io.fabric8.kubernetes.client.KubernetesClientException: An error has occurred.

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Import the server certificate into your truststore.

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:1949)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1509)
at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
at sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
at com.squareup.okhttp.internal.io.RealConnection.connectTls(RealConnection.java:188)
at com.squareup.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:145)
at com.squareup.okhttp.internal.io.RealConnection.connect(RealConnection.java:108)
at com.squareup.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:184)
at com.squareup.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:126)
at com.squareup.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:95)
at com.squareup.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:281)
at com.squareup.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:224)
at com.squareup.okhttp.Call.getResponse(Call.java:286)
at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:243)
at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:205)
at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:210)
at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleGet(OperationSupport.java:205)
at io.fabric8.kubernetes.client.dsl.base.BaseOperation.handleGet(BaseOperation.java:510)
at io.fabric8.kubernetes.client.dsl.base.BaseOperation.get(BaseOperation.java:118)
at io.fabric8.elasticsearch.cloud.kubernetes.KubernetesAPIServiceImpl.endpoints(KubernetesAPIServiceImpl.java:35)
at io.fabric8.elasticsearch.discovery.kubernetes.KubernetesUnicastHostsProvider.readNodes(KubernetesUnicastHostsProvider.java:112)
at io.fabric8.elasticsearch.discovery.kubernetes.KubernetesUnicastHostsProvider.lambda$buildDynamicNodes$0(KubernetesUnicastHostsProvider.java:80)
at io.fabric8.elasticsearch.discovery.kubernetes.KubernetesUnicastHostsProvider.buildDynamicNodes(KubernetesUnicastHostsProvider.java:79)
at org.elasticsearch.discovery.zen.ping.unicast.UnicastZenPing.sendPings(UnicastZenPing.java:335)
at org.elasticsearch.discovery.zen.ping.unicast.UnicastZenPing.ping(UnicastZenPing.java:240)
at org.elasticsearch.discovery.zen.ping.ZenPingService.ping(ZenPingService.java:106)
at org.elasticsearch.discovery.zen.ping.ZenPingService.pingAndWait(ZenPingService.java:84)
at org.elasticsearch.discovery.zen.ZenDiscovery.findMaster(ZenDiscovery.java:945)
at org.elasticsearch.discovery.zen.ZenDiscovery.innerJoinCluster(ZenDiscovery.java:360)
at org.elasticsearch.discovery.zen.ZenDiscovery.access$4400(ZenDiscovery.java:96)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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