Java连接失败: PKIX路径

Question

我一直在寻找一些关于javax.net.ssl.SSLHandshakeException: PKIX路径构建失败的解决方案: sun.security.provider.certpath.SunCertPathBuilderException:无法为被请求的目标异常找到有效的认证路径，但是在我阅读的帖子中提供的解决方案并没有解决这个问题，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，如下代码所示：

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);
}

我连接(https://opendata.aemet.es/centrodedescargas/inicio)的API，而API端点是https://opendata.aemet.es/opendata/api/prediccion/especifica/municipio/horaria/01001。出于安全考虑，我不包括API键，但是，如果我在浏览器中尝试API，我成功地作为下面的快照。

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python的相同脚本也能工作，我得到了结果。但是，由于使用的硬件只与Java兼容，所以我不得不用Java编程。因此，当我运行脚本时，我获得了下面的异常。我正在使用OpenJDK虚拟机(特别是openjdk-8u312-b07)。我怎么才能修好它？

事先非常感谢

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

看起来您没有配置Unirest的ssl配置。特定的异常可能意味着客户端不信任服务器。您可以做的是从：https://opendata.aemet.es/提取证书，它是：

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我建议将证书放入p12或jks信任存储文件中，并在其中创建sslcontext。

下面是从信任库创建for上下文的代码片段：

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);

并像下面的代码段一样配置Unirest的主要实例：

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