I have started to see the error below very regularly filling up my logs.
Doe any one have this and any ideas for a solution. seems similar to one we had not so long ago.
==> /var/log/openhab2/openhab.log <==
2018-10-26 08:56:13.463 [WARN ] [d.handler.ICloudAccountBridgeHandler] - Unable to refresh device data
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:1946) ~[?:?]
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:316) ~[?:?]
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:310) ~[?:?]
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1639) ~[?:?]
at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:223) ~[?:?]
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1037) ~[?:?]
at sun.security.ssl.Handshaker.process_record(Handshaker.java:965) ~[?:?]
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1064) ~[?:?]
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367) ~[?:?]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1395) ~[?:?]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1379) ~[?:?]
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559) ~[?:?]
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185) ~[?:?]
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334) ~[?:?]
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309) ~[?:?]
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:259) ~[?:?]
at org.openhab.binding.icloud.internal.Connection.postRequest(Connection.java:95) ~[?:?]
at org.openhab.binding.icloud.internal.Connection.requestDeviceStatusJSON(Connection.java:55) ~[?:?]
at org.openhab.binding.icloud.handler.ICloudAccountBridgeHandler.lambda$0(ICloudAccountBridgeHandler.java:81) ~[?:?]
at org.eclipse.smarthome.core.cache.ExpiringCache.refreshValue(ExpiringCache.java:81) ~[?:?]
at org.eclipse.smarthome.core.cache.ExpiringCache.getValue(ExpiringCache.java:61) ~[?:?]
at org.openhab.binding.icloud.handler.ICloudAccountBridgeHandler.refreshData(ICloudAccountBridgeHandler.java:132) ~[?:?]
at org.openhab.binding.icloud.handler.ICloudAccountBridgeHandler.lambda$1(ICloudAccountBridgeHandler.java:123) ~[?:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:?]
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [?:?]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [?:?]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
at java.lang.Thread.run(Thread.java:748) [?:?]
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:397) ~[?:?]
at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:302) ~[?:?]
at sun.security.validator.Validator.validate(Validator.java:262) ~[?:?]
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324) ~[?:?]
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229) ~[?:?]
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124) ~[?:?]
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1621) ~[?:?]
... 26 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141) ~[?:?]
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126) ~[?:?]
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280) ~[?:?]
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:392) ~[?:?]
at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:302) ~[?:?]
at sun.security.validator.Validator.validate(Validator.java:262) ~[?:?]
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324) ~[?:?]
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229) ~[?:?]
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124) ~[?:?]
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1621) ~[?:?]
... 26 more