Hi Jake,
We have been using this version of xerces since 2001. Mid of last year
(2011), we moved to powerful server. After this started seeing problem with
XML few times.
One of them is below mentioned. This happened twice in production
environment but we could not reproduce in test environment. Now we are
analyzing if this is really an issue with xerces 1.2 version and this won't
happen again if we upgrade to latest version.
Customers using our product are sensitive.
Thanks
karthik
From: "Jacob Kjome" <h...@visi.com>
To: <j-users@xerces.apache.org>
Date: 11/01/2012 09:34 PM
Subject: Re: Xerces clone node issue in production environment (Multi
threaded). Help needed ...
At the very least, you should try it with the latest version of Xerces1,
which
is 1.4.4. Asking Xerces developers and users to spend precious time
investigating a strange issue in an ancient release of a project that the
Xerces site lists as a "Hibernated project" is not in good form.
You need to do your own investigation first. Try the Xerces-1.4.4. That's
the same codebase as 1.2.0, but with bug fixes. If your issue is cleared
up,
then you're done. If not, then try the latest release. If your issue
clears
up, then you're done. If you still have the issue after trying all that,
ask
again and I'm sure you'll have plenty of takers on researching the issue.
Jake
On Thu, 1 Nov 2012 21:23:37 +0530
karthikeyan...@polarisft.com wrote:
Hi jake,
Thanks for the reply.
But we want to know whether it is an issue in 1.2.0.
Only if we make sure that is an issue in xerces 1.2.0 itself , only then
we can take steps to move to the latest version.
Thanks,
karthik.
From: "Jacob Kjome" <h...@visi.com>
To: <j-users@xerces.apache.org>
Date: 11/01/2012 09:15 PM
Subject: Re: Xerces clone node issue in production environment
(Multi
threaded). Help needed ...
If you are using Xerces 1.2.0, then you are using an ancient version...
of
Xerces1. That hasn't been actively developed for many years.
You should upgrade and see if your issue exists in the latest release of
Xerces2, which is version 2.11.0.
Jake
On Thu, 1 Nov 2012 18:44:27 +0530
karthikeyan...@polarisft.com wrote:
Hi Xerces users,
Greetings!.
We have an issue in the xerces parsers and specifically in cloning a
node.We browsed in apache's site and bugzilla to find if anyone had
reported any issues or bugs relevant to the one we are facing in our
production environment.
We were able to find info about few issue that were reported already and
that is more or less similar to the one we are facing now.
Let me brief out the environment wherein we are facing this issue.
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.
Here is sample XML that gets parsed.
<?xml version="1.0"?>
<!DOCTYPE InTemplate SYSTEM "feed_dd.dtd" >
<InTemplate>
<Header>
<DataDictionary>
<element XMLName="NumberOfTxn" CFCName="NO_TRANS"
CFCType="TYPE_STRING"/>
<element XMLName="ProcessingLoc" CFCName="PR_LOC"
CFCType="TYPE_STRING"/>
<element XMLName="ServiceType" CFCName="FCO_TYP"
CFCType="TYPE_STRING"/>
</DataDictionary>
</Header>
<Body>
<DataDictionary>
<element XMLName="TxnUID" CFCName="TRAN_NO" CFCType="TYPE_STRING"/>
<collection XMLName="TxnIdentification"
CFCType="TYPE_FIELDCOLLECTION">
<element XMLName="Sequence" CFCName="BSI_SEQ"
CFCType="TYPE_STRING"/>
<element XMLName="TxnType" CFCName="PYMT_TYP"
CFCType="TYPE_STRING"/>
<element XMLName="AcctNumber" CFCName="ACCT_NO"
CFCType="TYPE_STRING"/>
<element XMLName="CCY" CFCName="ACCT_CCY_COD"
CFCType="TYPE_STRING"/>
</collection>
<element XMLName="ProcessingLocCode" CFCName="PROC_LOCA"
CFCType="TYPE_STRING"/>
<element XMLName="Status" CFCName="STA" CFCType="TYPE_STRING"/>
<element XMLName="AuthNumS015" CFCName="MEX_AUTH_NO"
CFCType="TYPE_STRING"/> ( line no 20)
<element XMLName="AuthNumS502" CFCName="MEX_FOLIO_NO"
CFCType="TYPE_STRING"/>
<element XMLName="Reference" CFCName="MT942_REF_NO"
CFCType="TYPE_STRING"/>
</DataDictionary>
</Body>
</InTemplate>
Intially, we faced something like the whole attribute in one of the
child
nodes in XML itself gets missed .( like the one highlighted above in the
sample xml - the attribute CFCName="MEX_AUTH_NO" that got underlined
gets
missed).The returned XML doc is with out the 'CFCName' attribute and it
looks something like
<element XMLName="AuthNumS015"
CFCType="TYPE_STRING"/> (line
no 20)
To fix this we placed the following code
* Parameters:
* iNode - source
* deep - If true, recursively clone the subtree
under
the specified node; if false, clone only the node itself (and its
attributes, if it is an Element).
* return:
* copy of source ( xml document that was parsed)
*/
private Node cloneNode(Node inNode, boolean deep){
// clone current input node
Node outNode = inNode.cloneNode(deep);
outNode = getRenderer().getOutDocument().importNode
(outNode,true);
// put back attr.
if ( inNode.getNodeType() == Node.ELEMENT_NODE &&
inNode.hasAttributes() ){
NamedNodeMap attrMap = inNode.getAttributes();
Attr attr = null;
Attr outAttr = null ;
for ( int i=0; i<attrMap.getLength(); i++ ){
attr = (Attr)attrMap.item(i);
// only append deleted attr.
if ((((Element)outNode).getAttributeNode
(attr.getName())) == null ){
outAttr = getRenderer
().getOutDocument().createAttribute(attr.getName());
outAttr.setValue( attr.getValue
() );
((Element)outNode).setAttributeNode
(outAttr);
}
}
}
return outNode;
}
Even after that , we faced another issue ,but this time the value of the
attribute(CFCName) gets missed or it is empty like the one shown below
and
not the whole attribute as we faced before.
The xml after the attribute value missed looks something like
<element XMLName="AuthNumS015" CFCName="" CFCType="TYPE_STRING"/> [Here
u
can see the CFCName attribute value is empty (null)]
We are clueless about this and the most disheartening thing is that we
are
not able to reproduce this behavior consistently and this occurs
probably
once in 5-6 months in our environment.We tried different ways with the
threads in our IDE to reproduce but everything ended in vain.
The below issue reported in the following link is more or less similar
to
the one we are facing, but we are not able to see the whole mailing
thread
conversation from the site and hence seeking xerces users who reported
this
already to sort this out for us.
Clone node issue
Bug getOwnerElement for cloned attributes
http://mail-archives.apache.org/mod_mbox/xerces-j-users/200102.mbox/%3c3a843476.8a614...@us.ibm.com%3e
[Bug 937] Changed - cloneNode empties Attribute nodes
http://mail-archives.apache.org/mod_mbox/xerces-j-dev/200103.mbox/%3c200103121958.laa00...@nagoya-a.betaversion.org%3E
We would like to know
1.Is this issue a valid one?
2.Is this issue got fixed ,if so, in which xerces version ?.
3.Why we are not able to reproduce it consistently and what had actually
gone wrong.
sorry for the detailed explanation about issue but we have no other go.
Your help in this regard is very much appreciated.I am ready to give
more
info regarding this if needed
Thanks,
karthik,
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