CODEWITHSUNDEEP
javagoogle-app-enginegoogle-cloud-platformcron
Chris Halcrow
Chris Halcrow

Reputation: 31950

Google Cloud App Engine cron job - not calling the service

I've successfully deployed a Cron job to App Engine, for a Java application using the App Engine Standard environment. It deploys successfully, however the cron job fails, and when I check the log, it isn't calling the correct service:

"GET /my-app HTTP/1.1" 404 - - "AppEngine-Google; (+http://code.google.com/appengine)"
"my-project.appspot.com"

Other cron jobs that are working look like this (note that the last part shows the service name and not just the project name):

"GET /my-app HTTP/1.1" 404 - - "AppEngine-Google; (+http://code.google.com/appengine)"
"my-service.my-project.appspot.com"

Here is my cron.xml:

<?xml version="1.0" encoding="UTF-8"?>
<cronentries>
    <cron>
        <url>/my-app</url>
        <description>my app</description>
        <schedule>every 1 minutes from 00:00 to 23:00</schedule>
        <timezone>Europe/Paris</timezone>
    </cron>
</cronentries>

And my web.xml:

<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

  <servlet>
      <servlet-name>my-app</servlet-name>
      <servlet-class>com.my.package.MyApp</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>my-app</servlet-name>
      <url-pattern>my-app</url-pattern>
  </servlet-mapping>


</web-app>

And my servlet definition (this is a Cloud Endpoint app, which uses a Java servlet):

@WebServlet(
        name = "my-app",
        urlPatterns = {"/my-app"}
)
public class MyApp extends HttpServlet {
   ...

And my appengine-web.xml:

<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
  ....    

  <application>my-project</application>
  <service>my-app</service>

  ....

</appengine-web-app>

Why isn't the cron job calling the service? The service is also correctly deployed.

Upvotes: 1

Views: 724

Answers (2)

rajesh-nitc
rajesh-nitc

Reputation: 5539

From the official docs:

The following example creates a basic cron job that runs daily:

<?xml version="1.0" encoding="UTF-8"?>
<cronentries>
  <cron>
    <url>/tasks/summary</url>
    <target>beta</target>
    <description>daily summary job</description>
    <schedule>every 24 hours</schedule>
  </cron>
</cronentries>

The target specification is optional and is the name of a service/version. If present, the target is prepended to your app's hostname, causing the job to be routed to that service/version. If no target is specified, the job will run in the versions of the default service that are configured for traffic.

I think this is what is happening in your case. Since you have not specified the target, the cron job is hitting the /my-app route on default service. Mention the service name in the target.

Upvotes: 1

Chris Halcrow
Chris Halcrow

Reputation: 31950

My cron.xml needed a <target> that matches the <service> in my appengine-web.xml

cron.xml

<?xml version="1.0" encoding="UTF-8"?>
<cronentries>
    <cron>
        <url>/my-app</url>
        <!-- <target> required -->
        <target>my-app</target>
        <description>my app</description>
        <schedule>every 1 minutes from 00:00 to 23:00</schedule>
        <timezone>Europe/Paris</timezone>
    </cron>
</cronentries>

appengine-web.xml

<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
  ....    

  <application>my-project</application>
  <!-- cron <target> must match service -->
  <service>my-app</service>

  ....

</appengine-web-app>

Upvotes: 2

Related Questions