Intro to Tomcat6

8/3/2019 Intro to Tomcat6

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INTRODUCTION TO APACHE TOMCAT 6

Filip Hanik

Covalent Technical TeamMember Apache Software Foundation

May 2007


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Who am I?

[email protected]

Tomcat Committer / ASF memberCo-designed the Comet implementation

Implemented NIO connector in 6Responsible for session replication andclustering

Been involved with ASF since 2001

Covalent Geek
mailto:[email protected]:[email protected]


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The Source for Apache, Tomcat,Geronimo & Axis

Covalent is the Leading Provider of Supportfor Apache Software Foundation OpenSource Projects, Namely Tomcat, Geronimo,Axis, & Apache, the World's Leading WebServer*

Covalent is One of the Few Sources of FullCommercial Support for Apache, Axis,Geronimo & Tomcat on a Global Basis

Covalent Currently Supports More Than 50%of Fortune 500 and 20% of Global 2000Companies

*62% global Web server marketshare ~Netcraft April 2006 Web Server Survey


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Who is Tomcat?

Top Level Project tomcat.apache.org24 committers on file

Active/core group is much smaller


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Agenda

History

Tomcat Versions

Development/Release Lifecycle

New Features

How to upgrade

Q & A


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History

Started out as a reference implementation by SunMicrosystems

Donated to ASF Tomcat 3 (roughly 1999)

Tomcat 4 New Specs & First Rewrite Codename Catalina

Tomcat 5.0 New SpecsTomcat 5.5 2nd Rewrite Performance

Tomcat 6.0 New Specs, New Cool Features


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History

Actively developed

In average 1 release/month

10+ active committers600.000 downloads/month (not countingmirrors)


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Versioning

Servlet/

JSP Spec

Tomcat

version JDK Version

2.5 2.1 6.0.x JDK 1.5+

2.4 2.0 5.0.x, 5.5.x JDK 1.4+

2.3 1.2 4.1.x JDK 1.3+

2.2 1.1 3.3.x JDK 1.2+ (?)


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Development Lifecycle

Development mainly driven by

JSR Specifications

Servlet

JSPExpression Language

Competitor Features

Committer Ideas

User Ideas


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Committers work on areas of personal

interestNo corporate driving force

Most Committers are sponsored by theiremployer to work on Tomcat

Employer respects the time as ASF hat

Commit-Then-Review

Check in what youve done, if its wrong

someone will complain


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Larger changes are discussed on mailinglist until consensus has been reached

Most commits are reviewed, few are everslipped in without review

Rarely are timelines for features discussed


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Release Process

Average 1 release per month

Across all versions

Release managed by release manager

Volunteer within the committercommunity

Release scheduled whenenough has been done

Important security issues are discovered

and fixed


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Release Process

What dictates stable releaseAll TCK tests pass

Around 500 test cases

Candidate binaries have been tested bycommunity in various environments andfeedback has been received

3x +1 votes during a stability vote


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Tomcat 6 Whats New

New Servlet Spechttp://java.sun.com/products/servlet/

Maintenance release

Mostly clarifications

Requires minimum JDK 1.5

Must support annotationsweb.xml is no longer required

And other minor changes
http://java.sun.com/products/servlet/http://java.sun.com/products/servlet/


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Tomcat 6 Whats New

Annotations support

Alternatives to some XML entries in web.xml

@Resource:Class or variable resource injection request

@Resources:

Similar as@Resource

but holds the array or@Resourceannotations

@RunAs:

Used to replace entries in web.xml@DeclareRoles:Alternative to in web.xml

Come from JSR 250 (Common Annotations forthe Java Platform)


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Tomcat 6 Whats New

Away with web.xmlFile is no longer required to be awebapp

All you need is war file or directory in thewebapps dir


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Tomcat 6 Whats New

New JSP Spec

http://java.sun.com/products/jsp/

New unified expression language

And it has its own specJspApplicationContext

New TLD handling (deferredexpressions)

Annotations

Resource Injection
http://java.sun.com/products/jsp/http://java.sun.com/products/jsp/


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Tomcat 6 Whats New

Shared (Injectable) Thread Pool Support

server.xml


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Tomcat 6 Whats New

New Java NIO Connector


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Tomcat 6 Whats New

Allow multiple url-pattern in servlet-mapping

OneFancyServlet

/foo/*

/bar/*


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Tomcat 6 Whats New

Smaller logging framework

Tomcat JULIBased on java.util.logging

Can be replaced with commons-loggingadapter (built through ant f extras.xml)

Maven repo

Currently using ASF staging repoOnce some quirks are fixed, all usefulTomcat jars will be deployed to ASFmain maven repo


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Tomcat 6 Whats New

New subversion layout

Simple tobuild yourself

Reduced distrosize

Removal of

obsolete items


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Tomcat 6 Whats New

How to build yourself

1. JDK 1.5, ant and svn installed

2. svn co

http://svn.apache.org/repos/asf/tomcat/tc6.0.x/tr

unk trunk

3. cd trunk4. ant download

5. ant

Binaries in trunk/output/buildDownloads into /usr/share/java

Change in build.properties.default


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Tomcat 6 Whats New

New distribution layout

common/*, server/*, shared/* are gone

Replaced by lib

ClassLoader directories can still beconfigured throughconf/catalina.properties

Windows Service Wrapper available in 32and 64 bit formats

Distributions are smaller


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Tomcat 6 Whats New

Web Services support (JSR 109)

Tomcat provides factories for JSR 109which may be used to resolve webservices references.Place the generated catalina-ws.jar as well as jaxrpc.jarand wsdl4j.jar (or anotherimplementation of JSR 109)in the Tomcat /lib/ folder.


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Tomcat 6 Whats New

Windows InstallerInstalls and setup the Tomcat as a Windows service

Optionally download native tcnative-1.dll component

located at heanet.ie


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Tomcat 6 Quickies

Comet aka Zero Latency HTTP

Ability to do server push instead of thetraditional client poll

Keeps connection openAbility to be handled asynchronously

Single thread thousands ofconnections

Servlet that implements

CometProcessor interface


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Tomcat 6 Quickies

Different Connectors

HTTP Connector protocol=o.a.coyote.http11.Http11Protocolo.a.coyote.http11.Http11AprProtocolo.a.coyote.http11.Http11NioProtocol

HTTP/1.1 aliased to Http11 and Http11AprDepending on PATH or LD_LIBRARY_PATHsettings

AJP Connectororg.apache.jk.server.JkCoyoteHandlerorg.apache.coyote.ajp.AjpAprProtocolAJP/1.3 aliased to the two above

Depending on PATH or LD_LIBRARY_PATHsettings


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Tomcat 6 - Quickies

log4j support

ant f extras.xml

cp output/extras/tomcat-juli.jar to

/bin (replace)cp output/extras/tomcat-juli-adapters.jar to/lib

For log4j

cp log4j.jar to /lib

cp log4j.properties to /lib


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Tomcat 6 - Quickies

Additional Windows Service Support

Java Service WrapperIndependent from ASF

Additional features that are not available

with Tomcats wrapper (like threaddumps)

http://wrapper.tanukisoftware.org/Sample install/download

http://people.apache.org/~fhanik/wrapper.html

T t 6
http://wrapper.tanukisoftware.org/http://wrapper.tanukisoftware.org/


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Tomcat 6 In the Enterprise

Fully supported by CovalentCovered under existing Tomcat supportplans

Currently support ASF version

Next major ERS will include Tomcat 6

6.0.13 or higher is right around the corner

T t 6


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Tomcat 6 In the Enterprise

Tomcat 6 is not a rewriteStability and Performance improvementsfrom 5.5

6.0 is slowly becoming maintenance branch

Only new features around Comet are goinginto 6.0.x

6.x has not yet been mapped out


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Upgrading to Tomcat 6

Easy from 5.0 and 5.5

Almost seamlessJust mind any extra additions you might haveadded into commons/lib, shared/lib etc

Harder from 3.3 and 4.1Major spec changes

Major layout changes

Recommendation

Start with fresh 6.0 server.xml, dont reuseyour old one

Same for other Tomcat config files


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Thank You

[email protected]

For support information contact Covalent

[email protected],[email protected]

www.covalent.com

800/444-1935 or 925/974-8800

Question and Answer time!!
mailto:[email protected]:[email protected]:[email protected]://www.covalent.com/http://www.covalent.com/mailto:[email protected]:[email protected]:[email protected]


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