Spring Batch迁移至Spring Boot3后出现NoSuchBeanDefinitionException无数据源报错求助

核心原因 #

Spring Boot 3 中，Spring Batch 自动配置默认要求存在dataSource Bean，用于存储作业元数据。若应用无需数据库，需显式调整配置来规避这一要求。

方案1：完全禁用Spring Batch自动配置 #

在启动类上添加注解排除Batch自动配置类，这种方式会完全禁用Spring Boot对Batch的自动配置，需手动配置所有Batch核心组件（如JobLauncher、JobRepository等）：

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

方案2：配置内存型元数据存储（推荐） #

保留Spring Batch自动配置的便利，同时使用内存实现替代数据库存储元数据，无需实际数据库连接：

1. 创建配置类定义内存版的JobRepository、JobExplorer和JobLauncher：

import org.springframework.batch.core.repository.JobRepository;
import org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean;
import org.springframework.batch.core.explore.JobExplorer;
import org.springframework.batch.core.explore.support.MapJobExplorerFactoryBean;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.batch.core.launch.support.SimpleJobLauncher;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.task.SimpleAsyncTaskExecutor;

@Configuration
public class BatchInMemoryConfig {

    @Bean
    public JobRepository jobRepository() throws Exception {
        MapJobRepositoryFactoryBean factory = new MapJobRepositoryFactoryBean();
        factory.afterPropertiesSet();
        return factory.getObject();
    }

    @Bean
    public JobExplorer jobExplorer() throws Exception {
        MapJobExplorerFactoryBean factory = new MapJobExplorerFactoryBean(jobRepository());
        factory.afterPropertiesSet();
        return factory.getObject();
    }

    @Bean
    public JobLauncher jobLauncher(JobRepository jobRepository) throws Exception {
        SimpleJobLauncher launcher = new SimpleJobLauncher();
        launcher.setJobRepository(jobRepository);
        launcher.setTaskExecutor(new SimpleAsyncTaskExecutor());
        launcher.afterPropertiesSet();
        return launcher;
    }
}

2. 在配置文件中禁用数据源自动配置：

spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration

方案3：使用嵌入式内存数据库 #

若可接受临时内存存储，添加H2嵌入式数据库依赖，Spring Boot会自动配置数据源，元数据存储在内存中，应用重启后数据丢失：
Maven依赖：

<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <scope>runtime</scope>
</dependency>

Gradle依赖：

runtimeOnly 'com.h2database:h2'

内容的提问来源于stack exchange，提问作者Ashish Garg