Hi team!!
I have a java project use MyBatis and springMVC,may mappers have the
same methods,I want put them in a generic interfaces,so that other
mappers will extend that interface
this is my code:
Base.java:
public abstract Class Base{
....
}
User.java
public class User extends Base implements Serializable{
....
}
BaseMapper.java:
public interface BaseMapper<T extends Base> {
public void save(T t) throws Exception;
}
BaseMapper.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"
http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.stamp.base.persistence.BaseMapper">
</mapper>
UserMapper.java:
public interface UserMapper extends BaseMapper<User>{
}
UserMapper.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"
http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.stamp.user.persistence.UserMapper">
<insert id="save" parameterType="com.stamp.user.entity.User">
INSERT INTO tsc_user(login_name ,password) VALUES
(#{loginName},#{password})
</insert>
</mapper>
this is scan mappers in spring xml:
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.stamp.*.persistence" /
</bean>
I am sure spring xml is correct
In service I declar BaseMapper<User> baseMapper and use annotation
@Autowire injection it
when I test my project
exception is throwed :
Could not autowire field: private
com.stamp.base.persistence.BaseMapper
com.stamp.base.service.impl.BaseServiceImpl.baseMapper; nested
exception is java.lang.NullPointerException
what's with it ? I find in this link
http://groups.google.com/group/mybatis-user/browse_thread/thread/c16f...
it seems it OK!
regards.
sence.
