >>>
> > > >>>On Thu, May 05, 2005 at 02:11:28PM -0700, jian chen wrote:
> > > >>>
> > > >>>>Hi,
> > > >>>>
> > > >>>>This maybe because you haven't turned on template caching. I had
> > > >>>>similar problem before, and even if I only used evaluate(...) method
> > > >>>>and load the template using my own java program, it happened when the
> > > >>>>for loop is lot of iterations.
> > > >>>>
> > > >>>>The bottom line for my problem is I need to turn on template caching,
> > > >>>>so, velocity will not try to cache the objects it parsed during each
> > > >>>>time of the iteration.
> > > >>>>
> > > >>>>I did:
> > > >>>>ri.setProperty(RuntimeConstants.FILE_RESOURCE_LOADER_CACHE, "true");
> > > >>>>
> > > >>>>where ri is a runtime instance.
> > > >>>>
> > > >>>>Will this fix your issue?
> > > >>>>
> > > >>>>Cheers,
> > > >>>>
> > > >>>>Jian
> > > >>>>
> > > >>>>
> > > >>>>On 5/5/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> > > >>>>
> > > >>>>>I am getting an OutOfMemoryException:
> > > >>>>>
> > > >>>>>org.apache.velocity.exception.MethodInvocationException: Invocation
> > > >>>>>of
> > > >>>>>method 'get' in class org.apache.velocity.tools.struts.TilesTool
> > > >>>>>threw exception class java.lang.OutOfMemoryError : null
> > > >>>>>
> > > >>>>>when I am creating a large velocity file. The vm file itself is
> > > >>>>>fairly small, but this piece of velocity is causing the exception:
> > > >>>>>
> > > >>>>>#foreach($row in $List)
> > > >>>>><tr>
> > > >>>>><td height="20" class="tbltxt">$!row.item1</td>
> > > >>>>><td class="tbltxt">$!row.item2</td>
> > > >>>>><td class="tbltxt">$!row.item3</td>
> > > >>>>><td class="tbltxt">$!row.item4</td>
> > > >>>>><td class="tbltxt">$!number.format('currency', $!row.item5)</td>
> > > >>>>></tr>
> > > >>>>>#end
> > > >>>>>
> > > >>>>>List is a list of relatively small objects (5-6 Strings, a couple of
> > > >>>>>BigDecimals), but the List itself contains approximately 66,000
> > > >>>>>entries. Unfortunately, unless I set the tomcat JVM to use a heap
> > > >>>>>size of at least 256M, this velocity template throws an
> > > >>>>>OutOfMemoryException when it is being processed.
> > > >>>>>
> > > >>>>>Any suggestions?
> > > >>>>>
> > > >>>>>Thanks.
> > > >>>>>
> > > >>>>>-L
> > > >>>>>
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