Passing date as json object through Spring Hibernate

I am using Spring Hibernate framework. And I have a problem in passing date as json object. Whenever I try to insert an object, it says error 400, request syntactically incorrect.

My controller class

    @RequestMapping(value="/hospital", method= RequestMethod.POST,
consumes=MediaType.APPLICATION_JSON_VALUE,produces=MediaType.APPLICATION_JSON_VALUE)

public @ResponseBody Status addHospitalInfo(@RequestBody HospitalInformation hospitalInformation){   

try{
    if(hospitalService.addHospitalInfo(hospitalInformation)){

        return new Status(1,"Success");

    }else{
        return new Status(0,"Failed");
    }

}catch(Exception e){
    e.printStackTrace();
    return new Status(0,e.getMessage());
}   
}

My domain class is

private Integer hospitalId;
private String shortName;
private String name;
private Integer packageId;
private Date implementationDate;
private Date validFrom;
private Date validUpTo;
public enum SubscriptionType{Free,Complimentary,Paid}
private Integer totalUsers;
private Package packages;

public enum Status{Active,Inactive}

private SubscriptionType subscriptionType;
private Status status;
//normal getters and setters for other fields

@Column(name = "implementation_date",
            nullable = false)
    public Date getImplementationDate() {
        return implementationDate;
    }
    public void setImplementationDate(Date implementationDate)
    {
        this.implementationDate = implementationDate;
            }

    @Column(name = "valid_from",
            nullable = false)
    public Date getValidFrom() {
        return validFrom;
    }
    public void setValidFrom(Date validFrom) 
    {
        this.validFrom =validFrom;
    }


    @Column(name = "valid_upto",
            nullable = false)
    public Date getValidUpTo() {
        return validUpTo;
    }
    public void setValidUpTo(Date validUpTo) 
    {
        this.validUpTo =validUpTo;
    }

My Dao is

@Transactional
public boolean addHospitalInfo(HospitalInformation hospitalInformation)
        throws Exception {
    Session session=sessionFactory.openSession();
    Transaction tx=session.beginTransaction();
    if(findByPackageId(hospitalInformation.getPackageId())== null){
        return false;
    }
    else{
        session.save(hospitalInformation);
        tx.commit();
        session.close();
        return true;
    }

}

@Transactional
public Package findByPackageId(Integer packageId) throws Exception {
    Session session=sessionFactory.openSession();
    Transaction tx= session.beginTransaction();

    List<Package> package1= new ArrayList<Package>();
    package1=session
            .createQuery("from Package where packageId=?")
            .setParameter(0, packageId)
            .list();
     if (package1.size() > 0) {
         return package1.get(0);
     } else {
         return null;
     }  
}

And my service class just saves the object into database. So I need help on how to pass date as json object. Thankyou in advance.