Have you thought about using a buffered writer ?
On Wed October 26 2005 4:08 pm, E.R. van Es wrote:
> Hello Velocity List,
>
> i have to create some big monthly reports on CD. I use a simple java
> program to generate all reports in HTML files using velocity templates.
> All data is pre-loaded and then the reports are created by iterating over
> the data. However, there are too many files to create (over 9600) and
> after file 7850 I get a java memory exception. I use a scheme like this:
>
> *** JAVA CODE ***
> private Context context;
>
> private void processData() {
> ArrayList data = getDataKeys(); // this returns an array with all "data
> keys" Iterator i = data.iterator();
> while (i.hasNext()) {
> String key = (String) i.next();
> ArrayList data = getData(key); // get all data objects for
> this key.
> context.put("key", key);
> context.put("data", data);
> processTemplate("template.vm", key + ".html");
> }
> }
>
> private void processTemplate(String template, String outputFile) {
> FileWriter outputFileWriter = new FileWriter(new File(outputFile));
>
> Template x = Velocity.getTemplate(template);
> x.merge(context, outputFileWriter);
>
> outputFileWriter.close();
> }
> *** JAVA CODE END ***
>
> *** TEMPLATE CODE ***
> <html>
> ... bla bla ...
> #foreach ( $el in $data )
> $data.getX()<br>
> $data.getY()<br>
> and so on and so forth...
> #end
> ... bla bla ...
> </html>
> *** TEMPLATE CODE END ***
>
> As you can see I put every data class in the context with identifier
> "data", my thought was to overwrite the previous one and NOT get a memory
> problem, however I do get the memory problem. I can adjust the java memory
> allocation to 1Gb but I was wondering if my approach just isn't correct?
> I'm not sure about the processTemplate method, though it workes perfectly
> for the first 7800 files :) By the way: I'm using velocity-1.4.
>
> Thanks in advance,
> Eric
>
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