error with google app engine deploy

Question

I have a problem with the deployment on Google app engine. The project runs fine on my PC but when I upload it, I get the following message:

Please enter code: Either the access code is invalid or the OAuth token is revoked.Details: invalid_grant

After that the browser opens a page where Google app engine asks for permission and, once I give it, provides a code to be copied in the application. But the input window doesn't work since it's stuck with the previous message.

I'm using NetBeans v8 with appengine-java-sdk v1.9, and got the same error with the example project

I alredy tried to delete the file .appcfg_oauth2_tokens_java but it didn't work.

Any help would be appreciated, thanks.

Appengine-web.xml

<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<application>fiery-plate-97015</application>
<version>1</version>
<threadsafe>true</threadsafe>
<system-properties>
    <property name="java.util.logging.config.file" value="WEB-   INF/logging.properties"/>
</system-properties>

Web.xml

<?xml version="1.0" encoding="utf-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
    <servlet-name>guestbook</servlet-name>
    <servlet-class>guestbook.GuestbookServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>guestbook</servlet-name>
    <url-pattern>/guestbook</url-pattern>
</servlet-mapping>

<servlet>
    <servlet-name>sign</servlet-name>
    <servlet-class>guestbook.SignGuestbookServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>sign</servlet-name>
    <url-pattern>/sign</url-pattern>
</servlet-mapping>

<welcome-file-list>
    <welcome-file>guestbook.jsp</welcome-file>
</welcome-file-list>

Situation update: i never used maven so i took me a while and a lot of errors to make it works. At the end i created a new project following step by step google instruction: https://cloud.google.com/appengine/docs/java/gettingstarted/creating. The project works fine on my pc and seems to deploy correctly but the i get a 500 server error when visiting the page. Meanwhile maven installation messed up with netbeans and, when deploying the first project, i get a exception before being asked for the code:

java.lang.RuntimeException: Cannot get the System Java Compiler. Please use a JDK, not a JRE.

i checked the system variables to point to jdk folder but the problem persists.

Answer 1

Your <application>guestbook</applicaiton tag in your appengine-web.xml is incorrect, I believe. That should be your unique project ID at http://console.developers.google.com. You can create one there if you don't have one.

Answer 2

The 500 error from the Google App Engine is due to runtime error. If you check logs, and it seems you did already your getting the Unsupported major.minor version 52.0.

Google App Engine is still running on JDK 7 and you have uploaded a compiled version using JDK8. Please compile using JDK 7 and the problem will disappear.

Answer 3

About the first error

Please enter code: Either the access code is invalid or the OAuth token is revoked.Details: invalid_grant

It disappeared while trying to solve the other problems, i don't know what was the cause.

For the second

java.lang.RuntimeException: Cannot get the System Java Compiler. Please use a JDK, not a JRE.

I solved this by changing the value of environment variable PATH, putting jdk directory before anything else.

For the third:

Uncaught exception from servlet java.lang.UnsupportedClassVersionError: org/apache/jsp/guestbook_jsp : Unsupported major.minor version 52.0

The answer provided by Christopher Ebejer is correct. Now the examples work both with maven that with netbeans.

Many thanks.

Answer 4

When running mvn appengine:update and you get this:

"Either the access code is invalid or the OAuth token is revoked.Details: invalid_grant"

and then nothing, you need to delete

~/.appcfg_oauth2_tokens_java

On running the command again the browser will launch and ask you to login (to your google app engine account). After login you will get a code to paste into the command line...