如何解决在springboot中找不到的bean类型的必填字段
我遇到了一个非常常见的Springboot错误,但是我无法找出原因。可能是因为我的课程是不同的模块。因此,我尝试将@ComponentScan包含在主类中,但是没有用。请问。
错误:
2020-08-18 15:16:12.543 WARN 28852 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'applicationRun': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'provRecordsProcess': Unsatisfied dependency expressed through field 'dbConfig'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.emer.payeng.config.DataSourceDbConfig' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2020-08-18 15:16:12.546 INFO 28852 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2020-08-18 15:16:12.564 INFO 28852 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-08-18 15:16:12.743 ERROR 28852 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field dbConfig in com.emer.payeng.service.ProvRecordsProcess required a bean of type 'com.emer.payeng.config.DataSourceDbConfig' that could not be found.
Action:
Consider defining a bean of type 'com.emer.payeng.config.DataSourceDbConfig' in your configuration.
我的项目结构:
src/main/java
> com.eme.payeng
> ApplicationRun.java
> com.eme.payeng.pojo
> ProvMappingPOJO.java
> com.emer.payeng.service
> ProvRecordProcess.java
> ProvRecordMapper.java
> com.emer.payeng.config
> DataSourceDbConfig.java
ApplicationRun.java:
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.emer.payeng.service.ProvRecordsProcess;
@SpringBootApplication
public class ApplicationRun {
@Autowired
static ProviderRecordsProcess provRecords;
public ApplicationRun(ProviderRecordsProcess provRecords){
ApplicationRun.provRecords = provRecords ;
}
public static void main(String[] args) {
SpringApplication.run(ApplicationRun.class,args);
provRecords.dbFetchProvRecords();
}
}
ProvRecordProcess.java
package com.emer.payeng.service;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;
import com.emer.payeng.pojo.ProvMappingPOJO;
import com.emer.payeng.config.DataSourceDbConfig;
@Component
public class ProvRecordsProcess {
@Autowired
DataSourceDbConfig dbConfig;
DataSource dataSource;
public void dbFetchProvRecords() {
dataSource = dbConfig.dataSource();
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
// code to fetch records from tables //
}
}
}
DataSourceDbConfig.java
package com.emer.payeng.config;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;
import oracle.jdbc.pool.OracleDataSource;
import java.sql.SQLException;
import javax.sql.DataSource;
@Component
@Configuration
@ConfigurationProperties("spring.datasource")
public class DataSourceDbConfig {
@Value("${spring.datasource.url}")
private String dbUrl;
@Value("${spring.datasource.username}")
private String dbUser;
@Value("${spring.datasource.secure}")
private String dbPasswrd;
@Bean
public DataSource dataSource() {
OracleDataSource dataSource = null;
try {
dataSource = new OracleDataSource();
dataSource.setUser(dbUser);
dataSource.setPassword(dbPasswrd);
dataSource.setURL(dbUrl);
} catch (SQLException e) {
e.printStackTrace();
}
return dataSource;
}
}
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