[Simple-support] NPE using Map

[<Jas...@sc...>]

Hi,

Really like the looks of the library, seems very neat - but I'm having a 
problem setting up. 

When I run the following:

@Root
public class TestXML<Value>
{
        @ElementMap
        Map<String, Value> map;
 
        TestXML()
        {
                map = new HashMap<String, Value>();
        }
 
        public static void main(String[] args) throws Exception
        {
                TestXML<Double> object = new TestXML<Double>();
                object.map.put("One", 1.0);
                object.map.put("Two", 2.0);

                Serializer serializer = new Persister();
                serializer.write(object, new File("test.xml"));
        }
}

I get:

Exception in thread "main" java.lang.NullPointerException
        at org.simpleframework.xml.load.Factory.isPrimitive(
Factory.java:213)
        at org.simpleframework.xml.load.Entry.getValue(Entry.java:191)
        at org.simpleframework.xml.load.CompositeMap.<init>(
CompositeMap.java:89)
        at org.simpleframework.xml.load.ElementMapLabel.getConverter(
ElementMapLabel.java:101)
        at org.simpleframework.xml.load.CacheLabel.getConverter(
CacheLabel.java:135)
        at org.simpleframework.xml.load.Composite.writeElement(
Composite.java:829)
        at org.simpleframework.xml.load.Composite.writeElements(
Composite.java:728)
        at org.simpleframework.xml.load.Composite.write(Composite.java:666
)
        at org.simpleframework.xml.load.Composite.write(Composite.java:644
)
        at org.simpleframework.xml.load.Traverser.write(Traverser.java:206
)
        at org.simpleframework.xml.load.Traverser.write(Traverser.java:183
)
        at org.simpleframework.xml.load.Traverser.write(Traverser.java:161
)
        at org.simpleframework.xml.load.Persister.write(Persister.java:769
)
        at org.simpleframework.xml.load.Persister.write(Persister.java:751
)
        at org.simpleframework.xml.load.Persister.write(Persister.java:732
)
        at org.simpleframework.xml.load.Persister.write(Persister.java:848
)
        at org.simpleframework.xml.load.Persister.write(Persister.java:830
)
        at org.simpleframework.xml.load.Persister.write(Persister.java:811
)
        at org.simpleframework.xml.load.Persister.write(Persister.java:790
)
        at TestXML.main(TestXML.java:30)

OK, so I guess it may be generics-related. It works fine if I change the 
generic Double to an explicit one. But this is a bit weird as the 
implementation of Map is itself generic?!

To confuse me even more, changing this to an explicit Map<String, Object> 
gives the following unusable file:

<testXML>
   <map class="java.util.HashMap">
      <entry>
         <string>Two</string>
         <object class="java.lang.Double"/>
      </entry>
      <entry>
         <string>One</string>
         <object class="java.lang.Double"/>
      </entry>
   </map>
</testXML>

i.e. It has lost the values of the Doubles....



Jason Chown
Sony Computer Entertainment Europe
http://www.eu.playstation.com

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