gRPC (Speech API) working on App Engine

[rafaelsf80]

Hi,

Is Speech API (gRPC) working on App engine (Java) ? Speech REST API works fine within a servlet, but I got an run-time exception then creating the channel on a gRPC version:

Thanks,

      GoogleCredentials creds = GoogleCredentials.getApplicationDefault();
       creds = creds.createScoped(OAUTH2_SCOPES);
       ManagedChannel channel =
       new NettyChannelProvider()
               .builderForAddress(host, port)
               .nameResolverFactory(new DnsNameResolverProvider())
               .intercept(new GoogleCredentialsInterceptor( creds ))
               .build();

java.lang.NoClassDefFoundError: java.nio.channels.spi.SelectorProvider is a restricted class. Please see the Google App Engine developer's guide for more details.
at com.google.apphosting.runtime.security.shared.stub.java.nio.channels.spi.SelectorProvider.(SelectorProvider.java)
at io.netty.channel.nio.NioEventLoopGroup.(NioEventLoopGroup.java:59)
at io.grpc.netty.Utils$DefaultEventLoopGroupResource.create(Utils.java:187)
at io.grpc.netty.Utils$DefaultEventLoopGroupResource.create(Utils.java:171)
at io.grpc.internal.SharedResourceHolder.getInternal(SharedResourceHolder.java:121)
at io.grpc.internal.SharedResourceHolder.get(SharedResourceHolder.java:91)
at io.grpc.netty.NettyChannelBuilder$NettyTransportFactory.(NettyChannelBuilder.java:311)
at io.grpc.netty.NettyChannelBuilder$NettyTransportFactory.(NettyChannelBuilder.java:280)
at io.grpc.netty.NettyChannelBuilder.buildTransportFactory(NettyChannelBuilder.java:230)
at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:239)
at com.rafaelsf80.backend.speech.UploadServletGrpc.createChannel(UploadServletGrpc.java:140)
at com.rafaelsf80.backend.speech.UploadServletGrpc.doPost(UploadServletGrpc.java:114)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:37)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:257)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:145)
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:516)
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)
at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:276)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:320)
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:312)
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:235)
at java.lang.Thread.run(Thread.java:745)

[jerjou]

Yeah - unfortunately, grpc isn't working on app engine standard yet. We're working on it, but for the time being if you need grpc you can try using app engine flex.