@XmlInverseReference - invalid token in json in a

I have cyclic issues with a 2 way JPA relationship using Jersey. I am trying to solve the cyclic dependency with @XmlElement and @XmlInverseReference, and while getting closer - my json wont parse as it seems to be introducing an invalid "close bracket".

My entities look as below:

@Entity(name = "PR_GPT")
@Table
@XmlRootElement
@PersistenceUnit(unitName = "graps-jpa")
public class PrGPT {

    @ManyToOne(optional=false)  
    @JoinColumn(name="THERAPY_AREA")    
    @XmlInverseReference(mappedBy="gpts")
    @XmlElement
    protected PrTherapyArea therapyArea;



@Entity(name = "PR_THERAPY_AREA")
@Table
@XmlRootElement
@PersistenceUnit(unitName = "graps-jpa")
public class PrTherapyArea {



@OneToMany(mappedBy="therapyArea", orphanRemoval = true, cascade = { javax.persistence.CascadeType.PERSIST, javax.persistence.CascadeType.MERGE }, fetch = FetchType.EAGER)
    protected List<PrGPT> gpts;

And my json output which is failing to be parsed on the client is as below:

[{"therapyArea":{"id":[1},"gptDesc":"GPT 12345678912132ddd","id":1},{"therapyArea":{"id":[4},"gptDesc":"GPT 291","id":2}]

You can see here:

"therapyArea":{"id":[1}

There is a rogue "[" in front of the therapy area ID....

I am using EclipseLink.

Update: Error is:

SyntaxError: Unexpected token }
    at Object.parse (native)
    at fromJson (http://mydomain:8080/misf-web/lib/angular/angular.js:1139:14)
    at $HttpProvider.defaults.defaults.transformResponse (http://mydomain:8080/misf-web/lib/angular/angular.js:7481:18)
    at http://mydomain:8080/misf-web/lib/angular/angular.js:7429:12
    at forEach (http://mydomain:8080/misf-web/lib/angular/angular.js:325:18)
    at transformData (http://mydomain:8080/misf-web/lib/angular/angular.js:7428:3)
    at transformResponse (http://mydomain:8080/misf-web/lib/angular/angular.js:8122:17)
    at wrappedCallback (http://mydomain:8080/misf-web/lib/angular/angular.js:11561:81)
    at http://mydomain:8080/misf-web/lib/angular/angular.js:11647:26
    at Scope.$eval (http://mydomain:8080/misf-web/lib/angular/angular.js:12673:28)

UPDATE:

XML representation is fine, only breaks for JSON...is this a bug?

JSON:

[{"id":1,"gptDesc":"GPT 12345678912132ddd","therapyArea":{"id":[1,"Oncology"}},{"id":2,"gptDesc":"GPT 291","therapyArea":{"id":[4,"RI"}}]

XML

<prGPTs>
<prGPT>
<id>1</id>
<gptDesc>GPT 12345678912132ddd</gptDesc>
<therapyArea>
<id>1</id>
<therapyArea>Oncology</therapyArea>
</therapyArea>
</prGPT>
<prGPT>
<id>2</id>
<gptDesc>GPT 291</gptDesc>
<therapyArea>
<id>4</id>
<therapyArea>RI</therapyArea>
</therapyArea>
</prGPT>
</prGPTs>

Regards