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https://issues.apache.org/jira/browse/FREEMARKER-207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dániel Dékány resolved FREEMARKER-207.
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Fix Version/s: 2.3.32
Resolution: Fixed
> Slow processing of large xml files freemarker
> ---------------------------------------------
>
> Key: FREEMARKER-207
> URL: https://issues.apache.org/jira/browse/FREEMARKER-207
> Project: Apache Freemarker
> Issue Type: Bug
> Components: engine
> Affects Versions: 2.3.29, 2.3.31
> Reporter: Gert Van der Voorde
> Priority: Major
> Labels: performance
> Fix For: 2.3.32
>
>
> I had a problem when using Freemarker with xml 's containing large content (
> > 600KB)
> The problem is in the class ElementModel in method getAsTring in package
> freemarker.ext.dom.
> The number of nodes were high, more then 10 000 and when using String
> concatenation as in the following snippet the performance was/is very poor.
> {code:java}
> @Override
> public String getAsString() throws TemplateModelException {
> NodeList nl = node.getChildNodes();
> String result = "";
> for (int i = 0; i < nl.getLength(); i++) {
> Node child = nl.item(i);
> int nodeType = child.getNodeType();
> if (nodeType == Node.ELEMENT_NODE) {
> String msg = "Only elements with no child elements can be
> processed as text."
> + "\nThis element with name \""
> + node.getNodeName()
> + "\" has a child element named: " +
> child.getNodeName();
> throw new TemplateModelException(msg);
> } else if (nodeType == Node.TEXT_NODE || nodeType ==
> Node.CDATA_SECTION_NODE) {
> result += child.getNodeValue();
> }
> }
> return result;
> } {code}
> For a xml file of 600kb this took 6 to 11 seconds to process.
> When using a StringBuilder this takes 60 ms.
>
> I already made a pull request for this :
> https://github.com/apache/freemarker/pull/82
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