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Comienza con FirebaseMessagingIT.testSend en FirebaseMessagingIT.java:74 y sigue el tiempo de espera agotado del token de acceso informado a través de ServiceAccountCredentials.refreshAccessToken. Reproduce la prueba y determina después si el fallo se debe al entorno o al SDK; la tarea está terminada cuando la causa y una resolución reproducible estén documentadas.

java.util.concurrent.ExecutionException: com.google.firebase.messaging.FirebaseMessagingException: Timed out while making an API call: Error getting access token for service account: connect timed out, iss: firebase-adminsdk-fsyd0@test-fbd60.iam.gserviceaccount.com

at com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:592)
at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:571)
at com.google.common.util.concurrent.FluentFuture$TrustedFuture.get(FluentFuture.java:91)
at com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:67)
at com.google.firebase.messaging.FirebaseMessagingIT.testSend(FirebaseMessagingIT.java:74)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)

Caused by: com.google.firebase.messaging.FirebaseMessagingException: Timed out while making an API call: Error getting access token for service account: connect timed out, iss: firebase-adminsdk-fsyd0@test-fbd60.iam.gserviceaccount.com
at com.google.firebase.messaging.FirebaseMessagingException.withMessagingErrorCode(FirebaseMessagingException.java:51)
at com.google.firebase.messaging.FirebaseMessagingClientImpl$MessagingErrorHandler.createException(FirebaseMessagingClientImpl.java:293)
at com.google.firebase.messaging.FirebaseMessagingClientImpl$MessagingErrorHandler.createException(FirebaseMessagingClientImpl.java:282)
at com.google.firebase.internal.AbstractHttpErrorHandler.handleIOException(AbstractHttpErrorHandler.java:63)
at com.google.firebase.internal.ErrorHandlingHttpClient.createHttpRequest(ErrorHandlingHttpClient.java:141)
at com.google.firebase.internal.ErrorHandlingHttpClient.send(ErrorHandlingHttpClient.java:92)
at com.google.firebase.internal.ErrorHandlingHttpClient.sendAndParse(ErrorHandlingHttpClient.java:72)
at com.google.firebase.messaging.FirebaseMessagingClientImpl.sendSingleRequest(FirebaseMessagingClientImpl.java:127)
at com.google.firebase.messaging.FirebaseMessagingClientImpl.send(FirebaseMessagingClientImpl.java:113)
at com.google.firebase.messaging.FirebaseMessaging$1.execute(FirebaseMessaging.java:141)
at com.google.firebase.messaging.FirebaseMessaging$1.execute(FirebaseMessaging.java:138)
at com.google.firebase.internal.CallableOperation.call(CallableOperation.java:36)
at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:131)
at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:75)
at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:82)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: com.google.auth.oauth2.GoogleAuthException: Error getting access token for service account: connect timed out, iss: firebase-adminsdk-fsyd0@test-fbd60.iam.gserviceaccount.com
at com.google.auth.oauth2.GoogleAuthException.createWithTokenEndpointIOException(GoogleAuthException.java:164)
at com.google.auth.oauth2.ServiceAccountCredentials.refreshAccessToken(ServiceAccountCredentials.java:543)
at com.google.auth.oauth2.OAuth2Credentials$1.call(OAuth2Credentials.java:269)
at com.google.auth.oauth2.OAuth2Credentials$1.call(OAuth2Credentials.java:266)
at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java)
at com.google.auth.oauth2.OAuth2Credentials$RefreshTask.run(OAuth2Credentials.java:633)
at com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:31)
at com.google.auth.oauth2.OAuth2Credentials$AsyncRefreshResult.executeIfNew(OAuth2Credentials.java:581)
at com.google.auth.oauth2.OAuth2Credentials.asyncFetch(OAuth2Credentials.java:232)
at com.google.auth.oauth2.OAuth2Credentials.getRequestMetadata(OAuth2Credentials.java:182)
at com.google.auth.oauth2.ServiceAccountCredentials.getRequestMetadata(ServiceAccountCredentials.java:938)
at com.google.auth.http.HttpCredentialsAdapter.initialize(HttpCredentialsAdapter.java:96)
at com.google.firebase.internal.FirebaseRequestInitializer.initialize(FirebaseRequestInitializer.java:55)
at com.google.api.client.http.HttpRequestFactory.buildRequest(HttpRequestFactory.java:91)
at com.google.firebase.internal.HttpRequestInfo.newHttpRequest(HttpRequestInfo.java:105)
at com.google.firebase.internal.ErrorHandlingHttpClient.createHttpRequest(ErrorHandlingHttpClient.java:137)
... 13 more
Caused by: java.net.SocketTimeoutException: connect timed out
at java.base/java.net.PlainSocketImpl.waitForConnect(Native Method)
at java.base/java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:107)
at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:412)
at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:255)
at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:237)
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.base/java.net.Socket.connect(Socket.java:608)
at java.base/sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:297)
at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:177)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:474)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:569)
at java.base/sun.net.www.protocol.https.HttpsClient.(HttpsClient.java:265)
at java.base/sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:372)
at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:203)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1187)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1081)
at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:189)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1367)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1342)
at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:246)
at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:113)
at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:84)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1012)
at com.google.auth.oauth2.ServiceAccountCredentials.refreshAccessToken(ServiceAccountCredentials.java:538)
... 28 more