title: Singleton objects and Java servlets
body: <p>When I access a singleton Java object from withing a servlet, that object is only "single" or "one instance" for the give servlet thread or single throughout the JVM on the Server OS (like Linux)? </p>
  
  <p>I mean when client connects to the servlet/service, are singleton object are unique to each thread created for each client or its unique throughout the whole JVM installed in the machine?  </p>