I have one query. I have one j2ee server runing in solaris environment. I have one one library (jr file) that I have to update in the server. Without retsarting the server, Is it possible to update this jar file and the runing server will use this updated jar ? So far as I know that JVM can not take this updted jar until we restart it. The classloader can load this jar once we restart the server. But probably there must be a solution that I dont know and you know.