NPE when running quick start sample app for java

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Jul 13, 2017, 4:13:19 PM7/13/17

to Google Identity Toolkit

2017-07-13 20:50:45.968:INFO::Started SocketC...@0.0.0.0:4567

Jul 13, 2017 8:51:49 PM com.google.identitytoolkit.GitkitVerifierManager initVerifiers

WARNING: unable to find token verifier: Connection timed out: connect

java.net.ConnectException: Connection timed out: connect

at java.net.DualStackPlainSocketImpl.connect0(Native Method)

at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)

at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)

at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)

at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)

at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

at java.net.Socket.connect(Socket.java:579)

at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:618)

at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:160)

at sun.net.NetworkClient.doConnect(NetworkClient.java:180)

at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)

at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)

at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:275)

at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371)

at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)

at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932)

at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1300)

at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)

at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)

at com.google.identitytoolkit.HttpSender.doHttpTransfer(HttpSender.java:91)

at com.google.identitytoolkit.HttpSender.get(HttpSender.java:52)

at com.google.identitytoolkit.RpcHelper.downloadCerts(RpcHelper.java:241)

at com.google.identitytoolkit.GitkitVerifierManager.initVerifiers(GitkitVerifierManager.java:69)

at com.google.identitytoolkit.GitkitVerifierManager.findVerifier(GitkitVerifierManager.java:59)

at net.oauth.jsontoken.JsonTokenParser.provideVerifiers(JsonTokenParser.java:230)

at net.oauth.jsontoken.JsonTokenParser.verify(JsonTokenParser.java:102)

at net.oauth.jsontoken.JsonTokenParser.verifyAndDeserialize(JsonTokenParser.java:116)

at com.google.identitytoolkit.JsonTokenHelper.verifyAndDeserialize(JsonTokenHelper.java:54)

at com.google.identitytoolkit.GitkitClient.validateTokenToJson(GitkitClient.java:166)

at com.google.identitytoolkit.GitkitClient.validateToken(GitkitClient.java:180)

at com.google.identitytoolkit.GitkitClient.validateTokenInRequest(GitkitClient.java:214)

at com.google.gitkit.samples.GitkitExample$LoginServlet.doGet(GitkitExample.java:76)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)

at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)

at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)

at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)

at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)

at org.mortbay.jetty.Server.handle(Server.java:326)

at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)

at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)

at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)

at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)

at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)

at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)

at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

2017-07-13 20:51:49.575:WARN::/

java.lang.NullPointerException

at net.oauth.jsontoken.crypto.AsciiStringVerifier.verifySignature(AsciiStringVerifier.java:47)

at net.oauth.jsontoken.JsonTokenParser.signatureIsValid(JsonTokenParser.java:177)

at net.oauth.jsontoken.JsonTokenParser.verify(JsonTokenParser.java:130)

at net.oauth.jsontoken.JsonTokenParser.verify(JsonTokenParser.java:103)