[XERCESJ-1605] NPE when comparing alternative types

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.11.0
• Fix Version/s: 2.12.0
• Component/s: XML Schema 1.1 Structures
• Assignee: Mukul Gandhi
• Reporter: Octavian Nadolu
• Created: 13/Feb/13 12:29
• Updated: 22/Jul/16 08:46
• Resolved: 15/Feb/13 00:44

Description

When I validate the following schema I get an NPE. It seems that one of the default alternative types is null. The schema is bigger but I extracted only a part of it, just to reproduce the problem.
I tested on the xml-schema-1.1-dev branch.

---- schema.xsd------------------------
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:complexType name="type1">
<xsd:choice>
<xsd:sequence>
<xsd:element name="Element1">
<xsd:alternative test="@index='3'" type="TypeI3"/>
<xsd:alternative type="TypeI5"/>
</xsd:element>
</xsd:sequence>
<xsd:sequence>
<xsd:element name="Element1">
<xsd:alternative test="@index='3'" type="TypeI3"/>
<xsd:alternative type="TypeI5"/>
<xsd:unique name="TypeI5_U">
<xsd:selector xpath="*"/>
<xsd:field xpath="@index"/>
</xsd:unique>
</xsd:element>
</xsd:sequence>
</xsd:choice>
</xsd:complexType>
<xsd:complexType name="TypeI3"/>
<xsd:complexType name="TypeI5"/>
</xsd:schema>
----------------------------------------------------------

----------- NPE------------------------------
java.lang.NullPointerException
at org.apache.xerces.impl.xs.XS11Constraints.isTypeAlternativesEquivalent(XS11Constraints.java:235)
at org.apache.xerces.impl.xs.XS11Constraints.isTypeTablesEquivalent(XS11Constraints.java:227)
at org.apache.xerces.impl.xs.XS11Constraints.findElemInTable(XS11Constraints.java:137)
at org.apache.xerces.impl.xs.XS11Constraints.checkElementDeclsConsistent(XS11Constraints.java:105)
at org.apache.xerces.impl.xs.XSConstraints.fullSchemaChecking(XSConstraints.java:422)
at org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:618)
at org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:577)
at org.apache.xerces.jaxp.validation.BaseSchemaFactory.newSchema(BaseSchemaFactory.java:223)
at XercesValidation.main(XercesValidation.java:256)
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