[JXPATH-65] Allow accessor to throw exceptions

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.0 Final

Environment

Operating System: All
Platform: PC

• Bugzilla Id: 14505
• Assignee: Unassigned
• Reporter: Kenneth Petersen
• Created: 13/Nov/02 22:34
• Updated: 16/May/06 12:45
• Resolved: 16/May/06 12:45

Description

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.
---------