C:\localhost\Minecraft\1.20.4>java -Xms6G -Xmx6G -jar paper.jar nogui
Downloading mojang_1.20.4.jar
Failed to download mojang_1.20.4.jar
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:130)
        at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:378)
        at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:321)
        at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:316)
        at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:647)
        at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.onCertificate(CertificateMessage.java:467)
        at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.consume(CertificateMessage.java:363)
        at java.base/sun.security.ssl.SSLHandshake.consume(SSLHandshake.java:393)
        at java.base/sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:476)
        at java.base/sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:447)
        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:1506)
        at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1421)
        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:586)
        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:1675)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1599)
        at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:223)
        at java.base/java.net.URL.openStream(URL.java:1325)
        at io.papermc.paperclip.DownloadContext.download(DownloadContext.java:55)
        at io.papermc.paperclip.Paperclip.setupClasspath(Paperclip.java:63)
        at io.papermc.paperclip.Paperclip.main(Paperclip.java:28)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at io.papermc.paperclip.Main.main(Main.java:26)
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:388)
        at java.base/sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:271)
        at java.base/sun.security.validator.Validator.validate(Validator.java:256)
        at java.base/sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:230)
        at java.base/sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:132)
        at java.base/sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:631)
        ... 23 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:146)
        at java.base/sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:127)
        at java.base/java.security.cert.CertPathBuilder.build(CertPathBuilder.java:297)
        at java.base/sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:383)
        ... 28 more