3

I have really strange behavior of ModelMapper framework combined with Spring and Hibernate 4. And after 2 days of searching through SO I still a little bit confused and can't figure out the reason of such strange behavior.

I have 3 classes: class A, class B and User class.

User class:

@Entity
@Table(name = "users")
@Data
@EqualsAndHashCode(of = "id")
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class User implements UserDetails {
    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid", strategy = "uuid2")
    private String id;

...
}

Class B:

@Entity
@Audited
@Table
@Data
@Builder
@EqualsAndHashCode(of = "id")
@AllArgsConstructor
@NoArgsConstructor
public class B implements Serializable{

    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid", strategy = "uuid2")
    private String id;

...

    @Audited(targetAuditMode = RelationTargetAuditMode.NOT_AUDITED)
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "user_id")
    private User user;

    @ManyToMany(fetch = FetchType.EAGER)
    @JoinTable(/*some join definition*/)
    private Set<A> a;
}

Class A:

@Entity
@Audited
@Table
@Data
@Builder
@EqualsAndHashCode(of = "id")
@AllArgsConstructor
@NoArgsConstructor
public class A implements Serializable{
    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid", strategy = "uuid2")
    private String id;

    ...
    @Audited(targetAuditMode = RelationTargetAuditMode.NOT_AUDITED)
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "user_id")
    private User user;

    @Audited(targetAuditMode = RelationTargetAuditMode.NOT_AUDITED)
    @ManyToMany(fetch = FetchType.EAGER)
    @JoinTable(/*some join definition*/)
    private Set<User> subscribers;
}

In my controller I have below code:

List<B> bObjects = bService.findAll();
return modelMapper.map(bObjects, new TypeToken<List<BDto>>() {
}.getType());

And the problem is in first run query after database was dropped and recreated. I drop database and run my application, and add new objects of A and B class. And then, when I try to list all objects that are in my table, ModelMapper returns null in place of User class object. Every first run it returns null. When I restart application users are mapped properly. Moreover, when I use UserController to return all users, all users returned corectly and al properties are properly mapped. More itnerresting, that objects of class B contain relationship of class A and these object of class A are returned properly even in first run of Application.

These entities are loaded Eagerly, so hibernate must load it. When I use standard converter to convert A to ADto everything works fine. Converter contains hardcoded line: 

aDtoObject.setUserDto(aObject.getUser());

I insert default users in my ApplicationStartUp class.

My hibernate config properties:

hibernate.dialect=org.hibernate.dialect.PostgreSQL9Dialect
hibernate.showSql=false
hibernate.formatSql=false
hibernate.hbm2ddl.auto=update
hibernate.jdbc.batchSize=100
hibernate.orderInserts=true
hibernate.orderUpdates=true
hibernate.jdbc.batchVersionedData=true
hibernate.ejb.event.post-insert = org.hibernate.ejb.event.EJB3PostInsertEventListener,org.hibernate.envers.event.AuditEventListener
hibernate.ejb.event.post-update = org.hibernate.ejb.event.EJB3PostUpdateEventListener,org.hibernate.envers.event.AuditEventListener
hibernate.ejb.event.post-delete = org.hibernate.ejb.event.EJB3PostDeleteEventListener,org.hibernate.envers.event.AuditEventListener
hibernate.ejb.event.pre-collection-update = org.hibernate.envers.event.AuditEventListener
hibernate.ejb.event.pre-collection-remove = org.hibernate.envers.event.AuditEventListener
hibernate.ejb.event.post-collection-recreate = org.hibernate.envers.event.AuditEventListener

ModelMapper config:

@Configuration
public class ModelMapperConfig {

    @Bean
    public ModelMapper strictModelMapper() {
        ModelMapper modelMapper = new ModelMapper();
        modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.STANDARD);
        return modelMapper;
    }
}

POM:

        <spring-version>4.2.4.RELEASE</spring-version>
        <hibernate-version>4.3.8.Final</hibernate-version>

    <dependency>
        <groupId>org.modelmapper</groupId>
        <artifactId>modelmapper</artifactId>
        <version>0.7.5</version>
    </dependency>


    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>${hibernate-version}</version>
    </dependency>


    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-envers</artifactId>
        <version>${hibernate-version}</version>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>${hibernate-version}</version>
    </dependency>

Can anybody help me to figure it out? Any ideas what can I check and what can be a reason to such strange behavior?

P.S. whant to udnerline just with User class. Other classes are working fine.

4

1 回答 1

0

您还需要向模型映射器添加映射，以防您在配置类中没有这样做 -

modelMapper.addMappings(new OutputMapper());

您在定义模型映射器时正在检索配置，但考虑覆盖 PropertyMap 的 configure() 方法以单独映射您的属性：

class OutputMapper extends PropertyMap<AData, Output> {

   @Override
   protected void configure(){

     map().setABCD(source.getABCD());

   }
}
于 2017-03-09T07:18:53.463 回答