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cloud-firestore issue when running in DevAppServer GAE Standard Java 8 #2544

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ifigotin opened this issue Oct 20, 2017 · 5 comments
Closed

cloud-firestore issue when running in DevAppServer GAE Standard Java 8 #2544

ifigotin opened this issue Oct 20, 2017 · 5 comments
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@pongad
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api: firestore Issues related to the Firestore API. priority: p2 Moderately-important priority. Fix may not be included in next release. running on app engine type: bug Error or flaw in code with unintended results or allowing sub-optimal usage patterns.

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@ifigotin
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ifigotin commented Oct 20, 2017 •
edited by pongad
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When using the latest Firestore library we are getting the following error (in devappserver, GAE Standard, Java 8):

Caused by: com.google.apphosting.api.ApiProxy$CallNotFoundException: Can't make API call urlfetch.Fetch in a thread that is neither the original request thread nor a thread created by ThreadManager at com.google.apphosting.api.ApiProxy$CallNotFoundException.foreignThread(ApiProxy.java:844) at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:116) at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:40) at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.fetchResponse(URLFetchServiceStreamHandler.java:543) at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getInputStream(URLFetchServiceStreamHandler.java:422) at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getResponseCode(URLFetchServiceStreamHandler.java:275) at com.google.api.client.http.javanet.NetHttpResponse.<init>(NetHttpResponse.java:37) at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:105) at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:981) at com.google.auth.oauth2.UserCredentials.refreshAccessToken(UserCredentials.java:210) at com.google.auth.oauth2.OAuth2Credentials.refresh(OAuth2Credentials.java:160) at com.google.auth.oauth2.OAuth2Credentials.getRequestMetadata(OAuth2Credentials.java:146) at io.grpc.auth.GoogleAuthLibraryCallCredentials$1.run(GoogleAuthLibraryCallCredentials.java:98)

The issue is triggered by a simple example:

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws ServletException, IOException {
    Firestore firestore = FirestoreOptions.getDefaultInstance().toBuilder().build().getService();
    // Firestore firestore = FirestoreClient.getFirestore();
    DocumentReference doc = firestore.collection("cities").document("Mountain View");
    try {
      resp.getWriter().println("Count: " + doc.get().get().get("count"));
    } catch (Exception e) {
      throw new ServletException(e);
    }
  }

This one may be similar to the following two issues we fixed earlier:
#2150
#2275
#2306
#2300

@neozwu is this the same issue?
@vam-google vam-google added type: bug Error or flaw in code with unintended results or allowing sub-optimal usage patterns. running on app engine api: firestore Issues related to the Firestore API. labels Oct 23, 2017
@garrettjonesgoogle garrettjonesgoogle added the priority: p2 Moderately-important priority. Fix may not be included in next release. label Oct 26, 2017
@neozwu
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neozwu commented Oct 31, 2017

@ifigotin can I confirm whether this is only an issue on devserver, but not an issue on prod server ?

@hiranya911 hiranya911 mentioned this issue Dec 13, 2017
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@pongad
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pongad commented Feb 1, 2018

I'll close this due to inactivity. @ifigotin please reopen if required.

@pongad pongad closed this as completed Feb 1, 2018
@hiranya911
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This issue occurs in latest versions of dev app server as well:

[INFO] GCLOUD: javax.servlet.ServletException: java.util.concurrent.ExecutionException: io.grpc.StatusRuntimeException: UNAUTHENTICATED: Failed computing credential metadata
[INFO] GCLOUD: 	at com.google.firebase.examples.HelloAppEngine.doGet(HelloAppEngine.java:35)
[INFO] GCLOUD: 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
[INFO] GCLOUD: 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:848)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1772)
[INFO] GCLOUD: 	at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:128)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.jetty9.StaticFileFilter.doFilter(StaticFileFilter.java:122)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1751)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
[INFO] GCLOUD: 	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:112)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:596)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.Server.handle(Server.java:534)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
[INFO] GCLOUD: 	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283)
[INFO] GCLOUD: 	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
[INFO] GCLOUD: 	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
[INFO] GCLOUD: 	at java.lang.Thread.run(Thread.java:748)
[INFO] GCLOUD: Caused by: 
[INFO] GCLOUD: java.util.concurrent.ExecutionException: io.grpc.StatusRuntimeException: UNAUTHENTICATED: Failed computing credential metadata
[INFO] GCLOUD: 	at com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:500)
[INFO] GCLOUD: 	at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:479)
[INFO] GCLOUD: 	at com.google.common.util.concurrent.AbstractFuture$TrustedFuture.get(AbstractFuture.java:76)
[INFO] GCLOUD: 	at com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:62)
[INFO] GCLOUD: 	at com.google.firebase.examples.HelloAppEngine.doGet(HelloAppEngine.java:30)
[INFO] GCLOUD: 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
[INFO] GCLOUD: 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:848)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1772)
[INFO] GCLOUD: 	at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:128)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.jetty9.StaticFileFilter.doFilter(StaticFileFilter.java:122)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1751)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
[INFO] GCLOUD: 	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
[INFO] GCLOUD: 	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:112)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
[INFO] GCLOUD: 	at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:596)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.Server.handle(Server.java:534)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
[INFO] GCLOUD: 	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
[INFO] GCLOUD: 	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283)
[INFO] GCLOUD: 	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
[INFO] GCLOUD: 	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
[INFO] GCLOUD: 	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
[INFO] GCLOUD: 	at java.lang.Thread.run(Thread.java:748)
[INFO] GCLOUD: Caused by: 
[INFO] GCLOUD: io.grpc.StatusRuntimeException: UNAUTHENTICATED: Failed computing credential metadata
[INFO] GCLOUD: 	at io.grpc.Status.asRuntimeException(Status.java:526)
[INFO] GCLOUD: 	at com.google.api.gax.grpc.GrpcDirectStreamController$ResponseObserverAdapter.onClose(GrpcDirectStreamController.java:127)
[INFO] GCLOUD: 	at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:41)
[INFO] GCLOUD: 	at io.grpc.internal.CensusStatsModule$StatsClientInterceptor$1$1.onClose(CensusStatsModule.java:684)
[INFO] GCLOUD: 	at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:41)
[INFO] GCLOUD: 	at io.grpc.internal.CensusTracingModule$TracingClientInterceptor$1$1.onClose(CensusTracingModule.java:392)
[INFO] GCLOUD: 	at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:475)
[INFO] GCLOUD: 	at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:63)
[INFO] GCLOUD: 	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:557)
[INFO] GCLOUD: 	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:478)
[INFO] GCLOUD: 	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:590)
[INFO] GCLOUD: 	at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
[INFO] GCLOUD: 	at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
[INFO] GCLOUD: 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[INFO] GCLOUD: 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[INFO] GCLOUD: 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
[INFO] GCLOUD: 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
[INFO] GCLOUD: 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[INFO] GCLOUD: 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[INFO] GCLOUD: 	at java.lang.Thread.run(Thread.java:748)
[INFO] GCLOUD: Caused by: 
[INFO] GCLOUD: com.google.apphosting.api.ApiProxy$CallNotFoundException: Can't make API call urlfetch.Fetch in a thread that is neither the original request thread nor a thread created by ThreadManager
[INFO] GCLOUD: 	at com.google.apphosting.api.ApiProxy$CallNotFoundException.foreignThread(ApiProxy.java:844)
[INFO] GCLOUD: 	at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:116)
[INFO] GCLOUD: 	at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:40)
[INFO] GCLOUD: 	at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.fetchResponse(URLFetchServiceStreamHandler.java:543)
[INFO] GCLOUD: 	at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getInputStream(URLFetchServiceStreamHandler.java:422)
[INFO] GCLOUD: 	at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getResponseCode(URLFetchServiceStreamHandler.java:275)
[INFO] GCLOUD: 	at com.google.api.client.http.javanet.NetHttpResponse.<init>(NetHttpResponse.java:37)
[INFO] GCLOUD: 	at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:105)
[INFO] GCLOUD: 	at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:981)
[INFO] GCLOUD: 	at com.google.auth.oauth2.ServiceAccountCredentials.refreshAccessToken(ServiceAccountCredentials.java:378)
[INFO] GCLOUD: 	at com.google.auth.oauth2.OAuth2Credentials.refresh(OAuth2Credentials.java:160)
[INFO] GCLOUD: 	at com.google.auth.oauth2.OAuth2Credentials.getRequestMetadata(OAuth2Credentials.java:146)
[INFO] GCLOUD: 	at com.google.auth.Credentials.blockingGetToCallback(Credentials.java:103)
[INFO] GCLOUD: 	at com.google.auth.Credentials$1.run(Credentials.java:92)
[INFO] GCLOUD: 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[INFO] GCLOUD: 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[INFO] GCLOUD: 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
[INFO] GCLOUD: 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
[INFO] GCLOUD: 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[INFO] GCLOUD: 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[INFO] GCLOUD: 	at java.lang.Thread.run(Thread.java:748)

This was while trying to run a Firestore API call from the app.

@pongad
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pongad commented Feb 26, 2018

@hiranya911 I'm not able to reproduce the problem. Could you let us know what SDK version you're using?

I'm testing with:

    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-api-1.0-sdk</artifactId>
      <version>1.9.60</version>
    </dependency>

@hiranya911
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Here's my pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project>
  <modelVersion>4.0.0</modelVersion>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>

  <groupId>com.google.firebase.examples</groupId>
  <artifactId>fireflicks-service</artifactId>

  <properties>
    <!-- uncomment if you wish to set your project here project- gcloud is used otherwise -->
    <!-- <app.deploy.project>hkj-firestore-bash</app.deploy.project> -->
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.showDeprecation>true</maven.compiler.showDeprecation>
    <archiveClasses>true</archiveClasses>
  </properties>

  <dependencies>
    <!-- Compile/runtime dependencies -->
    <dependency>
      <groupId>com.google.appengine</groupId>
      <artifactId>appengine-api-1.0-sdk</artifactId>
      <version>1.9.59</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <type>jar</type>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>com.google.firebase</groupId>
      <artifactId>firebase-admin</artifactId>
      <version>5.9.0</version>
    </dependency>
  </dependencies>

  <build>
    <!-- for hot reload of the web application-->
    <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
    <plugins>
      <plugin>
        <groupId>com.google.cloud.tools</groupId>
        <artifactId>appengine-maven-plugin</artifactId>
        <version>1.3.1</version>
        <configuration>
        </configuration>
      </plugin>

      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>versions-maven-plugin</artifactId>
        <version>2.3</version>
        <executions>
          <execution>
            <phase>compile</phase>
            <goals>
              <goal>display-dependency-updates</goal>
              <goal>display-plugin-updates</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <excludes>
            <exclude>javax.servlet:javax.servlet-api</exclude>
            <exclude>com.google.guava:guava</exclude> <!-- avoid android version -->
          </excludes>
        </configuration>
      </plugin>

      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.1.0</version>
      </plugin>

      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.6.1</version>
      </plugin>

      <plugin>
        <artifactId>maven-clean-plugin</artifactId>
        <version>3.0.0</version>
      </plugin>

      <plugin>
        <artifactId>maven-install-plugin</artifactId>
        <version>2.5.2</version>
      </plugin>

      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.20</version>
      </plugin>

      <plugin>
        <artifactId>maven-site-plugin</artifactId>
        <version>3.6</version>
      </plugin>

      <plugin>
        <artifactId>maven-resources-plugin</artifactId>
        <version>3.0.2</version>
      </plugin>

      <plugin>
        <artifactId>maven-deploy-plugin</artifactId>
        <version>3.1</version>
      </plugin>

      <plugin>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>1.4.1</version>
        <executions>
          <execution>
            <id>enforce-maven</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <requirePluginVersions>
                   <message>Best Practice is to always define plugin versions!</message>
                   <banLatest>true</banLatest>
                   <banRelease>true</banRelease>
                   <phases>clean,deploy,verify,appengine:run,appengine:deploy,appengine:update,appengine:devappaserver,site</phases>
                </requirePluginVersions>
              </rules>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

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@pongad pongad

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api: firestore Issues related to the Firestore API. priority: p2 Moderately-important priority. Fix may not be included in next release. running on app engine type: bug Error or flaw in code with unintended results or allowing sub-optimal usage patterns.
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@ifigotin @pongad @hiranya911 @garrettjonesgoogle @vam-google @neozwu