App Engine "sandbox" environment imposes some restrictions on what can be done. As it is stated in public documentation [1]: "... you must use one of the methods on ThreadManager to create your threads. You cannot invoke new Thread() yourself or use the default thread factory <http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/Executors.html#defaultThreadFactory> ."
...and that is what ServerMonitor.java is trying to do [2]. It looks like if a a workaround exists, it will not be trivial [3]. [1] https://cloud.google.com/appengine/docs/java/#Java_The_sandbox [2] http://grepcode.com/file/repo1.maven.org/maven2/org.mongodb/mongo-java-driver/2.12.3/com/mongodb/ServerMonitor.java#66 [3] http://stackoverflow.com/questions/25216069/google-app-engine-and-mongodb > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at http://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/e3a4da01-68ed-490c-8d68-76a2e7a5320a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.