tomcat versions and book

[gayathri sridhar]

Hi Budi,

As tomcat undergoes revision,
version 4.x 5.x and now 5.5, what part of the container gets rewritten /improved upon. Is 5.x a complete rewrite of 4.x?
Does the book cover 5.x as well?

thanks,
gayathri

[Ko Ko Naing]

Your question had been answered in that thread in the past... I guess, you might have missed that thread, in which Alvin asked a lot of questions about the book...

Hope it helps...

[somkiat puisungnoen]

Is 5.x a complete rewrite of 4.x?

My question :: No.

I think, Tomcat should be use CORE System in all/almost version.

Don't use rewrite , use Reuse is ok.

And you can see more detail at :: http://cvs.apache.org/viewcvs.cgi/#dirlist

[Budi Kurniawan]

The book covers Tomcat 4 and 5. 5 is not a complete rewrite of 4. The main difference is that tomcat 5 supports Servlet 2.4 and JSP 2.0, while 4 supports Servlet 2.3 and JSP 1.2.

Internally, the servlet container in 5 is more efficient. For example, in 4 each component that needs background processing has its own thread. In 5 one thread is shared by all the components.

Some background processing tasks include:
1. invalidating expired session objects.
2. reloading an application whose web.xml or one of its classes has changed.

etc...

This is one of the topics "How Tomcat Works" discusses in detail.

[gayathri sridhar]

Originally posted by Ko Ko Naing:
Your question had been answered in the past...

thanks . It does answer a part of my question. But it seems to be more of a conversation between you and alvin. and yes and i was curious about the container module that normally gets rewritten.