Morphia在MongoDB中插入多个嵌入数据

Question

想要使用Morphia在mongoDB中插入多个嵌入式。我想插入这样的数据：

{“_ id”：ObjectId（“55f67a57128699b6e5eab719”），“className”：“com.emecpoc.entity.User”，“smeId”：“SME1”，“creator”：“admin@souvik.emec.co。在“，”dateOfUsage“ ：“2015-06-29”， “UsageDetail”：[{“timeOfUsage”：“11：52：49.0”，“usageType”：“Storage Consumed”，“length”：“81326”}， {“timeOfUsage”：“12：12：55.0”，“usageType”：“Storage Consumed”，“length”：“115593”}， {“timeOfUsage”：“12：12：55.0”，“usageType”：“已使用存储空间”，“长度”：“5383663”}， {“timeOfUsage”：“11：52：49.0”，“usageType”：“已消耗存储空间”，“长度”：“46310”}] }

豆是这样的：

 @Entity("User")
    public class User {
        @Id
        ObjectId id;
        String smeId,creator,dateOfUsage;
        Timestamp created;
    @Embedded("UsageDetail")
        //List<UsageDetail> usageDetail;
        UsageDetail usageDetail;
//getter and setter methods
}

这是嵌入式bean类：

 public class UsageDetail {
      private String timeOfUsage;
      private String usageType;
      private String length;
    //getter and setter methods
    }

但我得到的结果如下：

    { "_id" : ObjectId("55f67a57128699b6e5eab71c"), "className" : "com.emecpoc.entity.User", "smeId" : "SME1", "creator" : "admin@souvik.emec.co.in", "dateOfUsage"
    : "2015-06-29", "UsageDetail" : { "timeOfUsage" : "11:52:49.0", "usageType" : "Storage Consumed", "length" : "46310" } }

If I remove @Id from User bean then results 4 data entry like this:
{ "_id" : ObjectId("55f67a57128699b6e5eab719"), "className" : "com.emecpoc.entity.User", "smeId" : "SME1", "creator" : "admin@souvik.emec.co.in", "dateOfUsage"
: "2015-06-29", "UsageDetail" : { "timeOfUsage" : "11:52:49.0", "usageType" : "Storage Consumed", "length" : "81326" } }

{ "_id" : ObjectId("55f67a57128699b6e5eab71a"), "className" : "com.emecpoc.entity.User", "smeId" : "SME1", "creator" : "admin@souvik.emec.co.in", "dateOfUsage"
: "2015-06-29", "UsageDetail" : { "timeOfUsage" : "12:12:55.0", "usageType" : "Storage Consumed", "length" : "115593" } }

{ "_id" : ObjectId("55f67a57128699b6e5eab71b"), "className" : "com.emecpoc.entity.User", "smeId" : "SME1", "creator" : "admin@souvik.emec.co.in", "dateOfUsage"
: "2015-06-29", "UsageDetail" : { "timeOfUsage" : "12:12:55.0", "usageType" : "Storage Consumed", "length" : "5383663" } }

{ "_id" : ObjectId("55f67a57128699b6e5eab71c"), "className" : "com.emecpoc.entity.User", "smeId" : "SME1", "creator" : "admin@souvik.emec.co.in", "dateOfUsage"
: "2015-06-29", "UsageDetail" : { "timeOfUsage" : "11:52:49.0", "usageType" : "Storage Consumed", "length" : "46310" } }

因此，请指导我如何在嵌入式部件中插入多个数据。