[xstream-dev] [jira] Closed: (XSTR-71) xstream.fromXML() requires XPP3 where xstream.toXML doesn't

Message:

   The following issue has been closed.

   Resolver: Joe Walnes
       Date: Sun, 25 Jul 2004 8:31 AM

After some discussion with users, I'm going to leave it how it is. Most users 
prefer knowing which driver is being used over XStream choosing an appropriate 
one. For example, you may intend to use XPP but due to an error in 
configuration not have the library in the path. 

So, I'm sticking with the explicit option.
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View the issue:
  http://jira.codehaus.org/browse/XSTR-71

Here is an overview of the issue:
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        Key: XSTR-71
    Summary: xstream.fromXML() requires XPP3 where xstream.toXML doesn't
       Type: Bug

     Status: Closed
   Priority: Major
 Resolution: WON'T FIX

 Original Estimate: Unknown
 Time Spent: Unknown
  Remaining: Unknown

    Project: XStream
   Versions:
             1.0

   Assignee: 
   Reporter: Jacob Kjome

    Created: Sun, 16 May 2004 3:40 AM
    Updated: Sun, 25 Jul 2004 8:31 AM

Description:
Now that the default driver for new XStream() is the XppDriver, there seems to 
be a dependency on the XPP3 library in the xstream.fromXML(String) method.  
However, according to the commit comment of XStream.java, revision 1.42, XPP3 
should still be optional...

"Default XStream constructor uses XPP3. Updated docs to recommend including 
this jar (although it is still optional)"

The dependency is apparent in the XStreamSerializationTestCase.java, revision 
1.1, in the Picocontainer CVS.
http://cvs.picocontainer.codehaus.org/java/picocontainer/src/test/org/picocontainer/defaults/XStreamSerialisationTestCase.java

In it, new XStream() is used, implicitly using the XppDriver (although an 
explicit DomDriver has been used in revision 1.2 to avoid this problem).  
Here's the error...


Testcase: 
testShouldBeAbleToSerialiseEmptyPico(org.picocontainer.defaults.XStreamSerialisationTestCase):
        Caused an ERROR
XPP3 pull parser library not present. Specify another driver. For example: new 
XStream(new DomDriver())
java.lang.IllegalArgumentException: XPP3 pull parser library not present. 
Specify another driver. For example: new XStream(new DomDriver())
        at com.thoughtworks.xstream.io.xml.XppDriver.createReader(Unknown 
Source)
        at com.thoughtworks.xstream.XStream.fromXML(Unknown Source)
        at com.thoughtworks.xstream.XStream.fromXML(Unknown Source)
        at 
org.picocontainer.defaults.XStreamSerialisationTestCase.testShouldBeAbleToSerialiseEmptyPico(XStreamSerialisationTestCase.java:20)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)


So, it looks as if the XPP3 library is required.  I would think that XStream 
would fall back to the DomDriver if XPP3 doesn't exist in the classpath.

Jake


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