http://code.google.com/appengine/docs/java/overview.html :
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. http://code.google.com/appengine/docs/java/runtime.html : By default, each web server processes only one request at a time. If you mark your application as thread-safe, App Engine may dispatch multiple requests to each web server in parallel. To do so, simply add a <threadsafe>true</threadsafe> element to appengine-web.xml as described in Using Concurrent Requests<http://code.google.com/appengine/docs/java/Using_Concurrent_Requests> . -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
