Exceptions of this type may be thrown by user-defined XPathFunction implementations. Note that this is a subclass of XPathExpressionException.

Figure 20-22. javax.xml.xpath.XPathFunctionException

public class XPathFunctionException extends XPathExpressionException {
// Public Constructors
     public XPathFunctionException(Throwable cause);  
     public XPathFunctionException(String message);  
}

Thrown By

XPathFunction.evaluate( )