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Poor performance when processing XML schemas with high values of maxOccurs

Troubleshooting


Problem

IBM® Rational® Application Developer v7.0 may remain unresponsive with 100% CPU usage when opening XML documents. These documents are instances of XML schemas with a maxOccurs definition for an element.

Symptom

The problem can be identified by examining the following:

  • The XML schema contains an XML element definition with a high value for minOccurs or maxOccurs:


    <element name="request">
    <complexType>
    <sequence>
    <element name="foo" type="string" maxOccurs="250000"/>
    </sequence>
    </complexType>
    </element>

  • During the 100% CPU usage one job is running with the following call stack found in javacore.txt


    "Worker-3" (TID:0x3CC36500, sys_thread_t:0x394A5988, state:CW, native ID:0x00000F18) prio=5
    at org/apache/xerces/impl/dtd/models/CMStateSet.<init>(Bytecode PC:80(Compiled Code))
    at org/apache/xerces/impl/xs/models/XSDFACM.buildDFA(Bytecode PC:102)
    at org/apache/xerces/impl/xs/models/XSDFACM.<init>(Bytecode PC:71)
    at org/apache/xerces/impl/xs/models/CMBuilder.createDFACM(Bytecode PC:31)
    at org/apache/xerces/impl/xs/models/CMBuilder.getContentModel(Bytecode PC:70)
    at org/apache/xerces/impl/xs/XSComplexTypeDecl.getContentModel(Bytecode PC:10)
    at org/apache/xerces/impl/xs/XMLSchemaValidator.handleStartElement(Bytecode PC:1177)
    at org/apache/xerces/impl/xs/XMLSchemaValidator.startElement(Bytecode PC:4)
    at org/apache/xerces/impl/XMLNamespaceBinder.handleStartElement(Bytecode PC:790)
    at org/apache/xerces/impl/XMLNamespaceBinder.startElement(Bytecode PC:12)
    at org/apache/xerces/impl/dtd/XMLDTDValidator.startElement(Bytecode PC:24)
    at org/apache/xerces/impl/XMLDocumentFragmentScannerImpl.scanStartElement(Bytecode:311(Compiled Code))
    at org/apache/xerces/impl/XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(Bytecode PC:100)
    at org/apache/xerces/impl/XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Bytecode PC:1017(Compiled Code))
    at org/apache/xerces/impl/XMLDocumentFragmentScannerImpl.scanDocument(Bytecode PC:26)
    at org/apache/xerces/parsers/DTDConfiguration.parse(Bytecode PC:62)
    at org/apache/xerces/parsers/DTDConfiguration.parse(Bytecode PC:29)
    at org/apache/xerces/parsers/XMLParser.parse(Bytecode PC:11)
    at org/apache/xerces/parsers/AbstractSAXParser.parse(Bytecode PC:43)
    at org/eclipse/wst/xml/core/internal/validation/XMLValidator.validate(XMLValidator.java:276)

[{"Product":{"code":"SSRTLW","label":"Rational Application Developer for WebSphere Software"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":"XML Development","Platform":[{"code":"PF033","label":"Windows"},{"code":"PF016","label":"Linux"}],"Version":"7.0;7.0.0.1;7.0.0.2;7.0.0.3;7.0.0.4;7.0.0.5;7.0.0.6","Edition":"","Line of Business":{"code":"LOB77","label":"Automation Platform"}},{"Product":{"code":"SSYK2S","label":"Rational Software Architect Designer"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":"XML Development","Platform":[{"code":"PF016","label":"Linux"},{"code":"PF033","label":"Windows"}],"Version":"7.0;7.0.0.1;7.0.0.2;7.0.0.3;7.0.0.4;7.0.0.5;7.0.0.6","Edition":"All Editions","Line of Business":{"code":"LOB77","label":"Automation Platform"}}]

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Document Information

Modified date:
10 September 2020

UID

swg21296034

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