typeAliases

A type alias is simply a shorter name for a Java type. It’s only relevant to the XML configuration and simply exists to reduce redundant typing of fully qualified classnames. For example:

<typeAliases>
  <typeAlias alias="Author" type="domain.blog.Author"/>
  <typeAlias alias="Blog" type="domain.blog.Blog"/>
  <typeAlias alias="Comment" type="domain.blog.Comment"/>
  <typeAlias alias="Post" type="domain.blog.Post"/>
  <typeAlias alias="Section" type="domain.blog.Section"/>
  <typeAlias alias="Tag" type="domain.blog.Tag"/>
</typeAliases>

With this configuration, Blog can now be used anywhere that domain.blog.Blog could be.

You can also specify a package where MyBatis will search for beans. For example:

<typeAliases>
  <package name="domain.blog"/>
</typeAliases>

Each bean found in domain.blog , if no annotation is found, will be registered as an alias using uncapitalized non-qualified class name of the bean. That is domain.blog.Author will be registered as author. If the @Alias annotation is found its value will be used as an alias. See the example below:

@Alias("author")
public class Author {
    ...
}

There are many built-in type aliases for common Java types. They are all case insensitive, note the special handling of primitives due to the overloaded names.