MyBatis does not resolve Inner class when parsing SQL Mapper Configuration handlers
Using MyBatis 3.2.8, I'm trying to map an enum type (Status) to the jdbc VARCHAR type (to can use only the enum in my entity bean). So I defined the TypeHandler UserStatusHandler
import com.sample.User.Status;
import org.apache.ibatis.type.EnumTypeHandler;
public class UserStatusHandler extends EnumTypeHandler<Status>
{
public UserStatusHandler(Class<Status> type)
{
super(type);
}
}
I correctly declared the handler in the xml config file and in the UserDao.xml (mapping the attribute Status to the VARCHAR in the resultMap ...) sample :
In the XML config file:
<typeHandlers>
<typeHandler handler="com.sample.dao.UserStatusHandler" javaType="com.sample.User.Status"/>
</typeHandlers>
In the DAO mapper XML file:
<resultMap id="UserResultMap" type="User">
<id property="id" column="ID" javaType="long"/>
<result property="status" column="STATUS" typeHandler="com.sample.dao.UserStatusHandler" javaType="com.sample.User.Status"/>
xxxxx
</resultMap>
But the problem incoming from MyBatis was that MyBatis cannot found my java enum class because it is defined inside another interface
public interface User
{
public enum Status
{
A, B, C
}
...
}
When I define this enum class in a separate file, it works with no problem, but I don't like to change my design (because of a limit ? ), I search to understand why MyBatis cannot found the class in this case ? Is it a way to fix this ?
MyBatis cannot build the SqlSession. While executing a simple test to find a User I get the following exception
Cause: org.apache.ibatis.builder.BuilderException:
Error parsing SQL Mapper Configuration. Cause:
org.apache.ibatis.builder.BuilderException: Error resolving class.
Cause: org.apache.ibatis.type.TypeException: Could not resolve type
alias 'com.sample.User.Status'.
Cause: java.lang.ClassNotFoundException: Cannot find class:
com.sample.User.Status
Answer
Finally I solved it by writing, in the XML configuration file, the name of the Inner enum like its associated compiled file name in the jar i.e. by adding a dollar $ between the enveloped and the inner class.
com.sample.User$Status
It appears a bug or a limit in MyBatis ..