Spring Jersey REST: arrays with ONE element issue - json

Question

I am using spring and jersey. Problem with this combo is when trying to create a json where an objects has List and there is only one element. If there are many, json is fine. Jersey "forgot" to add brackets [] on single elems.
As you can see, even tried to force it to use jackson (as I read in many tutorials), but ... same result:
<servlet>
<servlet-name>jersey-serlvet</servlet-name>
<servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>org.codehaus.jackson.jaxrs;au.com.bikesquare.core.rest</param-value>
</init-param>
</servlet>
Then found this, and still nothing.
#Provider
#Component
#Produces ("application/json")
public class JsonJaxbResolver implements ContextResolver<JAXBContext> {
#Override
public JAXBContext getContext(Class<?> type) {
JSONConfiguration.MappedBuilder b = JSONConfiguration.mapped();
b.arrays("to");
try {
return new JSONJAXBContext(b.build(), EmailMessageTransferObject.class);
} catch (JAXBException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
Server where I am trying to send my object (that contains list) captures this:
....
"to": {
"email": "aaa#bbb.ccc",
"name": "aaa"
}
....
Supposed to be:
"to": [
{
"email": "aaa#bbb.ccc",
"name": "aaa"
}
],
My class (parts of it):
#XmlRootElement
public class EmailMessageTransferObject {
...
#XmlElement
private List<EmailRecipientTransferObject> to;
...
}
Any ideas? Tnx

Answer 1

Found the answer later:
#Provider
#Produces ("application/json")
public class JAXBContextResolver implements ContextResolver<JAXBContext> {
private JAXBContext context;
private Class<?>[] types = {SendEmailMessageTransferObject.class};
public JAXBContextResolver() throws Exception {
this.context = new JSONJAXBContext(JSONConfiguration.mapped().arrays("to").build(), types);
}
#Override
public JAXBContext getContext(Class objectType) {
for (Class type : types) {
if (type == objectType) {
return context;
}
}
return null;
}
}
Client:
public MandrillRestMailImpl() {
ClientConfig clientConfig = new DefaultClientConfig();
clientConfig.getClasses().add(JAXBContextResolver.class);
client = Client.create(clientConfig);
client.addFilter(new LoggingFilter(System.out)); //todo: remove this for prod
}