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Squashing Bugs 
with Static Analysis
William Pugh
Univ. of Maryland
http://www.cs.umd.edu/~pugh
/
http://findbugs.sourceforge.net
/
SD Best Practices, 
2006
FindBugs
™
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Help to Read and Extract Field Data from PDF with a Convenient C# Solution
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Convenient VB.NET Solution to Read and Extract Field Data from PDF
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FindBugs
•
Open source static analysis tool for finding 
defects in Java programs
•
Analyzes classfiles
•
Generates XML or text output
•
can run in Netbeans/Swing/Eclipse/Ant/SCA
•
Total downloads from SourceForge: 274,291+
2
C# PDF Text Extract Library: extract text content from PDF file in
class. Able to extract and get all and partial text content from PDF file. Ability to extract highlighted text out of PDF document.
how to extract data from pdf to excel; filling out pdf forms with reader
VB.NET PDF Text Extract Library: extract text content from PDF
NET Programming. Extract and get partial and all text content from PDF file. Extract highlighted text out of PDF document. Image text
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What is FindBugs?
•
Static analysis tool to find defects in Java code
•
not a style checker
•
Can find hundreds of defects in each of large apps such 
as Bea WebLogic, IBM Websphere, Sun's JDK
•
real defects, stuff that should be fixed
•
hundreds is conservative, probably thousands
•
Doesn’t focus on security
•
lower tolerance for false positives
3
C# HTML5 PDF Viewer SDK to view PDF document online in C#.NET
Extract Field Data. Data: Auto Fill-in Field Data. Field: Insert VB.NET convert PDF to text, VB.NET extract PDF pages, VB Support to zoom in and zoom out PDF page
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VB.NET PDF- View PDF Online with VB.NET HTML5 PDF Viewer
Extract Field Data. Data: Auto Fill-in Field Data. Field: Insert file & pages edit, C#.NET PDF pages extract, copy, paste Support to zoom in and zoom out PDF page
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Common Wisdom 
about Bugs
•
Programmers are smart
•
Smart people don’t make dumb mistakes
•
We have good techniques (e.g., unit testing, pair 
programming, code inspections) for finding bugs 
early
•
So, bugs remaining in production code must be 
subtle, and require sophisticated techniques to 
find
4
C# PDF Form Data fill-in Library: auto fill-in PDF form data in C#
Able to fill out all PDF form field in C# RasterEdge XDoc.PDF SDK package provides PDF field processing features for will learn how to fill-in field data to PDF
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C# WPF PDF Viewer SDK to view PDF document in C#.NET
Extract Field Data. Data: Auto Fill-in Field Data. Field: Insert & pages edit, C#.NET PDF pages extract, copy, paste, C# Abilities to zoom in and zoom out PDF page
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Would You Write Code 
Like This?
if (in == null)
try {
in.close();
...
•
Oops
•
This code is from Eclipse (versions 3.0 - 3.2)
•
You may be surprised what is lurking in your 
code
5
VB.NET PDF - View PDF with WPF PDF Viewer for VB.NET
Extract Field Data. Data: Auto Fill-in Field Data. Field: Insert & pages edit, C#.NET PDF pages extract, copy, paste, C# Abilities to zoom in and zoom out PDF page
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VB.NET PDF- HTML5 PDF Viewer for VB.NET Project
Extract Field Data. Data: Auto Fill-in Field Data. Field: Insert VB.NET convert PDF to text, VB.NET extract PDF pages, VB PDF page and zoom in or zoom out PDF page
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6
Why Do Bugs Occur?
•
Nobody is perfect
•
Common types of errors:
•
Misunderstood language features,  API methods
•
Typos (using wrong boolean operator, forgetting 
parentheses or brackets, etc.)
•
Misunderstood class or method invariants
•
Everyone makes syntax errors, but the compiler 
catches them
•
What about bugs one step removed from a syntax error?
VB.NET PDF - WPF PDF Viewer for VB.NET Program
Field Data. Data: Auto Fill-in Field Data. Field: Insert & pages edit, C#.NET PDF pages extract, copy, paste rotate PDF pages, zoom in or zoom out PDF pages and go
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VB.NET PDF File & Page Process Library SDK for vb.net, ASP.NET
Moreover, when you get a PDF document which is out of order, you need to adding a page into PDF document, deleting unnecessary page from PDF file and changing
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Bug Patterns
Infinite recursive loop
•
Student came to office hours, was having trouble 
with his constructor:
/** Construct a WebSpider */
public WebSpider() {
WebSpider w = new WebSpider();
}
•
A second student had the same bug
•
Wrote a detector, found 3 other students with 
same bug
8
Double check against JDK
•
Found 4 infinite recursive loops
•
Including one written by Joshua Bloch
public String foundType() {
return this.foundType();
}
•
Smart people make dumb mistakes
•
Embrace and fix your dumb mistakes
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jdk1.0.2
j2sdk1_3_1_03
j2sdk1.4.0-b72
j2sdk1.4.0-b82
j2sdk1.4.1-b06
j2sdk1.4.1-b14
j2sdk1.4.2-b06
j2sdk1.4.2-b14
j2sdk1.4.2-b20
j2sdk1.4.2_04
j2sdk1.5.0-b12
j2sdk1.5.0-b20
j2sdk1.5.0-b28
j2sdk1.5.0-b36
j2sdk1.5.0-b44
j2sdk1.5.0-b51
j2sdk1.5.0-b58
j2sdk1.5.0-b64
jdk1.5.0_04
jdk1.6.0-b13
jdk1.6.0-b17
jdk1.6.0-b26
jdk1.6.0-b30
jdk1.6.0-b34
jdk1.6.0-b38
jdk1.6.0-b42
jdk1.6.0-b46
jdk1.6.0-b50
jdk1.6.0-b54
jdk1.6.0-b58
jdk1.6.0-b62
jdk1.6.0-b66
jdk1.6.0-b70
jdk1.6.0-b74
jdk1.6.0-b78
jdk1.6.0-b82
active
dead
I inform Sun of 
infinite recursive 
loops in their code
JDK build
Infinite Recursive 
Loops: Sun JDK history
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