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Microsoft Windows [Version 10.0.19042.508]
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C:\svn\branches>gradlew
Downloading https://services.gradle.org/distributions/gradle-3.0-bin.zip

Exception in thread "main" 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 java.base/sun.security.ssl.Alerts.getSSLException(Alerts.java:198)
        at java.base/sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1969)
        at java.base/sun.security.ssl.Handshaker.fatalSE(Handshaker.java:345)
        at java.base/sun.security.ssl.Handshaker.fatalSE(Handshaker.java:339)
        at java.base/sun.security.ssl.ClientHandshaker.checkServerCerts(ClientHandshaker.java:1968)
        at java.base/sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1777)
        at java.base/sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:264)
        at java.base/sun.security.ssl.Handshaker.processLoop(Handshaker.java:1092)
        at java.base/sun.security.ssl.Handshaker.processRecord(Handshaker.java:1026)
        at java.base/sun.security.ssl.SSLSocketImpl.processInputRecord(SSLSocketImpl.java:1137)
        at java.base/sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1074)
        at java.base/sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:973)
        at java.base/sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1402)
        at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1429)
        at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)
        at java.base/sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:567)
        at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1581)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1509)
        at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:245)
        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:107)
        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:385)
        at java.base/sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:290)
        at java.base/sun.security.validator.Validator.validate(Validator.java:264)
        at java.base/sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:343)
        at java.base/sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:226)
        at java.base/sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:133)
        at java.base/sun.security.ssl.ClientHandshaker.checkServerCerts(ClientHandshaker.java:1947)
        ... 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: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:380)
        ... 29 more

please help this issue .