Manning - Bitter Java - ...

Manning - Bitter Java - Anti-Patterns (2002), Java EE, Manning

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Process and performance
The same
problem
The same
problem
Isolated
problem
The same
problem
Antipattern
Refactored
solution
Refactoring
guide
Process
weakness
Protective Barrier
Solve antipatterns by finding a problem, establishing a
pattern, fixing the problem, and distributing the solution. Fix
the broken process to deploy a protective barrier. Read
about it in section 1.3.2, page 11.
Healthy
enterprise
Fast fail-safe
legacy app
configuration
Fast fail-safe
database
configuration
Data
Web app
server
Web app
server
Web app
server
Firewall
Web
server
Web
server
Web
server
Standby
Sprayer
Deploy high performance Internet
applications with redundant
sprayers and parallel services.
Read about it in section 10.1,
page 284.
Firewall
Internet
Triangle design pattern and related antipatterns
Command
JSP
10 KB Servlet
Servlet
Submit
Client
HTML
Among the most common antipatterns is the
magic servlet. In this bitter pill, a Submit button
triggers a massive servlet, with no logical
delineation of responsibilities. Read about it in
section 3.2, page 59.
Use the triangle design pattern to partition
the user interface and model. Unlike MVC
application, Java Internet applications have
an upstream and downstream view. Read
about it in chapter 3.
JSP
if (command.x = a){
Command
Command
HTML for a
JSP
else if (command.x = b){
Servlet
HTML for b
Servlet
}
Client
HTML
Client
HTML
Sometimes, utilities, model logic, or view logic
can creep into Fat commands. In this
antipattern, performance and maintenance
costs suffer. Read about them in section 4.5,
page 102.
Compound JSPs process too many decisions in
the JSP. Decision logic should be pushed into
the controller. Read about them in section 4.3,
page 88.
Bitter Java
BRUCE TATE
MANNING
Greenwich
(74° w. long.)
For Maggie
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ISBN 1-930110-43-X
Printed in the United States of America
12345678910– VHG – 05 04 03 02
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