在Spring Batch中使用多个DataSource [英] Use of multiple DataSources in Spring Batch

问题描述

我正在尝试在Spring Batch中配置几个数据源。在启动时，Spring Batch抛出以下异常：

I am trying to configure a couple of datasources within Spring Batch. On startup, Spring Batch is throwing the following exception:

要使用默认的BatchConfigurer，上下文必须包含不多于一个DataSource，找到2

批量配置的片段

Snippet from Batch Configuration

@Configuration
@EnableBatchProcessing 
public class BatchJobConfiguration {

    @Primary
    @Bean(name = "baseDatasource")
    public DataSource dataSource() {
         // first datasource definition here
    }
    @Bean(name = "secondaryDataSource")
    public DataSource dataSource2() {
         // second datasource definition here
    }
    ...
}

不确定为什么我会看到这个异常，因为我已经看到一些基于xml的Spring批处理配置声明了多个数据源。我使用Spring Batch核心版本3.0.1.RELEASE与Spring Boot版本1.1.5.RELEASE。任何帮助将不胜感激。

Not sure why I am seeing this exception, because I have seen some xml based configuration for Spring batch that declare multiple datasources. I am using Spring Batch core version 3.0.1.RELEASE with Spring Boot version 1.1.5.RELEASE. Any help would be greatly appreciated.

推荐答案

AbstractBatchConfiguration 尝试查找 BatchConfigurer ，如果没有找到，则尝试自己创建它 - 这是 IllegalStateException 在多个 DataSource 容器中的bean。

AbstractBatchConfiguration tries to lookup BatchConfigurer in container first, if it is not found then tries to create it itself - this is where IllegalStateException is thrown where there is more than one DataSource bean in container.

解决问题的方法是防止创建 DefaultBatchConfigurer bean AbstractBatchConfiguration 。
要做到这一点，我们提示使用 DefaultBatchConfigurer javadoc-api / org / springframework / stereotype / Component.htmlrel =noreferrer> @Component 注释：

The approach to solving the problem is to prevent from creation the DefaultBatchConfigurer bean in AbstractBatchConfiguration. To do it we hint to create DefaultBatchConfigurer by Spring container using @Component annotation:

配置类，其中 @EnableBatchProcessing 我们可以使用 @ComponentScan 扫描包含空类的包派生自 DefaultBatchConfigurer ：

package batch_config;
...
@EnableBatchProcessing
@ComponentScan(basePackageClasses = MyBatchConfigurer.class)
public class MyBatchConfig {
    ...
}

该空派生类的完整代码在此处：

the full code of that empty derived class is here:

package batch_config.components;
import org.springframework.batch.core.configuration.annotation.DefaultBatchConfigurer;
import org.springframework.stereotype.Component;
@Component
public class MyBatchConfigurer extends DefaultBatchConfigurer {
}

在此配置中， @Primary 注释适用于 DataSource bean，如下例所示：

In this configuration the @Primary annotation works for DataSource bean as in the example below:

@Configuration
public class BatchTestDatabaseConfig {
    @Bean
    @Primary
    public DataSource dataSource()
    {
        return .........;
    }
}

这适用于Spring Batch版本3.0.3.RELEASE

This works for the Spring Batch version 3.0.3.RELEASE

最简单的解决方案 @Primary DataSource 上的注释工作可能只是添加 @ComponentScan（basePackageClasses = DefaultBatchConfigurer.class）以及 @EnableBatchProcessing 注释：

The simplest solution to make @Primary annotation on DataSource work might be just adding @ComponentScan(basePackageClasses = DefaultBatchConfigurer.class) along with @EnableBatchProcessing annotation:

@Configuration
@EnableBatchProcessing
@ComponentScan(basePackageClasses = DefaultBatchConfigurer.class)
public class MyBatchConfig {

这篇关于在Spring Batch中使用多个DataSource的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！