Cannot deploy to app engine any more.

[chriszohno]

From last week I cannot deploy my app any more. I am not sure what changed.
I am getting this error now. Do you have any idea why?

ERROR] Failed to execute goal com.google.appengine:gcloud-maven-plugin:2.0.9.121.v20160815:deploy (default-cli) on project gaeapp: Execution default-cli of goal com.google.appengine:gcloud-maven-plugin:2.0.9.121.v20160815:deploy failed. NoSuchElementException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.google.appengine:gcloud-maven-plugin:2.0.9.121.v20160815:deploy (default-cli) on project gaeapp: Execution default-cli of goal com.google.appengine:gcloud-maven-plugin:2.0.9.121.v20160815:deploy failed.
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
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: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal com.google.appengine:gcloud-maven-plugin:2.0.9.121.v20160815:deploy failed.
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
... 20 more
Caused by: java.util.NoSuchElementException
at com.google.common.collect.AbstractIterator.next(AbstractIterator.java:154)
at com.google.common.collect.Iterators.find(Iterators.java:737)
at com.google.common.collect.Iterables.find(Iterables.java:642)
at com.google.appengine.SdkResolver.getSdk(SdkResolver.java:50)
at com.google.appengine.gcloudapp.AbstractGcloudMojo.resolveAndSetSdkRoot(AbstractGcloudMojo.java:619)
at com.google.appengine.gcloudapp.AbstractGcloudMojo.executeAppCfgStagingCommand(AbstractGcloudMojo.java:663)
at com.google.appengine.gcloudapp.GCloudAppStage.executeStaging(GCloudAppStage.java:153)
at com.google.appengine.gcloudapp.GCloudAppDeploy.execute(GCloudAppDeploy.java:41)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
... 21 more

[loosebazooka]

Is there a reason you haven't switched to https://github.com/GoogleCloudPlatform/app-maven-plugin ? Perhaps we could help with the transition.

[chriszohno]

I used app-maven-plugin at first. Then I followed Google's documentation and switched to gcloud tool. After switching everything worked until last week.
So it is better to use app-maven-plugin?

[chriszohno]

Tried app-maven-plugin, it works.
Does it use appengine-web.xml file? It seems the version from appengine-web-app is not used.

[loosebazooka]

Which document are you referring to?, I will contact someone to update the documentation. If you wish to use a plugin that uses gcloud, it is better to use https://github.com/GoogleCloudPlatform/app-maven-plugin

<dependency>
    <groupId>com.google.cloud.tools</groupId>
    <artifactId>appengine-maven-plugin</artifactId>
    <version>1.3.1</version>
</dependency>

Yes it still uses appengine-web.xml file.

[loosebazooka]

Correct, <version>/<application> must be configured in the pom.xml now, in the plugin configuration.

<deploy.project>
<deploy.version>