我试图从Twitter4J提供的示例集中运行一个简单的示例。我收到以下错误：
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
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TwitterException{exceptionCode=[d3c26678-99f8151f d3c26678-99f814f5 d3c26678-99f814f5 d3c26678-99f814f5], statusCode=-1, message=null, code=-1, retryAfter=-1, rateLimitStatus=null, version=4.0.1}
at twitter4j.HttpClientImpl.handleRequest(HttpClientImpl.java:179)
at twitter4j.HttpClientBase.request(HttpClientBase.java:53)
at twitter4j.HttpClientBase.post(HttpClientBase.java:82)
at twitter4j.TwitterStreamImpl.getUserStream(TwitterStreamImpl.java:246)
at twitter4j.TwitterStreamImpl$5.getStream(TwitterStreamImpl.java:218)
at twitter4j.TwitterStreamImpl$TwitterStreamConsumer.run(TwitterStreamImpl.java:533)
Caused by: 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
at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1886)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:276)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:270)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1341)
at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:153)
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:868)
at sun.security.ssl.Handshaker.process_record(Handshaker.java:804)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1016)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1312)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1339)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1323)
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:515)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1090)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250)
at twitter4j.HttpClientImpl.handleRequest(HttpClientImpl.java:137)
... 5 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 sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:385)
at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
at sun.security.validator.Validator.validate(Validator.java:260)
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:326)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:126)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1323)
... 17 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:196)
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:268)
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380)
... 23 more
onException:sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
[Tue Jun 17 05:22:47 EDT 2014]Waiting for 2000 milliseconds
[Tue Jun 17 05:22:47 EDT 2014]Twitter Stream consumer-1[Waiting for 2000 milliseconds]
我认为这是通过调用
来提出的 POST https://userstream.twitter.com/1.1/user.json
我在浏览器中输入了这个链接（firefox）和证书的确认例外，但它给了我：category_access_denied
我已将密钥库文件保存到计算机，并尝试使用以下命令列出该类型：
keytool -list -keystore userstream.twitter.com
我收到以下错误：
keytool error: java.io.IOException: Invalid keystore format
非常感谢任何帮助！