Java API 连接失败 : PKIX path

Question

我一直在寻找关于 的一些解决方案javax.net.ssl.SSLHandshakeException:PKIX 路径构建失败:sun.security.provider.certpath.SunCertPathBuilderException:无法找到到所请求目标的有效证书路径异常(exception)，但我阅读的帖子中提供的解决方案并没有解决问题，这就是我在这里问的原因。
基本上，在我的代码中，我使用 Unirest 进行连接，如下所示:

public void httpConnectionHourlyPred() {
   try {
      Map<String, String> asHeaders = new HashMap<String, String>();
      asHeaders.put("cache-control", "no-cache");
      asHeaders.put("api_key", getsKey());
      HttpResponse response = Unirest.get(sURLHourlyPred).headers(asHeaders).asString();
      System.out.println(response);
}

我将 AEMET 开放数据服务 ( https://opendata.aemet.es/centrodedescargas/inicio ) 连接到的 API，而 API 端点是 https://opendata.aemet.es/opendata/api/prediccion/especifica/municipio/horaria/01001 .出于安全原因，我没有包含 API-KEY，但是，如果我在浏览器中尝试 API，我会成功，如下面的快照。

python的相同脚本也可以工作，我得到了结果。但是，由于使用了只兼容 Java 的硬件，我不得不用 Java 编程。因此，当我运行脚本时，我得到了下面的异常。我正在使用 OpenJDK 虚拟机(特别是 openjdk-8u312-b07)。我该如何解决？
提前谢谢了

com.mashape.unirest.http.exceptions.UnirestException: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at com.mashape.unirest.http.HttpClientHelper.request(HttpClientHelper.java:143)
    at com.mashape.unirest.request.BaseRequest.asString(BaseRequest.java:56)
    at es.cartif.aemet.AEMETConnector.httpConnectionHourlyPred(AEMETConnector.java:55)
    at es.cartif.main.AEMETMain.main(AEMETMain.java:10)
Caused by: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:131)
    at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:369)
    at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:312)
    at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:307)
    at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:654)
    at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.onCertificate(CertificateMessage.java:473)
    at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.consume(CertificateMessage.java:369)
    at java.base/sun.security.ssl.SSLHandshake.consume(SSLHandshake.java:396)
    at java.base/sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:480)
    at java.base/sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:458)
    at java.base/sun.security.ssl.TransportContext.dispatch(TransportContext.java:199)
    at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:171)
    at java.base/sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1497)
    at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1403)
    at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:441)
    at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:412)
    at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:290)
    at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:259)
    at org.apache.http.impl.conn.HttpClientConnectionOperator.connect(HttpClientConnectionOperator.java:125)
    at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:319)
    at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:363)
    at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:219)
    at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195)
    at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:86)
    at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)
    at com.mashape.unirest.http.HttpClientHelper.request(HttpClientHelper.java:138)
    ... 3 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at java.base/sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:439)
    at java.base/sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:306)
    at java.base/sun.security.validator.Validator.validate(Validator.java:264)
    at java.base/sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
    at java.base/sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:132)
    at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:638)
    ... 28 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at java.base/sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
    at java.base/sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
    at java.base/java.security.cert.CertPathBuilder.build(CertPathBuilder.java:297)
    at java.base/sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:434)
    ... 33 more
Error making the data request javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Answer 1

看起来你没有配置 Unirest 的 ssl 配置。特定的异常(exception)可能意味着服务器不受客户端信任。您可以从以下位置提取证书:https://opendata.aemet.es/这是:

我建议将证书放入 p12 或 jks 信任库文件并从中创建一个 sslcontext。
下面是从信任库创建 sslcontext 的代码片段:

InputStream trustStoreStream = ...; // your InputStream from the trust store file

KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
trustStore.load(trustStoreStream, "password".toCharArray());

TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
trustManagerFactory.init(trustStore);

SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, trustManagerFactory.getTrustManagers(), null);

并像下面的代码片段一样配置 Unirest 的主要实例:

Unirest.primaryInstance()
    .config()
    .sslContext(sslContext)