[jdom-interest] Bug in XMLOutputter or Element.addAttribute depending on whether null is valid

[Jason Hunter]

Scott M Stark wrote:
> 
> The Element class allows one to add an attribute with a null 
> value. However, when you try to output such an element with the
> XMLOutputter it crashes because it does not
> protect against attributes having null values. This is with the 
> jdom b5 release.

We need a Verifier.checkAttributeValue() call, and it should protect
against null values.  Elliotte, do you want to handle this as Verifier
master?

-jh-

> 
> bash-2.04$ cat tstOut.java
> import java.io.*;
> import org.jdom.*;
> import org.jdom.output.*;
> 
> class tstOut
> {
>         public static void main(String[] args) throws Exception
>         {
>                 Element root = new Element("ProjectInfo");
>                 root.addAttribute("name", "project1");
>                 root.addAttribute("description", null);
>                 Document doc = new Document(root);
>                 XMLOutputter output = new XMLOutputter("  ");
>                 output.output(doc, new FileOutputStream("out.xml"));
>         }
> }
> bash-2.04$ java -classpath ".;build/jdom.jar" tstOut
> Exception in thread "main" java.lang.NullPointerException
>         at org.jdom.output.XMLOutputter.escapeAttributeEntities(XMLOutputter.java:1143)
>         at org.jdom.output.XMLOutputter.printAttributes(XMLOutputter.java:1125)
>         at org.jdom.output.XMLOutputter.printElement(XMLOutputter.java:907)
>         at org.jdom.output.XMLOutputter.output(XMLOutputter.java:522)
>         at org.jdom.output.XMLOutputter.output(XMLOutputter.java:494)
>         at org.jdom.output.XMLOutputter.output(XMLOutputter.java:453)
>         at tstOut.main(tstOut.java:14)
> bash-2.04$
> 
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