在 Spring Boot 中使用 Lombok builder 接口返回 null

StackOverflow
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我使用 JPA 和 Lombok 开发 Spring Boot 应用。

我有一个添加了 Lombok 注解的 Author 实体。当我尝试使用 builder() 方法创建 Author 对象时，IDEA 将 builder() 方法标记为红色警告。并且在实际运行时返回 null。

JpaApplication.java 如下：

package com.explorer.jpa;

import com.explorer.jpa.models.Author;
import com.explorer.jpa.repositories.AuthorRepository;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class JpaApplication {
    public static void main(String[] args) {
        SpringApplication.run(JpaApplication.class, args);
    }

    @Bean
    public CommandLineRunner commandLineRunner(AuthorRepository repository) {
        return args -> {
            var author = Author.builder()  // 这一行在 IDDEA 中被标记为红色，即 `.builder()` 部分
                    .firstName("Johnny")
                    .lastName("Deep")
                    .age(35)
                    .email("contact@disney.com")
                    .build();

            repository.save(author);
        };
    }
}

Author.java 类如下：

package com.explorer.jpa.models;

import jakarta.persistence.*;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.time.LocalDateTime;

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
@Entity
public class Author {
    @Id
    @GeneratedValue
    private Integer id;

    @Column(name = "firstname", length = 50)
    private String firstName;

    @Column(name = "lastname")
    private String lastName;

    @Column(unique = true, nullable = false)
    private String email;

    private int age;

    @Column(updatable = false, nullable = false)
    private LocalDateTime createdAt;

    @Column(insertable = false)
    private LocalDateTime lastModified;
}

pom.xml 如下：

<?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>3.3.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.explorer</groupId>
    <artifactId>jpa</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>jpa</name>
    <description>Demo project for Spring Boot JPA</description>
    <url/>
    <licenses>
        <license/>
    </licenses>
    <developers>
        <developer/>
    </developers>
    <scm>
        <connection/>
        <developerConnection/>
        <tag/>
        <url/>
    </scm>
    <properties>
        <java.version>17</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.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

其他信息

  • Java Version：17
  • Spring Boot Version：3.3.1