Spring Boot项目@Entity/@Id注解无法解析，提示javax.persistence包不存在

Hey there! Since you're new to Spring Boot, let's break down why this error is popping up and fix it step by step.

Why You're Seeing This Error #

There are two key reasons behind the "Package javax.persistence does not exist" issue:

• Spring Boot Version Shift: Starting with Spring Boot 3.x, JPA-related packages moved from javax.persistence to jakarta.persistence—this is part of the industry-wide switch from Java EE to Jakarta EE.
• Missing Core Dependency: You likely haven't added the Spring Data JPA starter to your pom.xml, which includes all the JPA annotations and underlying libraries your project needs.

Step 1: Add the Required Dependency to pom.xml #

First, make sure your pom.xml includes the Spring Data JPA starter. Drop this inside the <dependencies> section:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

Note: If you're using Spring Boot 2.x, this dependency still works, and you can keep using the javax.persistence package.

Step 2: Update Your Import Statements #

If you're on Spring Boot 3.x, replace all your javax.persistence imports with jakarta.persistence. For example:
Instead of this:

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.GeneratedValue;

Use this:

import jakarta.persistence.Entity;
import jakarta.persistence.Id;
import jakarta.persistence.GeneratedValue;

Step 3: Refresh Maven Dependencies #

After updating your pom.xml, you need to tell your IDE to pull in the new libraries:

• In IntelliJ IDEA: Right-click your project → Maven → Reload All Maven Projects
• In Eclipse: Right-click your project → Maven → Update Project...

Quick Check: Confirm Your Spring Boot Version #

To verify which version you're running, look at the spring-boot-starter-parent in your pom.xml:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>3.2.0</version> <!-- This is a 3.x version -->
    <relativePath/>
</parent>

If the version starts with 2.x, stick with javax.persistence imports and just ensure the JPA starter dependency is present.

That should clear up the "cannot resolve symbol" errors for your @Entity, @Id, and other JPA annotations!

内容的提问来源于stack exchange，提问作者afew50067