Question

Is there any good profiler which support Google App Engine? I need to capture each methods call and their object creation. I have checked JProfiler, but it not supported methods level profiling.

Thanks

Answer 1

One way to profile in Google App Engine is using the AppstatsServlet.
Add the following to your web.xml

<!-- AppStats start -->
<filter>
    <filter-name>appstats</filter-name>
    <filter-class>com.google.appengine.tools.appstats.AppstatsFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>appstats</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
    <servlet-name>appstats</servlet-name>
    <servlet-class>com.google.appengine.tools.appstats.AppstatsServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>appstats</servlet-name>
    <url-pattern>/appstats/*</url-pattern>
</servlet-mapping>

<security-constraint>
    <web-resource-collection>
        <url-pattern>/appstats/*</url-pattern>
    </web-resource-collection>
    <auth-constraint>
        <role-name>admin</role-name>
    </auth-constraint>
</security-constraint>
<!-- AppStats end -->   

and after perusing the pages that you want to profile, hit http://yourappname.appspot.com/appstats/stats with your browser. However it’s profiling the API, but might be useful to you. In general object creation is orders of magnitude faster than API calls…

Google documentation for Java AppStat.