Who Needs Containers Anyway?

Dmitry BuzdinJava User Group Latvia

Today we will talk about containers...

Java is all about containers, right?

Lightweight Container

Heavyweight Container

Enterprise Container

Who uses containers?

Why do you use them?

I use Container Because:

• <Reason 1>

• <Reason 2>

• <Reason 3>

• <Reason 4>

• <Reason 5>

• <Reason 6>

Data and Code Integrity

Centralized Configuration

Security

Performance

Total Cost of Ownership

Transaction Support

http://en.wikipedia.org/wiki/Application_server

Thread Management

Log Management

Hot Redeploys

Application Monitoring

Distributed Environment

Clustering

Multiple Apps on one Server

What if you have only one application?

multiple apps

centralized configs

hot-redeploys

distributed environment

Can I live without the container?

Should I write my own Web Server?

Perhaps not.

Http Server OnlySupports Servlets

Runs Spring

Used in Play! and Elastic Search

Grizzly

Supports Servletsand more...

Simple - Jetty

Extensible - Netty

Oracle - Grizzly

We can start an app without the container!

... so what?

Simplicity

Flexibility

Performance

Development Speed

Why now?

Browser

ServerJSP Servlet

HTMLGET/POST

Browser

ServerREST

JSONGET/POST

JQuery

Browser

Server

HTMLGET

Browser

Server

JSONGETAJAXWEB SOCKETS

1 user != 1 thread

Browser

JSONGET

Browser

QUEUE

Java NIO

Event-Driven

Non-Blocking

Asynchronous

Back to Client-Server

Your app should run in Jetty

The world is async

Ignore JavaEE** if you can

JAR

Questions

References

http://jetty.codehaus.org/jetty/

http://netty.io/

http://grizzly.java.net/

Recognized these words?Write to

dmitry@livesheets.comfor the next steps