DO NOT REPLY [Bug 28304] New: - NullPointerException from empty choice in restriction

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http://issues.apache.org/bugzilla/show_bug.cgi?id=28304

NullPointerException from empty choice in restriction

           Summary: NullPointerException from empty choice in restriction
           Product: Xerces2-J
           Version: 2.6.2
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: XML Schema Structures
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


Attempting to validate (or at least preparse) the following schema:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="extendableType"
xmlns:xs="http://www.w3.org/2001/XMLSchema"; xmlns:np="extendableType"
elementFormDefault="qualified" attributeFormDefault="unqualified">
    <xs:complexType name="extendableType">
        <xs:choice>
            <xs:any minOccurs="0" maxOccurs="unbounded"/>
        </xs:choice>
    </xs:complexType>    
    <xs:complexType name="extendedType">
        <xs:complexContent>
            <xs:restriction base="np:extendableType">
                <xs:choice/>
            </xs:restriction>
        </xs:complexContent>
    </xs:complexType>
</xs:schema>

results in:

java.lang.NullPointerException
        at
org.apache.xerces.impl.xs.XSModelGroupImpl.minEffectiveTotalRangeChoice(Unknown
Source)
        at
org.apache.xerces.impl.xs.XSModelGroupImpl.minEffectiveTotalRange(Unknown Source)
        at
org.apache.xerces.impl.xs.XSParticleDecl.minEffectiveTotalRange(Unknown Source)
        at
org.apache.xerces.impl.xs.XSConstraints.particleValidRestriction(Unknown Source)
        at
org.apache.xerces.impl.xs.XSConstraints.particleValidRestriction(Unknown Source)
        at org.apache.xerces.impl.xs.XSConstraints.fullSchemaChecking(Unknown
Source)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
        at org.apache.xerces.parsers.XMLGrammarPreparser.preparseGrammar(Unknown
Source)

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