[英]Spring Autowired Component is null in bean method
我正在尝试在@Configuration
class 中使用@Autowired
变量,其中在方法中使用@Bean
创建了一个 bean。 但是,我需要用来创建 bean 的组件是null
。
@Autowired
private JDAListener listener;
@Bean
public ShardManager shardManager() throws LoginException, IllegalArgumentException {
DefaultShardManagerBuilder builder = DefaultShardManagerBuilder.createDefault(this.botToken)
.enableIntents(GatewayIntent.GUILD_MEMBERS)
.setStatus(OnlineStatus.IDLE)
.setShardsTotal(this.totalShards)
.addEventListeners(Arrays.asList(this.listener)); //throws Exception
return builder.build();
}
我得到的异常如下:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'config':
Unsatisfied dependency expressed through field 'shardManager'; nested exception is org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'shardManager' defined in class path resource [dev/teamnight/nightbot/Config.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException:
Failed to instantiate [net.dv8tion.jda.api.sharding.ShardManager]: Circular reference involving containing bean 'config' - consider declaring the factory method as static for independence from its containing instance. Factory method 'shardManager' threw exception;
nested exception is java.lang.IllegalArgumentException: listeners may not be null
我假设代码片段是某种配置的一部分(用@Configuration
或什@SpringBootApplication
注释的东西)。
在这种情况下:
JDAListener
也由 Spring 容器管理。shardManager
方法,将JDAListener
bean 的实例注入到分片管理器中您将得到如下所示的代码:
@Configuration
public class MyConfiguration {
@Bean // now jda listener is managed by spring!
public JDAListener jdaListener() {
return new JDAListener();
}
@Bean // note the parameter to the method
public ShardManager shardManager(JDAListener jdaListener) throws LoginException, IllegalArgumentException {
DefaultShardManagerBuilder builder =
DefaultShardManagerBuilder.createDefault(this.botToken)
.enableIntents(GatewayIntent.GUILD_MEMBERS)
.setStatus(OnlineStatus.IDLE)
.setShardsTotal(this.totalShards)
.addEventListeners(Arrays.asList(jdaListener)); //throws Exception
return builder.build();
}
}
我认为您正面临此问题,因为 Spring 试图在注入侦听器之前依赖注入 bean。 您也尝试将 JdaListener 声明为 bean 怎么样?
JDAListener 是否被标记为@Component/@Service 或告诉框架它应该被视为 bean 的东西? 另外,快速检查您的组件扫描配置。
我正在尝试在@Configuration
class 中使用@Autowired
变量,其中在方法中使用@Bean
创建了一个bean。 但是,我需要创建 bean 的组件是null
。
@Autowired
private JDAListener listener;
@Bean
public ShardManager shardManager() throws LoginException, IllegalArgumentException {
DefaultShardManagerBuilder builder = DefaultShardManagerBuilder.createDefault(this.botToken)
.enableIntents(GatewayIntent.GUILD_MEMBERS)
.setStatus(OnlineStatus.IDLE)
.setShardsTotal(this.totalShards)
.addEventListeners(Arrays.asList(this.listener)); //throws Exception
return builder.build();
}
我得到的异常如下:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'config':
Unsatisfied dependency expressed through field 'shardManager'; nested exception is org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'shardManager' defined in class path resource [dev/teamnight/nightbot/Config.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException:
Failed to instantiate [net.dv8tion.jda.api.sharding.ShardManager]: Circular reference involving containing bean 'config' - consider declaring the factory method as static for independence from its containing instance. Factory method 'shardManager' threw exception;
nested exception is java.lang.IllegalArgumentException: listeners may not be null
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