greetings siddharth!
all applications are run from a secure JVM. on the overview page of
the official documentation, we state the following:
The JVM runs in a secured "sandbox" environment to isolate your
application for service and security. The sandbox ensures that apps
can only perform actions that do not interfere with the performance
and scalability of other apps. For instance, an app cannot spawn
threads, write data to the local file system or make arbitrary network
connections. An app also cannot use JNI or other native code. The JVM
can execute any Java bytecode that operates within the sandbox
restrictions.
for your example of System.exit(), that calls is disabled in the JVM
so it has no effect.
for more information, please see:
http://code.google.com/appengine/docs/java/runtime.html#The_Sandbox
hope this helps!
-- wesley
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"Core Python Programming", Prentice Hall, (c)2007,2001
"Python Fundamentals", Prentice Hall, (c)2009
http://corepython.com
wesley.j.chun :: [email protected]
developer relations :: google app engine
On Dec 29, 10:28 pm, Siddharth <[email protected]> wrote:
> Hi, My question is about the design/architecture of Google app engine
> so i expect someone from the core team to answer this question.
> In my application, Google allows me to write any kind of code (say for
> example in Java) and finally this code is executed in a jvm which is
> shared accross applications. Now my question is how does google app
> engine ensures isolation for an application inside the shared JVM?
> Putting my question differently if i write any malicious code (for
> example System.exit(), introducing memory leak etc) in my application
> and upload to the google app engine, what will happen? I am sure
> google already handles this but my question is how?
>
> Regards,
> Siddharth
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