Clash Royale CLAN TAG#URR8PPP

How to deserialize Spring Boot actuator environment

I would like to deserialize the Spring Boot Environment object returned by:

http://hostname:port/actuator/env

I'm using Jackson's ObjectMapper:

ObjectMapper

private static final ObjectMapper mapper = new ObjectMapper().configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
...
ClientResponse clientResponse = resource.type(MediaType.APPLICATION_JSON).get(ClientResponse.class);
InputStream is = clientResponse.getEntityInputStream();

org.springframework.core.env.Environment e = mapper.readValue(is, org.springframework.core.env.Environment.class);


The code above fails with the following error, which makes sense:

com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of org.springframework.core.env.Environment, problem: abstract types either need to be mapped to concrete types, have custom deserializer, or be instantiated with additional type information


But I've tried all the implementations of the Environment class (AbstractEnvironment, MockEnvironment, StandardEnvironment, StandardServletEnvironment) and they all fail as well.

Environment

AbstractEnvironment

MockEnvironment

StandardEnvironment

StandardServletEnvironment

Which class should I use?

Environment

Environment

PropertySource

1 Answer
1

org.springframework.core.env.Environment is an interface. So ObjectMapper can not guess what concrete class to instantiate. You need to tell your ObjectMapper which class to use. So in your line
org.springframework.core.env.Environment e = mapper.readValue(is,org.springframework.core.env.Environment.class); You need to replace org.springframework.core.env.Environment.class with some concrete class. For example org.springframework.core.env.StandardEnvironment (depending on what kind of environment actually being returned). Otherwise de-serialize it to map:

org.springframework.core.env.Environment

ObjectMapper

ObjectMapper

org.springframework.core.env.Environment e = mapper.readValue(is,org.springframework.core.env.Environment.class);

org.springframework.core.env.Environment.class

org.springframework.core.env.StandardEnvironment

Map<String, Object> map = mapper.readValue(is,HashMap<String, Object>.class);


And then go from there

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.