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Daemon thread :

Are service providers for other threads running in the same process.

Thread that works in the background to support the runtime environment are called Daemon Thread:"

Runs...

If you take 3 tier architecture

Browser (1st tier) <-----> webserver/webapplication (2nd tier) <----->
Application server/EJB application


Here browser is the web client/ thin client
And...

Serilization is the process of writing the state of the object to a byte stream.

This is usefull when you want to save the state of your program in a persistence storage area.

Serializable :...