考慮在您的配置中定義“com.example.transaction.manager.properties.TransacationManagerProperties”類型的 bean

Question

事務管理器應用程序

package com.example.transaction.manager;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Profile;

import com.comvia.transaction.manager.properties.TransacationManagerProperties;

@SpringBootApplication
@ComponentScan("com.example")
public class TransactionManagerApplication {
    @Autowired 
    private TransacationManagerProperties yamlFooProperties;

    
    public static void main(String[] args) {
        SpringApplication.run(TransactionManagerApplication.class, args);
        TransactionManagerApplication manager = new TransactionManagerApplication();
        manager.print();
    }
    public void  print() {
        System.out.println("yamlFooProperties :: "+yamlFooProperties.getPassword());
    }

}

事務管理器屬性

package com.example.transaction.manager.properties;

import java.util.List;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
import org.springframework.context.annotation.PropertySource;

import com.comvia.transaction.manager.properties.factory.YamlPropertySourceFactory;

import lombok.Data;


@Configuration
@PropertySource(value = "transaction_manager.yml", factory = YamlPropertySourceFactory.class)
@Profile("development")
@Data
public class TransacationManagerProperties {

    @Value("${db.userName}")
    private String userName;
    @Value("${db.password}")
    private String password;
    @Value("${list}")
    private List<String> list;


}

啟動應用程序時出錯：

***************************
APPLICATION FAILED TO START
***************************

Description:

Field yamlFooProperties in com.comvia.transaction.manager.TransactionManagerApplication required a bean of type 'com.example.transaction.manager.properties.TransacationManagerProperties' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.example.transaction.manager.properties.TransacationManagerProperties' in your configuration.

Answer 1

從您啟動應用程序的 class 中刪除 bean 的自動裝配，因為除非此代碼行SpringApplication.run(<SomeClass>.class, args)運行，否則不會注冊 bean。

用下面給出的這種方式修改：

更新了 TransactionManagerApplication class：

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

}

創建一個示例 class 實現 CommandLineRunner （這是一個接口並告訴 spring 該 bean 應該在 SpringApplication 中存在時運行。簡單來說，這將在SpringApplication.run(<SomeClass>.class, args)執行后執行。

@Component
public class TransactionManagerRunner implements CommandLineRunner {

    @Autowired 
    private TransacationManagerProperties yamlFooProperties;

    @Override
    public void run(String... args) throws Exception {
        System.out.println("yamlFooProperties :: "+yamlFooProperties.getPassword());
    }
}