Spring RestTemplate gives "500" error but same URL, credentails works in RestClient and Curl

Question

An Url, Credentials works in RestClient UI as well as with Curl where as i'm getting "500" error when access the same via Spring RestTemplate.

I am using the following code:

MultiValueMap<String, Object> map = new LinkedMultiValueMap<String, Object>();
map.add("name", user);
map.add("password", password);
restTemplate.postForObject(url, request, Employee.class, map);

Please let me know your suggestions or comments to fix the problem.

Answer 1

I would suggest to create your HttpComponentsClientHttpRequestFactory and pass it to your RestTemplate as described below:

ClientHttpRequestFactory requestFactory = new     
      HttpComponentsClientHttpRequestFactory(HttpClients.createDefault());

RestTemplate restTemplate = new RestTemplate(requestFactory);

By this way, you would avoid server-side issues (like facing error code 500) when testing your application.

I had the same issue that worked in my local environment and not on the server.

It is a good practice to pass HttpClients.createDefault() to your HttpComponentsClientHttpRequestFactory while constructing it since by default, this factory uses system properties to create HttpClient for your factory and that may cause lots of pain in real server environment. You may also pass your custom HttpClient.

Answer 2

RestTemplate header Accept problem 
--> accept - text/plain, application/json, */*

HttpClient 4.x header Accept
--> accept - application/json

so i fixed

HttpHeaders headers = new HttpHeaders();
headers.add("Accept", MediaType.APPLICATION_JSON_VALUE);

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