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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