이런 에러가 뜨는데 어떻게 해결할 수 있을까요? (unable to find valid certification path to requested target)

Question

유튜브를 찾아봐도 영어 설명에, Java 에 대한 기본 지식이 어느 정도 있어야 뭔가를 할 수 있을 것 같습니다. 회사 PC라 뭔가 회사 보안프로그램 때문인지.... 뭔지 알수가 없네요. 집 PC 에서는 뭐가 'Terminated'라 되어 안되고, Android studio 에러 때문에 Flutter 라는 놈을 과연 배워야 할지 초기 부터 절망적이네요ㅠㅠ   Launching lib\main.dart on AOSP on IA Emulator in debug mode... Running Gradle task 'assembleDebug'... Exception in thread "main" 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:371) at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:314) at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:309) 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:201) at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:172) at java.base/sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1510) at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1425) at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:455) at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:426) at java.base/sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:580) at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:187) at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1665) at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1589) at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:224) at org.gradle.wrapper.Download.downloadInternal(Download.java:58) at org.gradle.wrapper.Download.download(Download.java:44) at org.gradle.wrapper.Install$1.call(Install.java:61) at org.gradle.wrapper.Install$1.call(Install.java:48) at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65) at org.gradle.wrapper.Install.createDist(Install.java:48) at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:128) at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61) Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at java.base/sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:439) at java.base/sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:306) at java.base/sun.security.validator.Validator.validate(Validator.java:264) at java.base/sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231) at java.base/sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:132) at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:638) ... 24 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) ... 29 more Exception: Gradle task assembleDebug failed with exit code 1

오준석 · Answer

에뮬레이터 문제라면 일단 기기로 하면 잘 되니까 기기 연결해서 하시면 어떨까요. 저는 강의를 위해서 어쩔 수 없이 에뮬레이터를 쓰는 것이지 평소에는 기기로 합니다. 안드로이드: https://developer.android.com/codelabs/basic-android-kotlin-compose-connect-device?hl=ko#0 iOS: https://code-boki.tistory.com/110