[GROOVY-2126] ClassCastException when using java.util.prefs package

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0
• Fix Version/s: 1.1-rc-1
• Component/s: XML Processing
• Environment: tested on Mac OS X 10.4.10 with java version 1.5.0_07 and Fedora Core 5 (2.6.20-1.2320.fc5smp) with java version: 1.5.0_11
• Assignee: Paul King
• Reporter: Matt Kennedy
• Created: 18/Sep/07 18:07
• Updated: 29/Sep/07 17:41
• Resolved: 29/Sep/07 17:41

Description

The following code throws a java.lang.ClassCastException when run as a Groovy script, the same code compiled with groovyc and executed with java runs correctly.

#prefsTest.groovy
import java.util.prefs.*;
def prefs = Preferences.userNodeForPackage(this.getClass());
prefs.exportSubtree(System.out);
#end prefsTest.groovy

Test using the following:
$ groovy prefsTest.groovy
Caught: java.lang.ClassCastException: org.apache.xerces.jaxp.DocumentBuilderFactoryImpl
at prefsTest.run(prefsTest.groovy:4)
at prefsTest.main(prefsTest.groovy)
$groovyc prefsTest.groovy
$java -cp .:$GROOVY_HOME/embeddable/groovy-all-1.0.jar prefsTest
WARNING: Prefs file removed in background /home/mkennedy/.java/.userPrefs/<unnamed>/prefs.xml
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE preferences SYSTEM "http://java.sun.com/dtd/preferences.dtd">
<preferences EXTERNAL_XML_VERSION="1.0"><root type="user"><map/><node name="<unnamed>"><map/></node></root></preferences>

I'm not sure what causes this, I discovered it when converting some java code to Groovy that imports an xml preferences file and I reduced the case to this to reproduce the behavior in a clean environment.

I apologize for the trouble if this is some stupid error on my part that I'm just not seeing my way around.