[Simple-support] Transform exception on enum in ElementMap

[Greg C. <gre...@qu...>]

Hi Niall,

I am using Simple XML 2.0.4 with Java 1.6.0_04 in a Windows XP environment.

I have a test program:

package test;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import org.simpleframework.xml.ElementMap;
import org.simpleframework.xml.Root;
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

public enum Example
{
  CAT,
  DOG,
  FERRET;

  public static void main( String[] args )
  {
    try
    {
      TestExample test = new TestExample();
      for ( Example x : Example.values() )
        test.add( x );

      File file = new File( "example.xml" );
      Serializer s = new Persister();
      s.write( test, file );

      test = s.read( TestExample.class, file );
    }
    catch( Exception e )
    {
      e.printStackTrace();
    }
  }
}

@Root
class TestExample
{
  @ElementMap( keyType = String.class, valueType = Object.class )
  public Map<String,Object> objectMap = new HashMap<String,Object>();

  @ElementMap( keyType = String.class, valueType = Example.class )
  public Map<String,Example> enumMap = new HashMap<String,Example>();

  public void add( Example x )
  {
    objectMap.put( x.name(), x );
    enumMap.put( x.name(), x );
  }
}

That generates this XML:

<testExample>
   <objectMap class="java.util.HashMap">
      <entry>
         <string>CAT</string>
         <object class="test.Example">CAT</object>
      </entry>
      <entry>
         <string>FERRET</string>
         <object class="test.Example">FERRET</object>
      </entry>
      <entry>
         <string>DOG</string>
         <object class="test.Example">DOG</object>
      </entry>
   </objectMap>
   <enumMap class="java.util.HashMap">
      <entry>
         <string>CAT</string>
         <example>CAT</example>
      </entry>
      <entry>
         <string>FERRET</string>
         <example>FERRET</example>
      </entry>
      <entry>
         <string>DOG</string>
         <example>DOG</example>
      </entry>
   </enumMap>
</testExample>

The problem is that while both map elements can be serialised, only the enumMap element can be deserialised.  The objectMap element will throw this TransformException:

org.simpleframework.xml.transform.TransformException: Transform of class com.kaiz.darms.configuration.Example not supported
        at org.simpleframework.xml.transform.Transformer.read(Transformer.java:104)
        at org.simpleframework.xml.core.Support.read(Support.java:176)
        at org.simpleframework.xml.core.PrimitiveFactory.getInstance(PrimitiveFactory.java:110)
        at org.simpleframework.xml.core.Primitive.readTemplate(Primitive.java:225)
        at org.simpleframework.xml.core.Primitive.read(Primitive.java:166)
        at org.simpleframework.xml.core.Composite.readPrimitive(Composite.java:178)
        at org.simpleframework.xml.core.Composite.read(Composite.java:133)
        at org.simpleframework.xml.core.Traverser.read(Traverser.java:78)
        at org.simpleframework.xml.core.CompositeValue.read(CompositeValue.java:102)
        at org.simpleframework.xml.core.CompositeMap.populate(CompositeMap.java:177)
        at org.simpleframework.xml.core.CompositeMap.read(CompositeMap.java:148)
        at org.simpleframework.xml.core.Composite.readObject(Composite.java:517)
        at org.simpleframework.xml.core.Composite.read(Composite.java:477)
        at org.simpleframework.xml.core.Composite.readElement(Composite.java:458)
        at org.simpleframework.xml.core.Composite.readElements(Composite.java:374)
        at org.simpleframework.xml.core.Composite.read(Composite.java:259)
        at org.simpleframework.xml.core.Composite.read(Composite.java:204)
        at org.simpleframework.xml.core.Composite.read(Composite.java:158)
        at org.simpleframework.xml.core.Composite.read(Composite.java:135)
        at org.simpleframework.xml.core.Traverser.read(Traverser.java:78)
        at org.simpleframework.xml.core.Persister.read(Persister.java:544)
        at org.simpleframework.xml.core.Persister.read(Persister.java:526)
        at org.simpleframework.xml.core.Persister.read(Persister.java:507)
        at org.simpleframework.xml.core.Persister.read(Persister.java:489)
        at org.simpleframework.xml.core.Persister.read(Persister.java:471)
        at org.simpleframework.xml.core.Persister.read(Persister.java:452)
        at org.simpleframework.xml.core.Persister.read(Persister.java:431)
        at com.kaiz.darms.configuration.Example.main(Example.java:30)

I did try adding a @Root annotation to the Example class.  This stopped Simple throwing an exception but the deserialised objectMap had null for each value.

Cheers,
Greg.

Greg Cottman
Tel: +61 419 535 485
mailto:Gre...@qu...