异常情况:
最近在把一个项目拆分多个 module 的时候数据库查询遇到这个异常:org.hibernate.hql.internal.ast.QuerySyntaxException: Identification is not mapped
JPA 查询方法如下:
public Identification findIdentificationByWxId(String wxId) {
JPAQueryBase query = new JPAQuery(entityManager).from(qIdentification);
query.where(qIdentification.wxId.eq(wxId));
return (Identification) query.fetchOne();
}
异常信息如下:
{
"timestamp": 1548844710242,
"status": 500,
"error": "Internal Server Error",
"exception": "org.springframework.dao.InvalidDataAccessApiUsageException",
"message": "org.hibernate.hql.internal.ast.QuerySyntaxException: Identification is not mapped [select identification\nfrom Identification identification\nwhere identification.wxId = ?1];
nested exception is java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: Identification is not mapped [select identification\nfrom Identification identification\nwhere identification.wxId = ?1]",
"path": "/user/getUserInfo"
}
解决方法:
在springboot 启动类上加上如下注解便可:
@EntityScan(basePackages = ("cn.xxx.*"))
当一个项目拆分成多个 module 的时候,由于 应用层和实体层已经隔离,所以在应用层启动应用的时候需要扫描 实体。当然如果应用层需要其他 module 中的配置类的话,也是需要添加扫描配置,扫描到其他 module 中的配置类。如:
@SpringBootApplication(scanBasePackages ="cn.xxx.*")