[英]can't import @Entity annotation from javax.persistence using Spring Data JPA
所以我花了幾個小時試圖解決這個問題,這真的很煩人。 I used Spring Initializr to generate a spring boot project: java 19, spring 3.0.0, maven, with mariadb driver, spring web, spring data jpa dependencies. 問題是,在我創建了一個 model class, Student 之后,我無法從 javax.persistence 導入 @Entity 注解。 我看過的所有教程和視頻都是從 javax.persistence 導入的,但我只得到了 jakarta.persistence。 為什么? 我試圖為 javax.persistency 添加自己的依賴項,但是在我創建帶有所有注釋(@Entity、@Table、@column)的 model 之后,未創建表。
這是我的文件:
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>19</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mariadb.jdbc</groupId>
<artifactId>mariadb-java-client</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
學生.class
package com.example.demo;
import jakarta.persistence.Entity;
import jakarta.persistence.Id;
@Entity(name = "student") // CAN'T GET FROM JAVAX.PERSISTENCE, SAME FOR ANNOTATIONS BELOW
public class Student {
@Id
@Column(name="id")
private int id;
@Column(name="name")
private String name;
}
application.properties 位於 src/main/resources
spring.datasource.url=jdbc:mariadb://localhost:3307/db1
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
spring.jpa.hibernate.ddl-auto=create-drop
入口點
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
我究竟做錯了什么??
在最新版本的 Spring Boot 中, javax
庫被jakarta
替換(更多詳情請參見此處https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.0.0-M1-Release-Notes ) 和這里https://spring.io/blog/2022/01/20/spring-boot-3-0-0-m1-is-now-available ,所以只能找到jakarta
沒關系。 您可以提前撥打 go 並使用它。
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