spring boot 2.1.1 can not read yml config to LinkedHashMap

this is my class

I've provided get and set functions. But it doesn't work.

```
@Getter
@Setter
@Configuration
@ConfigurationProperties("shiro")
public class ShiroConfiguration {
    private LinkedHashMap<String, String> filterChainDefinitions;
}

```

this is my config 

```
shiro:
  filterChainDefinitions:
    /**: origin

```

this is error message

```
Description:

Failed to bind properties under 'shiro.filter-chain-definitions' to java.util.LinkedHashMap<java.lang.String, java.lang.String>:

    Reason: No converter found capable of converting from type [java.lang.String] to type [java.util.LinkedHashMap<java.lang.String, java.lang.String>]

Action:

Update your application's configuration

```