Can't compile project

[stephanmg]

Dear @miho,

i tried to compile the project with the procedure from the README.

However it results in an error:

./gradlew build
Downloading https://services.gradle.org/distributions/gradle-2.13-bin.zip

Exception in thread "main" javax.net.ssl.SSLException: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
	at sun.security.ssl.Alerts.getSSLException(Alerts.java:208)
	at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
	at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1906)
	at sun.security.ssl.SSLSocketImpl.handleException(SSLSocketImpl.java:1889)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1410)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
	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.getInputStream0(HttpURLConnection.java:1513)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
	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: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
	at sun.security.validator.PKIXValidator.<init>(PKIXValidator.java:90)
	at sun.security.validator.Validator.getInstance(Validator.java:179)
	at sun.security.ssl.X509TrustManagerImpl.getValidator(X509TrustManagerImpl.java:312)
	at sun.security.ssl.X509TrustManagerImpl.checkTrustedInit(X509TrustManagerImpl.java:171)
	at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:184)
	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
	at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1491)
	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)
	... 14 more
Caused by: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
	at java.security.cert.PKIXParameters.setTrustAnchors(PKIXParameters.java:200)
	at java.security.cert.PKIXParameters.<init>(PKIXParameters.java:120)
	at java.security.cert.PKIXBuilderParameters.<init>(PKIXBuilderParameters.java:104)
	at sun.security.validator.PKIXValidator.<init>(PKIXValidator.java:88)
	... 26 more

OS:

Distributor ID:	Ubuntu
Description:	Ubuntu 16.10
Release:	16.10
Codename:	yakkety

Java:
openjdk version "1.8.0_91"

I'm not sure what I'm doing wrong.

Best regards,
stephan

[miho]

It looks like your system has problems with downloading gradle 2.13. Please try with the official JDK or make sure the CA's of your OpenJDK installation are up to date. The command sudo update-ca-certificates -f might help.

[stephanmg]

The command sudo-update-ca-certificates -f might help

This did the job. Great.