Unable to use Jaxb2Marshaller with an XmlAdapter

[Proner]

Hi,

I'm facing the following problem (not related to WS directly, but I post here because of the JAXB component) :
I want to Marshall a org.springframework.social.twitter.api.Tweet to xml. But this object does not have a no-arg constructor as the Jaxb2Marshaller says

Caused by: com.sun.xml.internal.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
org.springframework.social.twitter.api.Tweet does not have a no-arg default constructor.
	this problem is related to the following location:
		at org.springframework.social.twitter.api.Tweet

So I create a SimpleTweet class that simply propose the same get/set but with a default constructor.
Then I create a TweetAdapter to link those two classes.

Next, I change my Jaxb2Manager configuration like this.

<bean id="marshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
        <property name="classesToBeBound">
            <list>
                <value>org.springframework.social.twitter.api.Tweet</value>
            </list>
        </property>
        <property name="adapters">
            <list>
                <bean class="test.TweetAdapter" />
            </list>
        </property>
    </bean>

But I still get the same error message. Do I forget something ?
Note that I can't modify the original Tweet class to add an Annotation.

Thanks in advance