XOM API for Processing XML with Java

["Marcus Downing" <marcus AT minotaur.it>]

I've successfully used XOM on many reasonable-sized documents. Now I
need to parse a 10Mb xml document, and the memory usage is just too
much.

I manage to process about 90% of the elements before hitting an
OutOfMemoryError, which suggests that something is a being assigned
and held onto as each element is parsed. Is there anything I should be
doing to minimise the memory use or release elements which are no
longer needed?

A simplified version of my code, with almost everything removed for clarity:

//  document
FileInputStream in = new FileInputStream(file);
Builder builder = new Builder();
Document document = builder.build(in, "");
Element rootElement = document.getRootElement();
Element resultSetElement =
rootElement.getFirstChildElement("RESULTSET",
"http://www.filemaker.com/fmpxmlresult";);

//  column headings
Element metaDataElement = rootElement.getFirstChildElement("METADATA",
"http://www.filemaker.com/fmpxmlresult";);
Elements fieldElements = metaDataElement.getChildElements("FIELD",
"http://www.filemaker.com/fmpxmlresult";);
fieldNames = new String[fieldElements.size()];
for (int i = 0, n = fieldElements.size(); i < n; i++) {
    Element fieldElement = fieldElements.get(i);
    fieldNames[i] = fieldElement.getAttributeValue("NAME");
}

//  data
Elements rows = resultSetElement.getChildElements("ROW",
"http://www.filemaker.com/fmpxmlresult";);
int size = rows.size();
for (int i = 0; i < size; i++) {
    Element rowElement = rows.get(i);
    parseRow(rowElement);
}


-- 
Marcus Downing