GWT + Hibernate много-к-одному xml O/R Сопоставление: SerializationException

Question

В настоящее время я работаю над проектом GWT + Hibernate, который должен работать вместе над уже определенной и заполненной базой данных. Я получаю

com.google.gwt.user.client.rpc.SerializationException

когда запрос к базе данных.

Вот мои объекты ...

База данных:

-- Table: asset 
CREATE TABLE IF NOT EXISTS asset 
(
isin VARCHAR(12) NOT NULL, 
mic_code VARCHAR(4) NOT NULL DEFAULT 'n.a.', 
name VARCHAR(255) NOT NULL, 
type_id VARCHAR(36) NOT NULL, 
PRIMARY KEY (isin, mic_code), 
INDEX(isin, mic_code), 
FOREIGN KEY (type_id) REFERENCES asset_type(id) 
)ENGINE=InnoDB; 

-- Table: asset_type 
CREATE TABLE IF NOT EXISTS asset_type 
(
id VARCHAR(36) NOT NULL, 
type VARCHAR(40) NOT NULL, 
PRIMARY KEY (id) 
)ENGINE=InnoDB; 

Asset.java:

public class Asset implements Serializable { 

    private String isin; 
    private String mic_code; 
    private String name; 
    private AssetType assetType; 

    public Asset() { 
     super(); 
    } 
... 

AssetType.java

public class AssetType implements Serializable { 

    private String id; 
    private String type; 

    public AssetType() { 
    } 

и, наконец, спящий режим XML файлов: Asset.hbm.xml

<hibernate-mapping> 
    <class name="com.mygwtproject.shared.model.Asset" table="ASSET"> 
     <id name="isin" type="java.lang.String" access="field"> 
      <column name="ISIN" /> 
      <generator class="native" /> 
     </id> 
     <property name="mic_code" type="java.lang.String" access="field"> 
      <column name="MIC_CODE" /> 
     </property> 
     <property name="name" type="java.lang.String" access="field"> 
      <column name="NAME" /> 
     </property> 
     <many-to-one name="assetType" class="com.mygwtproject.shared.model.types.AssetType" column="TYPE_ID" cascade="all" not-null="true"/> 
    </class> 
</hibernate-mapping> 

AssetType.hbm.xml

<hibernate-mapping> 
    <class name="com.mygwtproject.shared.model.types.AssetType" table="ASSET_TYPE"> 
     <id name="id" type="java.lang.String" column="ID"> 
      <generator class="native" /> 
     </id> 
     <property name="type" type="java.lang.String" column ="TYPE" /> 
    </class> 
</hibernate-mapping> 

hibernate.cfg.xml

<hibernate-configuration> 
    <session-factory> 
     <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
     <property name="hibernate.connection.password">*****</property> 
     <property name="hibernate.connection.url">jdbc:mysql://localhost/asset_db</property> 
     <property name="hibernate.connection.username">root</property> 
     <property name="hibernate.current_session_context_class">thread</property> 
     <property name="hibernate.query.factory_class">org.hibernate.hql.internal.classic.ClassicQueryTranslatorFactory</property> 
     <property name="show_sql">true</property> 
     <property name="format_sql">true</property> 
     <property name="use_sql_comments">true</property> 

     <mapping resource="com/mygwtproject/shared/model/Asset.hbm.xml" /> 
     <mapping resource="com/mygwtproject/shared/model/types/AssetType.hbm.xml" /> 
    </session-factory> 
</hibernate-configuration> 

из журнала:

Hibernate: 
    select 
     assettype0_.ID as ID1_1_0_, 
     assettype0_.TYPE as TYPE2_1_0_ 
    from 
     ASSET_TYPE assettype0_ 
    where 
     assettype0_.ID=? 
09:43:09,139 TRACE BasicBinder:81 - binding parameter [1] as [VARCHAR] - [ee5bb49a-dc95-403a-9f77-864a9c342f25] 
09:43:09,142 TRACE BasicExtractor:78 - extracted value ([TYPE2_1_0_] : [VARCHAR]) - [Stock] 
Starting Jetty on port 8888 
    [WARN] Exception while dispatching incoming RPC call 
com.google.gwt.user.client.rpc.SerializationException: Type 'com.mygwtproject.shared.model.types.AssetType_$$_jvst77c_0' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = com.mygwtproject.shared.model.types.AssetType@7d617ac9 

так есть что-то не так с моим активом -> AssetType ma pping, но я не могу найти его. Любая помощь приветствуется. благодаря

редактировать:

mysql> select * from asset_type where id = 'ee5bb49a-dc95-403a-9f77-864a9c342f25'; 

возвращает

+--------------------------------------+-------+ 
| id         | type | 
+--------------------------------------+-------+ 
| ee5bb49a-dc95-403a-9f77-864a9c342f25 | Stock | 
+--------------------------------------+-------+ 
1 row in set (0.00 sec) 

Answer 1

Решение от here:

1. Создание на основе партнерства Передача данных объектов и заменить объекты Hibernate.

AssetDTO.java

public class AssetDTO implements Serializable { 

    private String isin; 
    private String mic_code; 
    private String name; 
    private AssetTypeDTO assetType; 

    public AssetDTO() { 
     super(); 
    } 

    public AssetDTO(String isin, String mic_code, String name, 
      AssetTypeDTO assetType) { 
     super(); 
     this.isin = isin; 
     this.mic_code = mic_code; 
     this.name = name; 
     this.assetType = assetType; 
    } 

//incl. Getter + Setter 
} 

AssetTypeDTO.java

public class AssetTypeDTO implements Serializable { 

    private String id; 
    private String type; 

    public AssetTypeDTO() { 
     super(); 
    } 

    public AssetTypeDTO(String id, String type) { 
     super(); 
     this.id = id; 
     this.type = type; 
    } 

    //incl. Getter + Setter 
} 

2. Добавить новый конструктор объектов в спящий режим.

Asset.java

... 
public Asset(AssetDTO dto) { 
     this.isin = dto.getIsin(); 
     this.mic_code = dto.getMic_code(); 
     this.name = dto.getName(); 
     AssetTypeDTO assetTypeDTO = dto.getAssetType(); 
     if (assetTypeDTO != null) { 
      this.assetType = new AssetType(assetTypeDTO.getId(), 
        assetTypeDTO.getType()); 
     } 
} 
... 

AssetType.Java

public AssetType(AssetTypeDTO dto) { 
     this.id = dto.getId(); 
     this.type = dto.getType(); 
    } 

3. Измените компоненты RPC GWT. Заменить объекты Hibernate в

IService.java

public List<Asset> getAssets(); 

с DTOS.

public List<AssetDTO> getAssets(); 

IServiceAsync.java

public void getAssets(AsyncCallback<List<Asset>> callback); 

с

public void getAssets(AsyncCallback<List<AssetDTO>> callback); 

4. Измените реализацию сервиса.

ServiceImpl.java

... 
@Override 
public List<AssetDTO> getAssets() { 
    ... 
    Query q = session.createQuery("from Asset"); 
    List<Asset> assets = new ArrayList<Asset>(q.list()); 
    List<AssetDTO> assetsDto = new ArrayList<AssetDTO>(); 
    if (assets != null) { 
     for (Asset asset : assets) { 
      assetsDto.add(createAssetDTO(asset)); 
     } 
    } 
    session.getTransaction().commit(); 
    return assetsDto; 
} 

public AssetDTO createAssetDTO(Asset asset) { 
    AssetTypeDTO assetTypeDto = new AssetTypeDTO(asset.getAssetType() 
       .getId(), asset.getAssetType().getType()); 
    AssetDTO result = new AssetDTO(asset.getIsin(), asset.getMicCode(), 
       asset.getName(), assetTypeDto); 
    return result; 
} 
... 

5. Переместите Hibernate объекты (актив, AssetType) в server пакет, переместите DTOs (AssetDTO, AssetTypeDTO) в shared пакет и обновления пути в ваши файлы Hibernate xml.