当hikaridatasource bean由于外部数据源问题而无法创建时，如何让app仍然运行？

spring.datasource.url=jdbc:mysql://localhost:3306/mydb
spring.datasource.username=myuser
spring.datasource.password=mypassword

spring.backup-datasource.url=jdbc:mysql://backuphost:3306/mydb
spring.backup-datasource.username=backupuser
spring.backup-datasource.password=backuppw

@Autowired
private DataSource dataSource;

@Autowired
@Qualifier("backupDataSource")  // 使用备用数据源的bean名称
private DataSource backupDataSource;

@Bean
public DataSource dataSource() {
    try {
        // 尝试创建主数据源
        return DataSourceBuilder.create().build();
    } catch (Exception e) {
        // 创建主数据源失败，返回备用数据源
        return backupDataSource;
    }
}

spring.datasource.maximum-pool-size=10
spring.datasource.connection-timeout=5000