IT38611: ABEND VALIDATING ELEMENT SUBJECT TO AN IDENTITY CONSTRAINT WHEN THE ELEMENT OR CHILD IS NULL IN THE XMLNSC PARSER

APAR status

• Closed as program error.

Error description

• If an XML message is parsed with validation enabled and an
  element is subject to an identity constraint (e.g. a <xs:unique>
  constraint) and the element itself or one of its children is
  nillable and nil then an abend will occur. The abend stack may
  not resolve correctly, if it does resolve correctly then the
  following stack is expected:
  
  IDCContext_endIDCStateHistoryContext in libBIPNVBRT.so
  Instructions_endIDC in libBIPNVBRT.so
  VMContext_handleEndElementEvent in libBIPNVBRT.so
  VMScannerEventQueue_produceEndElementEvent in libBIPNVBRT.so
  VMScannerEventQueue_scanEndElement in libBIPNVBRT.so
  DocumentEntityScanner_stateUnbufferedEndElement in
  libBIPNVBRT.so
  xlxpc::XLXPCParser::parseAll in libBIPNVBRT.so
  
  An example message that can cause the abend is
  
  <A xmlns="http://www.example.org/Test"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:nil="true" />
  
  when validated against the following schema:
  
  <?xml version="1.0" encoding="UTF-8"?>
  <schema xmlns="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.example.org/Test"
  xmlns:tns="http://www.example.org/Test"
  elementFormDefault="qualified">
  	<element name="A" nillable="true" type="string">
  		<unique name="idx">
  			<selector xpath=".//tns:Id" />
  			<field xpath="tns:IdField"/>
  		</unique>
  	</element>
  </schema>
  

Local fix

• Disable validation, remove the nil elements, or remove the
  identity constraint.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of the XMLNSC parser in IBM App Connect Enterprise v11
  or v12
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  If an XML message is parsed with validation enabled and an
  element is subject to an identity constraint (e.g. a <xs:unique>
  constraint) and the element itself or one of its children is
  nillable and nil then an abend will occur. The abend stack may
  not resolve correctly, if it does resolve correctly then the
  following stack is expected:
  
  IDCContext_endIDCStateHistoryContext in libBIPNVBRT.so
  Instructions_endIDC in libBIPNVBRT.so
  VMContext_handleEndElementEvent in libBIPNVBRT.so
  VMScannerEventQueue_produceEndElementEvent in libBIPNVBRT.so
  VMScannerEventQueue_scanEndElement in libBIPNVBRT.so
  DocumentEntityScanner_stateUnbufferedEndElement in
  libBIPNVBRT.so
  xlxpc::XLXPCParser::parseAll in libBIPNVBRT.so
  
  An example message that can cause the abend is
  
  <A xmlns="http://www.example.org/Test"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:nil="true" />
  
  when validated against the following schema:
  
  <?xml version="1.0" encoding="UTF-8"?>
  <schema xmlns="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.example.org/Test"
  xmlns:tns="http://www.example.org/Test"
  elementFormDefault="qualified">
      <element name="A" nillable="true" type="string">
          <unique name="idx">
              <selector xpath=".//tns:Id" />
              <field xpath="tns:IdField"/>
          </unique>
      </element>
  </schema>
  

Problem conclusion

• The product now correctly handles such identity constraints.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v11.0      11.0.0.16
  v12.0      12.0.7.0
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  APP CONNECT ENT

• Fixed component ID

  5724J0550

Applicable component levels