MyBatis does not resolve Inner class when parsing SQL Mapper Configuration handlers - mybatis

Question

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 1

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 ..