Mapping UUID's

[Chris Roffler]

I am using Dozer to map my Hibernate entities. Everything works great, but when I turn my @Id properties in the entities into UUID's I get some strange errors.

I can't get my hands on it whats going wrong.  I am using the the following configuration:

dozer-mapper.xml

<configuration>

<custom-converters>

<converter type="rw.gov.framework.util.LocalDateTimeConverter">

<class-a>java.time.LocalDateTime</class-a>

<class-b>java.time.LocalDateTime</class-b>

</converter>

<converter type="rw.gov.framework.util.LocalDateConverter">

<class-a>java.time.LocalDate</class-a>

<class-b>java.time.LocalDate</class-b>

</converter>

<converter type="rw.gov.framework.util.UUIDConverter">

<class-a>java.util.UUID</class-a>

<class-b>java.util.UUID</class-b>

</converter>

</custom-converters>

</configuration>

and  dozer-context.xml

<bean class="org.dozer.spring.DozerBeanMapperFactoryBean" scope="singleton">

<property name="mappingFiles" value="classpath*:/dozer-mapper.xml" />

<property name="customFieldMapper" ref="dozerCustomFieldMapper"></property>

<property name="customConverters">

<list>

<bean class="rw.gov.framework.util.UUIDConverter" />

<bean class="rw.gov.framework.util.LocalDateTimeConverter" />

<bean class="rw.gov.framework.util.LocalDateConverter" /> 

</list>

</property>

<property name="eventListeners">

<list>

 

</list>

</property>

<property name="factories">

<map>

 

</map>

</property>

</bean>

 

 

<bean id="dozerCustomFieldMapper" class="rw.gov.framework.util.HibernateFieldMapper" />

</beans>

and here is the converter:

public class UUIDConverter extends DozerConverter<UUID, UUID> {

    /**

     * Instantiates a new local date converter.

     */

    public UUIDConverter() {

        super(UUID.class, UUID.class);

    }

    /* (non-Javadoc)

     * @see org.dozer.DozerConverter#convertTo(java.lang.Object, java.lang.Object)

     */

    @Override

    public UUID convertTo(final UUID source,

            final UUID destination) {

        return source;

    }

    /* (non-Javadoc)

     * @see org.dozer.DozerConverter#convertFrom(java.lang.Object, java.lang.Object)

     */

    @Override

    public UUID convertFrom(final UUID source,

            final UUID destination) {

        return source;

    }

}

When mapping entities I get the exception :

  detailMessage=java.lang.ClassCastException: rw.gov.ifmis.timeframe.domain.Period cannot be cast to java.util.UUID

  cause=java.lang.ClassCastException: rw.gov.ifmis.timeframe.domain.Period cannot be cast to java.util.UUID

 

Any hints and suggestions would be appreciated 

Chris

[i...@gmx.at]

Hi Chris,

currently I'am also exploring the functionality of dozer and had the same problem.

Just set to copy the UUID by reference:

 

<mapping type="one-way">
    <class-a>com.pmc.maventest2.dal.AAA</class-a>
    <class-b>com.pmc.maventest2.dal.BBB</class-b>
    <field copy-by-reference="true">
        <a>Uid</a>
        <b>Uid</b>
    </field>
</mapping>