OOAD project: Dormitory

Setup

Installing

拉取仓库

Configuration

本地必须先配置postgre数据库，数据库名为dormitoryDB，所属用户和密码需在application.properties编辑。

默认网页端口为8443

Run

程序入口为BackendApplication.java，位于./src/main/java/com.dormitory.backend/下

Api doc

本项目使用springdoc 2.1，运行BackendApplication.java后，访问http://localhost:8443/swagger-ui/index.html#/ 查看自动生成的api文档。

Others

Login/Register:

Register -> Profile -> Home

Login -> Home

Dormitory:

Home -> Click search dormitory module

-> find specific area till dormitory -> do operation on dormitory

Bugs

Query may raise a null pointer exception

Desciption:

If an object has a null integer attribute, when a query trying to select such object, JPA will raise a null pointer exception.

Reason:

JPA may apply Integer.parseInt() on returned attribute, but such method does not allow a null input.

Solution:

Input check: do not set a null value on int attribute.

object references an unsaved transient instance - save the transient instance before flushing

Description:

If trying to directly save an object (entity) from front-end into a table when the object has a reference attribute (foreign key), the error may be raised.

Reason:

The reference attribute is not the same as the one in database - at least the id is likely different or lost. Thus, system will assume that is a "new" attribute, and when saving an object with a "new" reference attribute not in database, the error will be triggered.

Solution:

Always retrieve the reference attribute (entity) from database by the information given by front-end, then re-assemble the object before saving it.

Notice

Subject information

At src/main/resources/subject.sql,