Parse properties to Map<String, Object>

When I want to parse properties into Map, the result is not what I want

Code like :

```
JavaPropsMapper mapper = JacksonMapperHolder.getJavaPropsMapper();

Map result = mapper.readValue("level1=value1\nlevel1.level2=value2", new TypeReference>() {});
```

result is

but i think it will be

```
{"level1":"value1","level1.level2":"value2"}
```

I'm not sure if such a result is correct