无法用RestTemplate在spring中调用HTTPS服务

StackOverflow
,
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我试图访问一个托管在另一个域的安全网络服务，我在代理后面访问它，我设法从浏览器下载带有.pem扩展名的证书，然后我把它转换成.crt并使用以下命令把它导入到我的keystore。

keytool -import -alias nhs-dos-crt -keystore  "C:\Program Files\Java\jdk-15.0.1\lib\security\cacerts" -file NHS-DOS-CRT.cer

然后我从pem文件中创建了truststore和keystore，并将其添加到classpath中，但我仍然收到。

Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

这是我所尝试的。

@Bean
    RestTemplate restTemplate() throws Exception {
        HttpHost proxy = new HttpHost(proxyServerHost, proxyServerPort);
        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY,
                new UsernamePasswordCredentials(basicAuthDosUsername, basicAuthDosPassword));

        SSLContext sslContext = SSLContextBuilder.create()
                .loadKeyMaterial(ResourceUtils.getFile("classpath:truststore/keystore.jks"), "changeit".toCharArray(),
                        "changeit".toCharArray())
                .loadTrustMaterial(ResourceUtils.getFile("classpath:truststore/truststore.jks"),
                        "changeit".toCharArray())
                .build();

        // SSLConnectionSocketFactory socketFactory = new
        // SSLConnectionSocketFactory(sslContext);
        HttpClient httpClient = HttpClients.custom()
                // .setSSLSocketFactory(socketFactory)
                .setSSLContext(sslContext).setProxy(isNeedProxy ? proxy : null)
                .setDefaultCredentialsProvider(credentialsProvider).build();
        HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(httpClient);
        return new RestTemplate(factory);
    }

然后

@Autowired
    private RestTemplate restTemplate;

    ResponseEntity<String> result = restTemplate.getForEntity(callUrl, String.class);

谁能告诉我，我错过了什么或者我做错了什么？

StackOverflow：https://stackoverflow.com/questions/68185417/unable-to-call-https-service-in-spring-with-resttemplate