create a Resttemplate that can handle a self signed cert

createRestTemplate.java

 /**
     * note that in spring boot resource filtering must be turned OFF or file will be altered
     * https://gist.github.com/jonashackt/aae3ba2cb5595bb0f56550e604522ea6
     * https://raymondhlee.wordpress.com/2016/01/09/setup-spring-resttemplate-to-accept-self-signed-cert/
     */
    private HttpClient createHttpClient() {

        SSLConnectionSocketFactory socketFactory = null;
        try {
            
            SSLContext ctn = SSLContextBuilder
                .create()
                .loadKeyMaterial(ResourceUtils.getFile("classpath:cacerts.jks"), "changeit".toCharArray(), "changeit".toCharArray())
                .loadTrustMaterial(ResourceUtils.getFile("classpath:cacerts.jks"), "changeit".toCharArray(), new TrustSelfSignedStrategy() {
                    @Override
                    public boolean isTrusted(java.security.cert.X509Certificate[] chain, String authType) throws java.security.cert.CertificateException {
                        return true;
                    }
                })
                .build();
            
            socketFactory
                    = new SSLConnectionSocketFactory(ctn);
        } catch ( IOException | KeyManagementException | KeyStoreException |
                NoSuchAlgorithmException | UnrecoverableKeyException | CertificateException t) {
            throw new RuntimeException(t.getClass().getName() + " " + t.getMessage());
        }
        
        return HttpClients.custom().setSSLSocketFactory(socketFactory).build();
    }

    /**
     * This method gets the Rest Template with required configuration
     *
     * @return restTemplate
     */
    public RestTemplate getRestTemplate() {
        HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
        requestFactory.setHttpClient(this.createHttpClient());
        requestFactory.setConnectTimeout(Integer.parseInt(Constants.CONNECTION_TIMEOUT));
        requestFactory.setReadTimeout(Integer.parseInt(Constants.RECEIVE_TIMEOUT));
        RestTemplate restTemplate = new RestTemplate(requestFactory);
        restTemplate.setErrorHandler(new ResponseErrorHandler() {
            @Override
            public boolean hasError(ClientHttpResponse arg0) throws IOException {
                return false;
            }

            @Override
            public void handleError(ClientHttpResponse arg0) throws IOException {
                //
            }
        });

        return restTemplate;
    }