I/O error on POST request for in SPRINGBOOT

Question

I have googled it with issue. But those are not able to solve my problem.I have an issue with the SSL certificate in my code while calling a rest control.

My control method is:

@CrossOrigin(origins = "http://localhost:4200")
@RequestMapping(value = "/token", method = RequestMethod.POST, produces = "application/json")
public @ResponseBody TokenModel GetToken(@RequestBody RequestBodyJson requestBodyJson) {
    TokenModel response = null; 
    RestTemplate restTemplate = new RestTemplate();
    try {                          
        response = new GenericRestClient<RequestBodyJson, TokenModel>().execute(
            new RequestDetails(url, HttpMethod.POST), requestBodyJson, responseHandler,TokenModel.class);
        restTemplate.getForEntity(url , TokenModel.class);
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }
    return response;
}

Error is:-I/O error on POST request for "https://myurl.com": sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target; nested exception is javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

can anyone can help me here?

Rest is usually supposed to work on https, but you are using http, that might be the problem i.e "https :// localhost:4200" — Aurangzeb
localhost:4200 is my frontend. So i am calling my microservice from UI. And from MS i'm trying to call another api HTTPS://WWW.myurl.com then only im getting the issue. — Pranav MS
The reason why the SSL certificate of https///myurl.com is not trusted by java can be that the CA certificate is not imported in cacerts your application is using.For some details you can refer to the followin question: How do I find out what keystore my JVM is using? — da-sha1
Get the certificate https///myurl.com is using and import it to the cacerts of your JVM. — user10871691
@EugenCovaci can you please give some reference for the same? — Pranav MS

Pranav MS Pranav MS · Accepted Answer · 2019-04-08T09:41:41

Thanks guys for your help.

I have solved the problem by

In my POM.XML i have added one dependency

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5</version>
</dependency>

Then my JAVA code is

@RequestMapping(value = "/gettokens", method = RequestMethod.POST, produces = "application/json")
public @ResponseBody ResponseEntity<TokenModel> GetTokens(@RequestBody RequestBodyJson requestBodyJson)
        throws KeyManagementException, NoSuchAlgorithmException, KeyStoreException {
    ResponseEntity<TokenModel> response = null;
    TrustStrategy acceptingTrustStrategy = (X509Certificate[] chain, String authType) -> true;
    SSLContext sslContext = org.apache.http.ssl.SSLContexts.custom()
            .loadTrustMaterial(null, acceptingTrustStrategy).build();
    SSLConnectionSocketFactory csf = new SSLConnectionSocketFactory(sslContext);
    CloseableHttpClient httpClient = HttpClients.custom()
            .setSSLSocketFactory(csf).build();
    HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
    requestFactory.setHttpClient(httpClient);
    RestTemplate restTemplate = new RestTemplate(requestFactory);       
    try {                          
        MultiValueMap<String, String> headers = new LinkedMultiValueMap<String, String>();
        Map map = new HashMap<String, String>();
        map.put("Content-Type", "application/json");
        headers.setAll(map);
        HttpEntity<?> _HttpEntityRequestBodyJson = new HttpEntity<>(requestBodyJson, headers); 
        response= restTemplate.exchange(url, HttpMethod.POST,_HttpEntityRequestBodyJson, new ParameterizedTypeReference<TokenModel>() {});  
        System.out.println(response.getBody());
    } catch (Exception e) {
        System.out.println(e.getMessage());
    }
    return response;
}

I/O error on POST request for in SPRINGBOOT

1 Answers