NullPointerException with class QNameDV method getActualValue
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         Key: XERCESJ-1058
         URL: http://issues.apache.org/jira/browse/XERCESJ-1058
     Project: Xerces2-J
        Type: Bug
  Components: XML Schema API  
    Versions: 2.6.2    
Environment: Windows XP SP2 JRE 1.4.2_06-b03
    Reporter: vaseux mickael


Sorry for my english I'm french user of Xerces ...

Consequence : get a nullPointerException in Xample when using XMLSchema.xsd and set "type" attribute of an element with a prefix (example : "xs:string")

Here is the Exception :

java.lang.NullPointerException
at org.apache.xerces.impl.dv.xs.QNameDV.getActualValue(QNameDV.java:105)
at org.apache.xerces.impl.dv.xs.XSSimpleTypeDecl.getActualValue(Unknown Source)
at org.apache.xerces.impl.dv.xs.XSSimpleTypeDecl.validate(Unknown Source)
at com.fg.xmleditor.XSRef.validate(XSRef.java:119)
at com.fg.xmleditor.Validator.isValid(Validator.java:122)


Here is the code of the method :
public Object getActualValue(String content, ValidationContext context)
       throws InvalidDatatypeValueException {

       // "prefix:localpart" or "localpart"
       // get prefix and local part out of content
       String prefix, localpart;
       int colonptr = content.indexOf(":");
       if (colonptr > 0) {
           prefix = context.getSymbol(content.substring(0,colonptr));
           localpart = content.substring(colonptr+1);
       } else {
           prefix = EMPTY_STRING;
           localpart = content;
       }

       // both prefix (if any) a nd localpart must be valid NCName
       if (*prefix.length() > 0* && !XMLChar.isValidNCName(prefix))
           throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1", new Object[]{content, "QName"});

       if(!XMLChar.isValidNCName(localpart))
           throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1", new Object[]{content, "QName"});

       // resove prefix to a uri, report an error if failed
       String uri = context.getURI(prefix);
       if (prefix.length() > 0 && uri == null)
           throw new InvalidDatatypeValueException("UndeclaredPrefix", new Object[]{content, prefix});

       return new XQName(prefix, context.getSymbol(localpart), context.getSymbol(content), uri);

}

In fact, the function : context.getSymbol(content.substring(0,colonptr)) return the null value, and there's no test to see if the value returned is null or not.
There's is some tests, after, in order to see if prefix.length() is > 0 or not, that's show that the developper thinked that getSymbol return ALWAYS a String, which is empty if the symbol hasn't be found. In relity, yhe context can be return a null value in case of Dummy Context or Empty Context (see XSSimpleTypeDecl.class)

Solution : if the function return null, the prefix String must be set with EMPTY_STRING




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