Name: eaR10174 Date: 11/11/2003


  The following methods of the class javax.xml.xpath.XPathExpression
  
     public Object evaluate(InputSource source, QName returnType)
                throws XPathException
     public Object evaluate(InputSource source)
                throws XPathException
     public Object evaluate(URL documentURL, QName returnType)
                throws XPathException

throw XPathException instead of NullPointerException (see test.java below) in the
following cases:

     a) source is null; returnType is not null (method evaluate(InputSource,QName))
     b) source is not null; returnType is null (method evaluate(InputSource,QName))
     c) source is null (method evaluate(InputSource))
     d) documentURl is null (method evaluate(URL,QName))

     
According to the javadoc the methods should throw NullPointerException in such cases.

  The bug appears in jdk1.5.0beta-b26 and affects new JCK1.5 tests:
  
      api/javax_xml/xpath/XPathExpression/index.html#Evaluate[Evaluate038]
      api/javax_xml/xpath/XPathExpression/index.html#Evaluate[Evaluate039]
      api/javax_xml/xpath/XPathExpression/index.html#Evaluate[Evaluate043]
      api/javax_xml/xpath/XPathExpression/index.html#Evaluate[Evaluate048]

------------------------------------test.xml------------------------------
<?xml version="1.0"?>
<root/>
------------------------------------test.java-----------------------------
import javax.xml.namespace.QName;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathException;
import javax.xml.xpath.XPathExpression;
import org.xml.sax.InputSource;
import java.net.URL;
import java.io.File;

public class test {

    public static void main (String[] args) {
        XPathExpression expr = null;
        try {
            XPathFactory xpf = XPathFactory.newInstance(XPathConstants.DOM_OBJECT_MODEL);
            XPath xpath = xpf.newXPath();
            expr = xpath.compile("123");
        } catch (XPathException e) {
            System.err.println("Can not compile expression.");
            e.printStackTrace();
            System.exit(1);
        }
        
        try {
            System.out.println("Invoke evaluate((InputSource)null,QName).");
            expr.evaluate((InputSource)null, XPathConstants.STRING);
            System.out.println("NPE not thrown.");
        } catch (NullPointerException e) {
            System.out.println("OK: NPE");
        } catch (Exception e) {
            e.printStackTrace();
            System.err.println("");
        }

        try {
            System.out.println("Invoke evaluate(InputSource, null).");
            expr.evaluate(new InputSource("test.xml"), null);
            System.out.println("NPE not thrown.");
        } catch (NullPointerException e) {
            System.out.println("OK: NPE");
        } catch (Exception e) {
            e.printStackTrace();
            System.err.println("");
        }

        try {
            System.out.println("Invoke evaluate((InputSource)null).");
            expr.evaluate((InputSource)null);
            System.out.println("NPE not thrown.");
        } catch (NullPointerException e) {
            System.out.println("OK: NPE");
        } catch (Exception e) {
            e.printStackTrace();
            System.err.println("");
        }

        try {
            System.out.println("Invoke evaluate(URL, null).");
            expr.evaluate(new File("test.xml").toURL(), null);
            System.out.println("NPE not thrown.");
        } catch (NullPointerException e) {
            System.out.println("OK: NPE");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
--------------------------------------------------------------------------
% java -showversion test
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b26)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b26, mixed mode)

Invoke evaluate((InputSource)null,QName).
javax.xml.xpath.XPathException: java.lang.IllegalArgumentException: InputSource cannot be
null
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:205)
        at test.main(test.java:27)
Caused by: java.lang.IllegalArgumentException: InputSource cannot be null
        at
com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java
:202)
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:201)
        ... 1 more

Invoke evaluate(InputSource, null).
javax.xml.xpath.XPathException: java.lang.NullPointerException
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:205)
        at test.main(test.java:38)
Caused by: java.lang.NullPointerException
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.getResultAsType(XPathExpression
Impl.java:252)
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:115)
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:202)
        ... 1 more

Invoke evaluate((InputSource)null).
javax.xml.xpath.XPathException: java.lang.IllegalArgumentException: InputSource cannot be
null
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:205)
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:246)
        at test.main(test.java:49)
Caused by: java.lang.IllegalArgumentException: InputSource cannot be null
        at
com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java
:202)
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:201)
        ... 2 more

Invoke evaluate(URL, null).
javax.xml.xpath.XPathException: java.lang.NullPointerException
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:205)
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:164)
        at test.main(test.java:60)
Caused by: java.lang.NullPointerException
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.getResultAsType(XPathExpression
Impl.java:252)
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:115)
        at
com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.ja
va:202)
        ... 2 more
--------------------------------------------------------------------------

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