> From: John Smith [mailto:tomcat.ran...@gmail.com] > Subject: Concurrency - Servlet created instances accessing static classes
> Assume the following: > 1. Servlet receives an HTTP POST request. doPost(...) is called. > 2. doPost(..) instantiates class X with each request First terminology problem: class X isn't instantiated here, an object of type class X is instantiated. > 3. Class X calls a static method of class Y Second terminology problem: classes don't make calls, threads do. > Assuming I have no synchronization in the method signature or body of Y, > there is a danger of concurrency issues or thread safety issues. Many > instances of X can call Y's static method at the same time, causing BAD > THINGS to happen. The type, state, or condition of X is irrelevant; it's the fact that multiple threads may be calling Y's static method concurrently that is the issue. Whether or not that is safe is entirely dependent on the code inside Y. - Chuck --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
