Transcript Document

Java Developer Conference
June 6-9, 2000
Conference Report
Gregor Hohpe
Why Attend Conferences?
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Catch up on technology & innovation
Get the inside scoop from the source
Understand future directions / plans
See product demos
Network with peers
Recruit
Get into a new mind set
Have fun
The Facts
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5th year
25,000 attendees from 100 countries
200+ Conference sessions
10 Tracks
100+ Birds of a feather sessions
4 days, 50+ hours (6:00am – 12:00 mid)
2 million Java developers worldwide, second only to
Visual Basic
Key Take-Away
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1 backpack
1 denim shirt
3 T-shirts
2 stuffed animals (Duke)
1 cable turtle
1 mini radio
1 Java smart-card
1 pen
1 screen de-duster
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1 hat
1 stress reliever
4 magazines
1 flashlight
5 demo CDs
1 chocolate bar
Gregor’s Top 10 Observations
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Scott McNealy is a politician
It’s more about what’s cool than what’s commercially available or
robust
3. There is a lot of propaganda & “announceware”
4. “You guys are too busy putting Java in light bulbs, rather than
making the existing JDK more robust”
5. Don’t underestimate Big Blue
6. Java programs have the worst user interfaces
7. Sun is dancing around the open source issue
8. We consultants don’t know squat about programming
9. There is a lot more to Java than the language itself
10. 25,000 people are too much for Moscone
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Major Themes
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New platforms / devices (J2ME, KVM)
New tools
J2EE / EJB
Scalable Web applications
XML
Performance
Object Oriented Design / Frameworks
Language Evolution
Open Source / Java Community Process
New Tools
• Webgain
– Venture formed by Warburg & BEA
– Licensed Café Enterprise, StructureBuilder, TopLink,
Macromedia DreamWeaver
– Remote EJB Debugging, JSP generation from DreamWeaver
– 5k for basic suite (no TopLink), 9k full suite
– www.webgain.com
• Macromedia
– DreamWeaver Ultradev
– JSP code generation
– Useful only for 2-tier apps
• BEA Developer Program
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J2EE
• EJB 2.0 Draft released
– Enhanced CMP
– Message Bean
• Presentation Logic / Business Logic separation through
JSP custom tags
• Fine-grained EJB vs. EJB facade
– Fine-grained substantial overhead, but can use CMP
(container managed persistence)
– Need container for development & debugging
• Where does the business logic live?
– JSP, Session Bean, Entity Bean
• New EJB architecture patterns
– www.theserverside.com
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Scalable Web Apps
• Everything is transparent – until you talk about
performance (sometimes factor 1000 or more)
• Performance:
– Connection Rate
– Request Rate
– Throughput
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– Scalability
– Latency
Distributed transactions are expensive
Marshalling/serialization is expensive
Value Objects accessed from JSP
Lazy loading of objects (composition vs. aggregation)
Use load test tools
XML
• XML widely adopted, tools available
• Syntax is defined, semantic not yet (tags)
• XML Schema specs under development, DTDs most
widely used today
• XML parsers still evolving (e.g., Xpath)
• XSLT vs. JSP for XML translation (JSP custom tag)
• XSLT still moving target, little debug support
• XML data binding is interesting, but not yet available
• Resources (free / open source):
– xml.apache.org: Xerxes, Xalan
– www.ibm.com/developer/xml: XSLT editor
– www.w3.org/xml
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Performance
• To write efficient Java apps, need to understand how
VM / bytecode works
• Java compilers do not optimize
• “I like Java because I don’t have to worry about
memory” are famous last words
• JIT vs. static optimizer
• Garbage collection is an unsolved problem – ask
anyone who write a LISP interpreter
• Memory footprint more critical than computational
performance (swapping)
• Write clean code, then tune, use profiler
• Resources:
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– Peter Haggar: Practical Java Programming
Brownbag suggestions
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XML Technology Update
XML and Java
Developing High-Performance Java Applications
Inside the Java VM
JSP 1.1: Custom Tags & More
Refactoring
Evolution of the Java platform
EJB Specification Update
Web Architectures using J2EE
Design Patterns
Extreme Programming
Exciting awards are waiting for the authors!
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