I ran into the same issue last year, we had a pretty healthy discussion about
it here
http://mail-archives.apache.org/mod_mbox/xerces-j-users/201106.mbox/browser
Just a few synchronized(){} blocks around the DOM API and everything is fine.
No easily noticeable drop in performance, though I haven't yet measured, and if
I did it would probably be noticeable.
I think most people still agree there should be a thread safe implementation of
the parser, but the authors of xerces were pretty clear that it isn't going to
happen...
-----Original Message-----
From: karthikeyan...@polarisft.com [mailto:karthikeyan...@polarisft.com]
Sent: Friday, October 12, 2012 07:51
To: j-users@xerces.apache.org; j-users-i...@xerces.apache.org;
j-...@xerces.apache.org
Subject: Why DOM Parser is not thread safe? Please explain
Apache Team,
Major concern for us with DOM parser in multi thread environment. Can you
please review this and provide your inputs? Thanks.
OS: Sun Solaris 10
Server: Websphere 6
JDK: 1.4
Xerces version: Xerces_Version_1_2_0
Number of Daemon threads per JVM: 3
Scenario:
In our Production environment when 3 daemon threads run under a JVM.
When 3 similar type of XML messages gets parsed at same second
(concurrently) under a JVM, we notice some attribute gets missed. We went
through net and found that DOM implementation is not guaranteed to be thread
safe. But question is why it is not thread safe? Which part can go wrong?
Please provide details.
Below is the piece of code:
public Document parse(InputSource inputSource, boolean isValidating) throws
SAXException,IOException {
if ( getEntityResolver() == null )
throw new IllegalStateException("EnitityResolver is not set");
DocumentBuilder docBuilder = getDocumentBuilder(isValidating);
// parsing from input source
docBuilder.setEntityResolver(getEntityResolver());
docBuilder.setErrorHandler (getErrorHandler());
return docBuilder.parse(inputSource);
}
Sample xml passed to this code is attached: sample_message.xml
(See attached file: sample_message.xml)
Thanks,
karthik
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