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Unable to connect to RMI server when running Client from Servlet [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 1 year ago.
Have a Java servlet running using a Tomcat server. So when the servlet starts, I would like the client to connect to a RMI registry (Port 33996). The client is initialized during the init() of the servlet. However, for some reason, it is unable to connect to the server
Server code
#Override
public void startRMIRegistry(CentralServer server){
try {
AsyncLogger.log("Setting up RMI Registry.....");
Registry registry = LocateRegistry.createRegistry(
Integer.parseInt(ServerConfigUtils.getProperty(ServerConfigUtils.PORT)));
registry.rebind(ServerConfigUtils.getProperty(ServerConfigUtils.NAME), server);
} catch (RemoteException e) {
e.printStackTrace();
}
}
Client code
private ICentralServer getServerConnection() {
String serverHost = ServerConfigUtils.getProperty(ServerConfigUtils.HOST);
Integer serverPort = Integer.valueOf(ServerConfigUtils.getProperty(ServerConfigUtils.PORT));
String serverName = ServerConfigUtils.getProperty(ServerConfigUtils.NAME);
Integer failureCount = 0;
while (failureCount < SERVER_ACTION_ATTEMPTS) {
try {
return (ICentralServer)
LocateRegistry.getRegistry(serverHost, serverPort).lookup(serverName);
} catch (Exception e) {
failureCount++;
continue;
}
}
AsyncLogger.log("Failed to connect to central server, giving up");
throw new RuntimeException();
}
Servlet
#Override
public void init() throws ServletException {
try {
client = new LabClient();
} catch (Exception e) {
e.printStackTrace();
}
super.init();
}
Error
INFO: Starting ProtocolHandler ["http-nio-8080"]
sg.gov.moh.exceptions.CannotReachServerException: java.lang.NullPointerException
at sg.gov.moh.client.LabClient.<init>(LabClient.java:366)
at launcher.servlet.MainServlet.init(MainServlet.java:36)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1152)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1097)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:768)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:133)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:544)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:624)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1651)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at sg.gov.moh.centralServer.CentralServer.pingOrPrune(CentralServer.java:318)
at sg.gov.moh.centralServer.CentralServer.registerLaboratory(CentralServer.java:297)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:303)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:279)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:163)
at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:235)
at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:180)
at com.sun.proxy.$Proxy5.registerLaboratory(Unknown Source)
at sg.gov.moh.client.LabClient.registerCallback(LabClient.java:69)
at sg.gov.moh.client.LabClient.<init>(LabClient.java:364)
... 21 more
Had my peers tried this code, they were all able to connect successfully.
Have tried toggling off firewall, setting inbound rules to the port but to no avail

Found the solution, I ran mvn clean package at the parent maven directory, previously I was rebuilding the sub-modules invidually at sub-module level, which corrupted the bytecode.
|- Parent
| |--Sub-module a
| |--Sub-module b
|
|

com.google.firebase.messaging.FirebaseMessagingException: Error while calling FCM backend service

I am trying to send the fcm notification :
MulticastMessage message = MulticastMessage.builder()
.addAllTokens(registrationTokens)
.putAllData(body)
.build();
System.setProperty("https.protocols", "TLSv1,TLSv1.1,TLSv1.2");
BatchResponse response = FirebaseMessaging.getInstance().sendMulticast(message);
Sometimes the code on the server encounters this problem
com.google.firebase.messaging.FirebaseMessagingException: Error while calling FCM backend service
at com.google.firebase.messaging.FirebaseMessagingClientImpl.sendAll(FirebaseMessagingClientImpl.java:142)
at com.google.firebase.messaging.FirebaseMessaging$2.execute(FirebaseMessaging.java:293)
at com.google.firebase.messaging.FirebaseMessaging$2.execute(FirebaseMessaging.java:290)
at com.google.firebase.internal.CallableOperation.call(CallableOperation.java:36)
at com.google.firebase.messaging.FirebaseMessaging.sendAll(FirebaseMessaging.java:183)
at com.google.firebase.messaging.FirebaseMessaging.sendMulticast(FirebaseMessaging.java:252)
at com.google.firebase.messaging.FirebaseMessaging.sendMulticast(FirebaseMessaging.java:227)
at ir.mirorim.vn.serviceImp.userService.NotificationServiceImp.sendMultipleMessage(NotificationServiceImp.java:351)
at ir.mirorim.vn.serviceImp.userService.NotificationServiceImp.testNotification(NotificationServiceImp.java:130)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:810)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: 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:350)
What i am doing wrong. All the config are with the code while compilation.
The part where I load the Firebase configuration file
#PostConstruct
public void init() {
try {
String configPath = servletContext.getRealPath("/WEB-INF/mm-firebase-adminsdk-oqtey-c111bb111c.json");
FileInputStream serviceAccount =
new FileInputStream(configPath);
FirebaseOptions options = new FirebaseOptions.Builder()
.setCredentials(GoogleCredentials.fromStream(serviceAccount))
.setDatabaseUrl("https://****-****.firebaseio.com")
.build();
FirebaseApp.initializeApp(options);
}
catch (Exception e){
e.printStackTrace();
}
}
my json config:
{
"type": "service_account",
"project_id": "mm-1111",
"private_key_id": "**************************",
"private_key": "-----BEGIN PRIVATE KEY-----
xxx
---END PRIVATE KEY-----\n",
"client_email": "firebase-adminsdk-kvj7w#mm-1111.iam.gserviceaccount.com",
"client_id": "1000559483501236*****",
"auth_uri": "https://accounts.google.com/o/oauth2/auth",
"token_uri": "https://oauth2.googleapis.com/token",
"auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
"client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-kvj7w%mm-1111.iam.gserviceaccount.com"
}
Are these server blocked or what? How should I debug those?
Can anyone help me?

Connection timed out when call Rest API from Eclipse

Help me! I have a restful API link, I used Postman tool call success, but when I code on eclipse a Restful client, it's fail. I tried on off proxy, but not success.
public class JersyGetClient {
public static void main(String[] args) {
String url = "https://abc.custhelp.com/services/rest/connect/v1.4/accounts";
String name = "thai.hoangan";
String password = "123456a#";
String authString = name + ":" + password;
String authStringEnc = new BASE64Encoder().encode(authString.getBytes());
System.out.println("Base64 encoded auth string: " + authStringEnc);
Client restClient = Client.create();
WebResource webResource = restClient.resource(url);
ClientResponse resp = webResource.accept("application/json")
.header("Authorization", "Basic " + authStringEnc)
.header("OSvC-CREST-Application-Context", "asd")
.get(ClientResponse.class);
if (resp.getStatus() != 200) {
System.err.println("Unable to connect to the server");
}
String output = resp.getEntity(String.class);
System.out.println("response: " + output);
}
}
Output:
Exception in thread "main" com.sun.jersey.api.client.ClientHandlerException:
java.net.ConnectException: Connection timed out: connect
at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:155)
at com.sun.jersey.api.client.Client.handle(Client.java:652)
at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682)
at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)
at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:509)
at JersyGetClient.main(JersyGetClient.java:22)
Caused by: 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:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:668)
at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
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.(HttpsClient.java:264)
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1105)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1513)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)
at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:253)
at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:153)
... 5 more

Oh, I resolved, Just add:
System.setProperty("https.proxyHost", "proxytest.vcb");
System.setProperty("https.proxyPort", "8080");

Getting unknown exception while contacting Google Cloud Api through a Proxy Server

Sitting behind the Proxy Server of my corporate, i have difficulties, accessing the Google Speech API.
My code is the following (copied and modified from a sample from google):
System.setProperty("http.proxyHost", "x.x.x.x");
System.setProperty("http.proxyPort", "xxxx");
System.setProperty("https.proxyHost", "x.x.x.x");
System.setProperty("https.proxyPort", "xxxx");
FileInputStream credentialsStream = new FileInputStream("C:\\Path\\To\\Credentials.json");
GoogleCredentials credentials = GoogleCredentials.fromStream(credentialsStream);
FixedCredentialsProvider credentialsProvider = FixedCredentialsProvider.create(credentials);
SpeechSettings speechSettings = SpeechSettings.newBuilder().setCredentialsProvider(credentialsProvider).build();
try (SpeechClient speechClient = SpeechClient.create(speechSettings)) {
RecognitionConfig.AudioEncoding encoding = RecognitionConfig.AudioEncoding.LINEAR16;
int sampleRateHertz = 16000;
String languageCode = "de-DE";
RecognitionConfig config = RecognitionConfig.newBuilder().setEncoding(encoding)
.setSampleRateHertz(sampleRateHertz).setLanguageCode(languageCode).build();
String uri = "C:\\recordings\\testRec16hz.wav";
RecognitionAudio audio = RecognitionAudio.newBuilder().setUri(uri).build();
RecognizeResponse response = speechClient.recognize(config, audio);
}
Getting the following error:
Exception in thread "main" com.google.api.gax.rpc.UnknownException: io.grpc.StatusRuntimeException: UNKNOWN
at com.google.api.gax.rpc.ApiExceptionFactory.createException(ApiExceptionFactory.java:47)
at com.google.api.gax.grpc.GrpcExceptionCallable$ExceptionTransformingFuture.setException(GrpcExceptionCallable.java:118)
at com.google.api.gax.grpc.GrpcExceptionCallable$ExceptionTransformingFuture.onFailure(GrpcExceptionCallable.java:101)
at com.google.api.core.ApiFutures$1.onFailure(ApiFutures.java:61)
at com.google.common.util.concurrent.Futures$4.run(Futures.java:1123)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:435)
at com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:900)
at com.google.common.util.concurrent.AbstractFuture.complete(AbstractFuture.java:811)
at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:675)
at io.grpc.stub.ClientCalls$GrpcFuture.setException(ClientCalls.java:492)
at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:467)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:41)
at io.grpc.internal.CensusStatsModule$StatsClientInterceptor$1$1.onClose(CensusStatsModule.java:684)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:41)
at io.grpc.internal.CensusTracingModule$TracingClientInterceptor$1$1.onClose(CensusTracingModule.java:392)
at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:475)
at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:63)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:557)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:478)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:590)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: io.grpc.StatusRuntimeException: UNKNOWN
at io.grpc.Status.asRuntimeException(Status.java:526)
... 19 more
Caused by: java.nio.channels.UnresolvedAddressException
at sun.nio.ch.Net.checkAddress(Net.java:101)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:622)
at io.netty.util.internal.SocketUtils$3.run(SocketUtils.java:83)
at io.netty.util.internal.SocketUtils$3.run(SocketUtils.java:80)
at java.security.AccessController.doPrivileged(Native Method)
at io.netty.util.internal.SocketUtils.connect(SocketUtils.java:80)
at io.netty.channel.socket.nio.NioSocketChannel.doConnect(NioSocketChannel.java:308)
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.connect(AbstractNioChannel.java:254)
at io.netty.channel.DefaultChannelPipeline$HeadContext.connect(DefaultChannelPipeline.java:1291)
at io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:545)
at io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:530)
at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.connect(CombinedChannelDuplexHandler.java:497)
at io.netty.channel.ChannelOutboundHandlerAdapter.connect(ChannelOutboundHandlerAdapter.java:47)
at io.netty.channel.CombinedChannelDuplexHandler.connect(CombinedChannelDuplexHandler.java:298)
at io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:545)
at io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:530)
at io.netty.handler.proxy.ProxyHandler.connect(ProxyHandler.java:181)
at io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:545)
at io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:530)
at io.netty.handler.ssl.SslHandler.connect(SslHandler.java:674)
at io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:545)
at io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:530)
at io.netty.handler.codec.http2.Http2ConnectionHandler.connect(Http2ConnectionHandler.java:459)
at io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:545)
at io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:530)
at io.netty.channel.ChannelDuplexHandler.connect(ChannelDuplexHandler.java:50)
at io.grpc.netty.ProtocolNegotiators$AbstractBufferingHandler.connect(ProtocolNegotiators.java:458)
at io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:545)
at io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:530)
at io.netty.channel.ChannelDuplexHandler.connect(ChannelDuplexHandler.java:50)
at io.grpc.netty.ProtocolNegotiators$AbstractBufferingHandler.connect(ProtocolNegotiators.java:458)
at io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:545)
at io.netty.channel.AbstractChannelHandlerContext.access$1000(AbstractChannelHandlerContext.java:38)
at io.netty.channel.AbstractChannelHandlerContext$11.run(AbstractChannelHandlerContext.java:535)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
... 1 more
I think the response might be directed from the proxy server and therefore not readable by the google sdk.
When I run without setting the proxy-properties, i get the following after a while:
com.google.api.gax.rpc.DeadlineExceededException: io.grpc.StatusRuntimeException: DEADLINE_EXCEEDED: deadline exceeded: -115304848173 ns from now
How can I read the Response to further information?
How do I proceed - do I need to contact the admin of the proxy server?

Java Errors on HttpURLConnection

I wrote something similar to this and it was giving me an error. So I found this online and it still gives me an error. What Am I not doing correct ?
/* package whatever; // don't place package name! */
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
public static void main (String[] args) throws java.lang.Exception
{
URL u = new URL ("http://www.yahoo.com/");
HttpURLConnection huc = ( HttpURLConnection ) u.openConnection ();
huc.setRequestMethod ("GET"); //OR huc.setRequestMethod ("HEAD");
huc.connect();
int code = huc.getResponseCode();
System.out.println(code);
}
}
The errors I am getting are
Exception in thread "main" java.net.UnknownHostException: www.yahoo.com
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
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 java.net.Socket.connect(Socket.java:528)
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.http.HttpClient.<init>(HttpClient.java:211)
at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:996)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:850)
at urlCheck.UrlRTest.main(UrlRTest.java:30) " LINE 30 is huc.connect();
The error has been seen in SpringToolSuite & Ideone.com