I've recently become unable to deploy an AppEngine project using the AppEngine Maven plugin's 'appengine:update' target. This has worked for me previously, but just today it seems to be failing for multiple projects. I've reviewed the files generated during my maven build process -- they all look fine to me -- the appengine-application.xml and appengine-web.xml both look correct, all of the files are where I expect them, etc.
[INFO] Google App Engine Java SDK - Updating Application [INFO] [INFO] Retrieving Google App Engine Java SDK from Maven [INFO] Updating Google App Engine Application [INFO] Running -A app-177622 --oauth2 update /......./src/web/app-ear/target/app-app-ear-4 Reading application configuration data... Processing module default Oct 28, 2017 1:02:30 PM com.google.apphosting.utils.config.IndexesXmlReader readConfigXml INFO: Successfully processed /......./src/web/app-ear/target/app-app-ear-4/app-app-4.war/WEB-INF/datastore-indexes.xml Ignoring application.xml context-root element, for details see https://developers.google.com/appengine/docs/java/modules/#config Beginning interaction for module default... 0% Created staging directory at: '/var/folders/sj/1g22m18516v4g1nml657ly380000gn/T/appcfg2859224178009721962.tmp' 5% Scanning for jsp files. 8% Generated git repository information file. 20% Scanning files on local disk. 25% Initiating update. Oct 28, 2017 1:02:32 PM com.google.appengine.tools.admin.AbstractServerConnection send1 WARNING: Error posting to URL: https://appengine.google.com/api/appversion/create?module=default&app_id=app-177622&version=4& 500 Internal Server Error Server Error (500)A server error has occurred. This is try #0 Oct 28, 2017 1:02:33 PM com.google.appengine.tools.admin.AbstractServerConnection send1 WARNING: Error posting to URL: https://appengine.google.com/api/appversion/create?module=default&app_id=app-177622&version=4& 500 Internal Server Error Server Error (500)A server error has occurred. This is try #1 Oct 28, 2017 1:02:34 PM com.google.appengine.tools.admin.AbstractServerConnection send1 WARNING: Error posting to URL: https://appengine.google.com/api/appversion/create?module=default&app_id=app-177622&version=4& 500 Internal Server Error Server Error (500)A server error has occurred. This is try #2 Oct 28, 2017 1:02:35 PM com.google.appengine.tools.admin.AbstractServerConnection send1 WARNING: Error posting to URL: https://appengine.google.com/api/appversion/create?module=default&app_id=app-177622&version=4& 500 Internal Server Error Server Error (500)A server error has occurred. This is try #3 com.google.appengine.tools.admin.HttpIoException: Error posting to URL: https://appengine.google.com/api/appversion/create?module=default&app_id=app-177622&version=4& 500 Internal Server Error Server Error (500)A server error has occurred. Unable to update app: Error posting to URL: https://appengine.google.com/api/appversion/create?module=default&app_id=app-177622&version=4& 500 Internal Server Error Server Error (500)A server error has occurred. Please see the logs [/var/folders/sj/1g22m18516v4g1nml657ly380000gn/T/appcfg7918010232880723505.log] for further information. The log file referenced above contains this: Unable to update: com.google.appengine.tools.admin.HttpIoException: Error posting to URL: https://appengine.google.com/api/appversion/create?module=default&app_id=app-177622&version=4& 500 Internal Server Error Server Error (500)A server error has occurred. at com.google.appengine.tools.admin.AbstractServerConnection.send1(AbstractServerConnection.java:371) at com.google.appengine.tools.admin.AbstractServerConnection.send(AbstractServerConnection.java:317) at com.google.appengine.tools.admin.AbstractServerConnection.post(AbstractServerConnection.java:296) at com.google.appengine.tools.admin.LoggingClientDeploySender.send(LoggingClientDeploySender.java:47) at com.google.appengine.tools.admin.AppVersionUpload.send(AppVersionUpload.java:1134) at com.google.appengine.tools.admin.AppVersionUpload.beginTransaction(AppVersionUpload.java:747) at com.google.appengine.tools.admin.AppVersionUpload.uploadFilesTransaction(AppVersionUpload.java:221) at com.google.appengine.tools.admin.AppVersionUpload.doUpload(AppVersionUpload.java:197) at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:580) at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:65) at com.google.appengine.tools.admin.AppCfg$UpdateAction.execute(AppCfg.java:1526) at com.google.appengine.tools.admin.AppCfg.executeAction(AppCfg.java:393) at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:216) at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:116) at com.google.appengine.tools.admin.AppCfg.main(AppCfg.java:112) at com.google.appengine.appcfg.AbstractAppCfgMojo.executeAppCfgCommand(AbstractAppCfgMojo.java:264) at com.google.appengine.appcfg.Update.execute(Update.java:32) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288) at org.apache.maven.cli.MavenCli.main(MavenCli.java:199) 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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) com.google.appengine.tools.admin.AdminException: Unable to update app: Error posting to URL: https://appengine.google.com/api/appversion/create?module=default&app_id=app -177622&version=4& 500 Internal Server Error Server Error (500)A server error has occurred. at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:586) at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:65) at com.google.appengine.tools.admin.AppCfg$UpdateAction.execute(AppCfg.java:1526) at com.google.appengine.tools.admin.AppCfg.executeAction(AppCfg.java:393) at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:216) at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:116) at com.google.appengine.tools.admin.AppCfg.main(AppCfg.java:112) at com.google.appengine.appcfg.AbstractAppCfgMojo.executeAppCfgCommand(AbstractAppCfgMojo.java:264) at com.google.appengine.appcfg.Update.execute(Update.java:32) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288) at org.apache.maven.cli.MavenCli.main(MavenCli.java:199) 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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) Caused by: com.google.appengine.tools.admin.HttpIoException: Error posting to URL: https://appengine.google.com/api/appversion/create?module=default&app_id=app -177622&version=4& 500 Internal Server Error Server Error (500)A server error has occurred. at com.google.appengine.tools.admin.AbstractServerConnection.send1(AbstractServerConnection.java:371) at com.google.appengine.tools.admin.AbstractServerConnection.send(AbstractServerConnection.java:317) at com.google.appengine.tools.admin.AbstractServerConnection.post(AbstractServerConnection.java:296) at com.google.appengine.tools.admin.LoggingClientDeploySender.send(LoggingClientDeploySender.java:47) at com.google.appengine.tools.admin.AppVersionUpload.send(AppVersionUpload.java:1134) at com.google.appengine.tools.admin.AppVersionUpload.beginTransaction(AppVersionUpload.java:747) at com.google.appengine.tools.admin.AppVersionUpload.uploadFilesTransaction(AppVersionUpload.java:221) at com.google.appengine.tools.admin.AppVersionUpload.doUpload(AppVersionUpload.java:197) at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:580) ... 30 more I ran across this post (https://issuetracker.google.com/issues/68317095) and tried disabling lifecycle management on my staging bucket, to no avail. 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