NullPointerException with class QNameDV method getActualValue
-------------------------------------------------------------
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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