Java programming with findbugs and checkstyle

Improving your Java Code with FindBugs and Checkstyle
By Gunith Devasurendra
(A FOSS Activist, A Virtusan, An APIIT Alumni, An Old Royalist and A Programmer)

Defects!
Something wrong in the software
Reason for QA!
A Few Types of Defects in Software
Requirement Based Defects
Technical Defects
Style Defects (??)

Technical Defects
Anomalies in code
Can be found by reading the pattern of code – Bug Patterns!
Can be automatically found!
2 Tools for capturing Java tech defects
FindBugs – A static analysis tool
PMD – A dynamic analysis tool

FindBugs
An Open Source Project by The University Of Maryland
Distributed under the terms of the Lesser GNU Public License
http://findbugs.sourceforge.net

Bugs @ FindBugs
Categorizes more than 300 bug types
Every bug has a priority rating:
High –> P1
Medium -> P2
Low -> P3
Every bug has a Category, such as such as "Malicious Code," "Bad Practice," and "Performance."
Full List: http://findbugs.sourceforge.net/bugDescriptions.html

Checkstyle
Automate Coding standards:
to maintain code consistency across teams and the times
Ensure better coding practices
Use
Sun Coding Standard OR
Can be customized to suit your project’s coding standard
http://checkstyle.sourceforge.net/

Checkstyle Defects
Comments: Javadoc
Naming conventions: Class names, Var names, Constants
Indentation: Spaces over tabs
Declarations:
Statements:
Best practices:
Use the final keyword for variables and parameters that will not need to be modified.
Don't declare variables within loops

Advantages of using Code Analysis Tools
Understand Errors Early, before our client does
Helper for Code Reviewers
Learning Best Practices

Links4U
http://findbugs.sourceforge.net
http://checkstyle.sourceforge.net/
http://www.devx.com/Java/Article/38735/1954
http://www.devx.com/architect/Article/31071/0

Java programming with findbugs and checkstyle

by Gunith Devasurendra

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