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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 14505] New: - Allow accessor to throw exceptions
Date Wed, 13 Nov 2002 14:34:59 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=14505

Allow accessor to throw exceptions

           Summary: Allow accessor to throw exceptions
           Product: Commons
           Version: 1.0 Final
          Platform: PC
        OS/Version: Windows NT/2K
            Status: UNCONFIRMED
          Severity: Enhancement
          Priority: Other
         Component: JXPath
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: kpetersen@travis.com


Overview Description:
I am trying to use JXPath for accessing properties objects of different
types. Among the instances that I need to access, are objects of
implementations that contains methods responding to invokations by throwing
an Exception. This will cause the JXPath implementation to fail when
processing XPath expressions like "//property". I have attached an example.

Would it be possible to alter the JXPath implementation to ignore methods
that respond to invokations by throwing an Exception?


Steps to Reproduce: 
Execute the following test class
-----------------
import org.apache.commons.jxpath.JXPathContext;

public class JXPathTestObject {
    public String getException(){
        throw new NullPointerException("");
    }
    public void setException(String value){}

    public String getValue(){
        return "value";
    }

    public void setValue(String value){}

    public static void main(String[] args){
        JXPathTestObject object = new JXPathTestObject();
        String value = (String)JXPathContext.newContext(object).getValue
("//test");
        System.out.println(value);

        System.out.println("READY.");
    }
}
-----------------


Actual Results:
org.apache.commons.jxpath.JXPathException: Cannot access property: exception; 
java.lang.reflect.InvocationTargetException
	at org.apache.commons.jxpath.util.ValueUtils.getValue
(ValueUtils.java:290)
	at 
org.apache.commons.jxpath.ri.model.beans.BeanPropertyPointer.getBaseValue
(BeanPropertyPointer.java:161)
	at 
org.apache.commons.jxpath.ri.model.beans.BeanPropertyPointer.getLength
(BeanPropertyPointer.java:149)
	at 
org.apache.commons.jxpath.ri.model.beans.PropertyIterator.setPositionAllProperti
es(PropertyIterator.java:207)
	at org.apache.commons.jxpath.ri.model.beans.PropertyIterator.setPosition
(PropertyIterator.java:149)
	at org.apache.commons.jxpath.ri.axes.DescendantContext.nextNode
(DescendantContext.java:139)
	at org.apache.commons.jxpath.ri.EvalContext.nextSet
(EvalContext.java:344)
	at org.apache.commons.jxpath.ri.axes.ChildContext.getSingleNodePointer
(ChildContext.java:113)
	at 
org.apache.commons.jxpath.ri.compiler.Path.getSingleNodePointerForSteps
(Path.java:175)
	at org.apache.commons.jxpath.ri.compiler.LocationPath.computeValue
(LocationPath.java:137)
	at org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue
(JXPathContextReferenceImpl.java:204)
	at org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue
(JXPathContextReferenceImpl.java:200)
	at JXPathTestObject.main(JXPathTestObject.java:17)
Exception in thread "main" 


Expected Results:
The following written in the console
---------
value
READY.
---------

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