My tiny app usually displays no errors at all, below exceptions look all bad and happen every 20 seconds with a unused version:
Here is the log link https://console.cloud.google.com/logs/viewer?project=badgers-987&minLogLevel=0&expandAll=false×tamp=2017-09-17T14%3A54%3A17.984979000Z&resource=gae_app%2Fmodule_id%2Fdefault%2Fversion_id%2F39-java8&logName=projects%2Fbadgers-987%2Flogs%2Fappengine.googleapis.com%252Frequest_log&advancedFilter=resource.type%3D%22gae_app%22%0Aresource.labels.zone%3D%22eu2%22%0Aresource.labels.project_id%3D%22badgers-987%22%0Aresource.labels.version_id%3D%2239-java8%22%0Aresource.labels.module_id%3D%22default%22%0Atimestamp%3D%222017-09-17T14%3A54%3A17.984979000Z%22%0AinsertId%3D%2259be8c9a00068348f172be0c%22 Copies of exceptions: exception 1: 16:55:24.315 com.google.apphosting.runtime.jetty9.JettyLogger warn: /_ah/spi/BackendService.getApiConfigs (JettyLogger.java:29 <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=39-java8&file=JettyLogger.java&line=29&logInsertId=59be8cdc000512944d5dca2b&logNanos=1505660123885681000&nestedLogIndex=0&project=badgers-987>) java.lang.NullPointerException at com.google.api.server.spi.SystemServiceServlet.execute( SystemServiceServlet.java:100 <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=39-java8&file=com%2Fgoogle%2Fapi%2Fserver%2Fspi%2FSystemServiceServlet.java&line=100&logInsertId=59be8cdc000512944d5dca2b&logNanos=1505660123885681000&nestedLogIndex=0&project=badgers-987>) at com.google.api.server.spi.SystemServiceServlet.doPost( SystemServiceServlet.java:71 <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=39-java8&file=com%2Fgoogle%2Fapi%2Fserver%2Fspi%2FSystemServiceServlet.java&line=71&logInsertId=59be8cdc000512944d5dca2b&logNanos=1505660123885681000&nestedLogIndex=0&project=badgers-987>) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:848) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1772) at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759) at com.google.apphosting.runtime.jetty9.SaveSessionFilter.doFilter(SaveSessionFilter.java:37) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759) at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at com.google.apphosting.runtime.jetty9.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:297) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.server.Server.handle(Server.java:534) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320) at com.google.apphosting.runtime.jetty9.RpcConnection.handle(RpcConnection.java:219) at com.google.apphosting.runtime.jetty9.RpcConnector.serviceRequest(RpcConnector.java:81) at com.google.apphosting.runtime.jetty9.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:108) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchServletRequest(JavaRuntime.java:650) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchRequest(JavaRuntime.java:612) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:582) at com.google.apphosting.runtime.JavaRuntime$NullSandboxRequestRunnable.run(JavaRuntime.java:776) at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:263) at java.lang.Thread.run(Thread.java:745) exception 2: 16:55:24.329 Uncaught exception from servlet java.lang.NullPointerException at com.google.api.server.spi.SystemServiceServlet.execute( SystemServiceServlet.java:100 <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=39-java8&file=com%2Fgoogle%2Fapi%2Fserver%2Fspi%2FSystemServiceServlet.java&line=100&logInsertId=59be8cdc000512944d5dca2b&logNanos=1505660123885681000&nestedLogIndex=2&project=badgers-987>) at com.google.api.server.spi.SystemServiceServlet.doPost( SystemServiceServlet.java:71 <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=39-java8&file=com%2Fgoogle%2Fapi%2Fserver%2Fspi%2FSystemServiceServlet.java&line=71&logInsertId=59be8cdc000512944d5dca2b&logNanos=1505660123885681000&nestedLogIndex=2&project=badgers-987>) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:848) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1772) at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759) at com.google.apphosting.runtime.jetty9.SaveSessionFilter.doFilter(SaveSessionFilter.java:37) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759) at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at com.google.apphosting.runtime.jetty9.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:297) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.server.Server.handle(Server.java:534) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320) at com.google.apphosting.runtime.jetty9.RpcConnection.handle(RpcConnection.java:219) at com.google.apphosting.runtime.jetty9.RpcConnector.serviceRequest(RpcConnector.java:81) at com.google.apphosting.runtime.jetty9.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:108) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchServletRequest(JavaRuntime.java:650) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchRequest(JavaRuntime.java:612) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:582) at com.google.apphosting.runtime.JavaRuntime$NullSandboxRequestRunnable.run(JavaRuntime.java:776) at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:263) at java.lang.Thread.run(Thread.java:745) -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. 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