CODEWITHSUNDEEP
javaspring
Baljinder Singh
Baljinder Singh

Reputation: 79

Not getting Response Body from resttemplate.exchange while getting from postman Spring Mvc

I am new to Spring MVC, I am using below code to get response from another application. 4.3.20.RELEASE

ResponseEntity<OtdsOauthToken> response = restTemplate.exchange(builder.toUriString(), HttpMethod.POST, entity, OtdsOauthToken.class); // Getting response object body as null, header is coming and Status is 200

Response body through Code :

enter image description here

Response body through Postman :

enter image description here

Upvotes: 1

Views: 3238

Answers (2)

Ilya Lysenko
Ilya Lysenko

Reputation: 1892

Because you haven't yet shown the OtdsOauthToken class, for now I can only guess. I think the problem may be because of you haven't set JSON-attribute names (with snack-case) for the fields or/and may be the class doesn't contain getters/setters. So, the class must look like this:

public class OtdsOauthToken {
    @JsonProperty("access_token")
    private String accessToken;

    private LocalDateTime expiration;

    @JsonProperty("expires_in")
    private Long expiresIn;

    @JsonProperty("token_type")
    private TokenType tokenType;

    public String getAccessToken() {
        return accessToken;
    }

    public void setAccessToken(String accessToken) {
        this.accessToken = accessToken;
    }

    public LocalDateTime getExpiration() {
        return expiration;
    }

    public void setExpiration(LocalDateTime expiration) {
        this.expiration = expiration;
    }

    public Long getExpiresIn() {
        return expiresIn;
    }

    public void setExpiresIn(Long expiresIn) {
        this.expiresIn = expiresIn;
    }

    public TokenType getTokenType() {
        return tokenType;
    }

    public void setTokenType(TokenType tokenType) {
        this.tokenType = tokenType;
    }
}

Also you can configure your ObjectMapper and omit setting of attribute names. 

this.objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);

In this case the class might look as simple POJO-class:

public class OtdsOauthToken {
    private String accessToken;
    private LocalDateTime expiration;
    private Long expiresIn;
    private TokenType tokenType;

    //getters ...
    //setters ...
}

Upvotes: 2

Alexandru Somai
Alexandru Somai

Reputation: 1405

From what I see in the debug code, your OtdsOauthToken class seems to have the field names as camelCase, while your response entity (in Postman) uses snake_case. That's why the RestTemplate doesn't know to set the values on your object.

The solution would be to annotate your fields with @JsonProperty, for example:

public class OtdsOauthToken {

    @JsonProperty("access_token")
    private String accessToken

    @JsonProperty("token_type")
    private String tokenType

    @JsonProperty("expires_in")
    private Integer expiresIn;

}

Upvotes: 1

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