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Struts & Hibernate
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| | | Memory problems | Memory problems 2003-12-29 - By Pramodh Peddi
Back
Hi,
I am using JDOM for XML processing. I use SAXBuilder. I am having memory
problems when it deals with huge documents (like 10MB), even though it is using
SAXBuidler. It throws OutOfMemoryError when I try to build a 8MB document.
I assume it does not keep the whole tree in memory if I use SAXBuilder. Does it
? If what I assume is right, why is it running out of memory while building the
doc of 8MB xml? 8MB should not be enough to make fail because of memory
problems. right?
This is how I build a document:
*******************************************************************************
*********************
public Document getDocumentfromString(String xmlString)
throws JDOMException, IOException {
Document schemaDoc = null;
SAXBuilder builder = new SAXBuilder(false);
String resultingXML = null;
byte[] xmlBytes = null;
try {
//get the UTF 8 encoded bytes
xmlBytes = xmlString.getBytes("UTF8");
schemaDoc = builder.build(new ByteArrayInputStream(xmlBytes));
} catch (UnsupportedEncodingException usee) {
// system does not support UTF-8 encoding. use default encoding
schemaDoc = builder.build(new StringReader(xmlString));
}
return schemaDoc;
}
*******************************************************************************
**********************
Am I doing anything wrong to make it fail while building a 8MB doc?
Do you think using JAXP API (again, using SAX) is better memory wise?
Any help would be greatly appreciated!
Thanks,
Pramodh.
?<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; CHARSET=UTF-8">
<META content="MSHTML 6.00.2800.1276" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Hi,</FONT></DIV>
<DIV><FONT face=Arial size=2>I am using JDOM for XML processing. I use
SAXBuilder. I am having memory problems when it deals with huge documents (like
10MB), even though it is using SAXBuidler. It throws OutOfMemoryError when I
try
to build a 8MB document.</FONT></DIV>
<DIV><FONT face=Arial size=2>I assume it does not keep the whole tree in memory
if I use SAXBuilder. Does it? If what I assume is right, why is it running
out of memory while building the doc of 8MB xml? 8MB should not be enough
to make fail because of memory problems. right?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>This is how I build a document:</FONT></DIV>
<DIV><FONT face=Arial
size=2>************************************************************************
****************************</FONT></DIV>
<DIV><FONT face=Arial size=2> public Document
getDocumentfromString(String
xmlString)<BR> throws JDOMException,
IOException {<BR> Document schemaDoc
=
null;<BR> SAXBuilder builder = new
SAXBuilder(false);<BR> String
resultingXML = null;<BR> byte[]
xmlBytes = null;</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2> try
{<BR> //get
the UTF 8 encoded
bytes<BR>
xmlBytes =
xmlString.getBytes("UTF8");<BR>
schemaDoc = builder.build(new
ByteArrayInputStream(xmlBytes));<BR>
}
catch (UnsupportedEncodingException usee)
{<BR>
// system does not support UTF-8 encoding. use default
encoding <BR>
schemaDoc = builder.build(new
StringReader(xmlString));<BR>
}</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2> return
schemaDoc;<BR> }</FONT></DIV>
<DIV><FONT face=Arial
size=2>************************************************************************
*****************************</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Am I doing anything wrong to make it
fail while building a 8MB doc?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Do you think using JAXP API (again, using SAX) is
better memory wise?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Any help would be greatly appreciated!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Pramodh.</FONT></DIV></BODY></HTML>
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