Question

———— Deploying frontend ————

Preparing to deploy: Created staging directory at:
‘C:\Users\ADMINI~1\AppData\Local\Temp\appcfg2555411734473986257.tmp’
java.lang.RuntimeException: The application contains Java 7 classes,
but the –use_java7 flag has not been set.

Debugging information may be found in
C:\Users\Administrator\AppData\Local\Temp\appengine-deploy7182870224187999057.log

Debug Log:

Unable to update:
java.lang.RuntimeException: The application contains Java 7 classes, but the –use_java7 flag has not been set.
at com.google.appengine.tools.admin.Application.createStagingDirectory(Application.java:576)
at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:370)
at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:53)
at com.google.appengine.eclipse.core.proxy.AppEngineBridgeImpl.deploy(AppEngineBridgeImpl.java:433)
at com.google.appengine.eclipse.core.deploy.DeployProjectJob.runInWorkspace(DeployProjectJob.java:148)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

I’m attempting to deploy a google app to my google app engine account and eclipse is giving me this error. It seems rather straight forward, but I can’t find where to set a flag for java7.

I’m using the latest version of Eclipse (Juno Service Release 1) and my google plugin is 4.2.

Answer 1

As per the 1.7.3 blog post:

In an upcoming release, we will be including some of the new Java 7
functionality as well as formal Java 7 support within the App Engine
Java runtime.

and…

And while Java 7 support is not yet available within the App Engine
Java runtime, developers interested in an early preview can sign up
for our trusted tester program.

You’ll need to either be accepted into the TT program, or to wait for a future release where Java 7 works in production.