Hi,
I meet a problem that has already been mentioned twice on jersey-users list :
-
http://markmail.org/thread/xhebc2jx5fnaq2ny
-
http://markmail.org/thread/enalt6uxfydkxytb
I have a resource that produces both Json and XML output from two POJO class : User and Group.
Groups contains users and vice versa.
@XmlRootElement
public class User {
protected String login;
protected String password;
protected String email;
[...]
@XmlTransient
public List<Group> getGroups() {
return groups;
}
}
@XmlRootElement
public class Group {
protected String name;
protected List<User> users;
[...]
@XmlElementWrapper(name = "users")
@XmlElement(name = "user")
public List<User> getUsers() {
return users;
}
}
I use @XmlElementWrapper annotation in order to obtain well-structured XML (in Natural notation), like this :
<group>
<name>GroupName</name>
<users>
<user>
<login>User1Login</login>
</user>
<user>
<login>User2Login</login>
</user>
</users>
</group>
But, in this case, Json output is not correct and I have problems to manipulate it.
{"name":"GroupName","users":[{"user":{"login":"User1Login"},"user":{"login":"User2Login"}}]}
So, if I comment @XmlElementWrapper and @XmlElement annotations, I obtain a good Json output, like this...
{"name":"GroupName","users":[{"login":"User1Login"},{"login":"User2Login"}]}
But my XML output is not correct :
<group>
<name>GroupName</name>
<users>
<login>User1Login</login>
</users>
<users>
<login>User2Login</login>
</users>
</group>
I try to check out and study the source code of jersey-json to see if it may possible to create a new JSONConfiguration notation. It appears that each notation use a different stream writer, which are quite complicated to manipulate.
I am currently working on RESTHub project (
http://resthub.org) and we try to do generic code, that's why this isn't possible for us to use low-level JSON support with Jackson.
So, here are my questions :
- the resemblance between XML and Json outputs suggests that the Json marshalling is made from the XML, is it true ?
- what is the easiest way to get both well-formed XML and Json output ?
- is it possible to ignore @XmlElementWrapper and @XmlElement on Json marshalling ?
This problem is a central for our project and we are ready to contribute to jersey development if necessary, we just need information on the best way to improve Json serialization in Jersey.
Thank you in advance for any information ;)
Guillaume
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