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https://issues.apache.org/jira/browse/XERCESJ-1516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Glavassevich updated XERCESJ-1516:
------------------------------------------

    Description: 
An XSDTypeAlternativeTraverser is always created by the XSDHandler, regardless 
of whether we're doing XML Schema 1.1 processing. This causes us to load 
Eclipse PsychoPath even when it's not going to be used. By only creating an 
XSDTypeAlternativeTraverser in XML Schema 1.1 mode we can avoid loading 
PsychoPath classes in XML Schema 1.0 mode.

This should allow people to continue using Xerces without having to include 
PsychoPath on their class path. With Xerces-J 2.11.0 they would get the 
following stack trace without the jar:

Exception in thread "main" java.lang.NoClassDefFoundError: 
org/eclipse/wst/xml/xpath2/processor/XPathParserException
  at org.apache.xerces.impl.xs.traversers.XSDHandler.createTraversers(Unknown 
Source)
  at org.apache.xerces.impl.xs.traversers.XSDHandler.prepareForTraverse(Unknown 
Source)
  at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(Unknown Source)
  ...

  was:
An XSDTypeAlternativeTraverser is always created by the XSDHandler, regardless 
of whether we're doing XML Schema 1.1 processing. This causes us to load 
Eclipse PsychoPath even when it's not going to be used. By only creating an 
XSDTypeAlternativeTraverser in XML Schema 1.1 mode we can avoid loading 
PsychoPath classes in XML Schema 1.0 mode.

This should allow people to continue using Xerces without having to include 
PsychoPath on their class path. With Xerces-J 2.11.0 they would get the 
following stack trace without the jar:

Exception in thread "main" java.lang.NoClassDefFoundError: 
org/eclipse/wst/xml/xpath2/processor/XPathParserException
        at 
org.apache.xerces.impl.xs.traversers.XSDHandler.createTraversers(Unknown Source)
        at 
org.apache.xerces.impl.xs.traversers.XSDHandler.prepareForTraverse(Unknown 
Source)
        at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(Unknown 
Source)
        ...


> Delay loading of Eclipse PsychoPath classes until an XML Schema 1.1 processor 
> is used.
> --------------------------------------------------------------------------------------
>
>                 Key: XERCESJ-1516
>                 URL: https://issues.apache.org/jira/browse/XERCESJ-1516
>             Project: Xerces2-J
>          Issue Type: Improvement
>          Components: XML Schema 1.1 Structures
>    Affects Versions: 2.11.0
>            Reporter: Michael Glavassevich
>            Priority: Minor
>
> An XSDTypeAlternativeTraverser is always created by the XSDHandler, 
> regardless of whether we're doing XML Schema 1.1 processing. This causes us 
> to load Eclipse PsychoPath even when it's not going to be used. By only 
> creating an XSDTypeAlternativeTraverser in XML Schema 1.1 mode we can avoid 
> loading PsychoPath classes in XML Schema 1.0 mode.
> This should allow people to continue using Xerces without having to include 
> PsychoPath on their class path. With Xerces-J 2.11.0 they would get the 
> following stack trace without the jar:
> Exception in thread "main" java.lang.NoClassDefFoundError: 
> org/eclipse/wst/xml/xpath2/processor/XPathParserException
>   at org.apache.xerces.impl.xs.traversers.XSDHandler.createTraversers(Unknown 
> Source)
>   at 
> org.apache.xerces.impl.xs.traversers.XSDHandler.prepareForTraverse(Unknown 
> Source)
>   at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(Unknown 
> Source)
>   ...

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