解决：Parameter 0 of constructor in xxx required a bean of type ‘xxx‘ that could not be found.

运行报错：

Parameter 0 of constructor in com.xxx.Crawler required a bean of type 'java.lang.String' that could not be found.

修复方案：
添加一个默认的无参构造器在类中，如：

public Crawler(){
    super("logs", false);
}