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Unintended regular expression
String[] valueSegments 
= value.split("."); // NOI18N
21
Extract data from pdf to excel - extract form data from PDF in C#.net, ASP.NET, MVC, Ajax, WPF
Help to Read and Extract Field Data from PDF with a Convenient C# Solution
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Extract data from pdf to excel - VB.NET PDF Form Data Read library: extract form data from PDF in vb.net, ASP.NET, MVC, Ajax, WPF
Convenient VB.NET Solution to Read and Extract Field Data from PDF
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Field Self Assignment
public TagHelpItem(String name, String file, 
String startText, int startOffset, 
String endText, int endOffset,
String textBefore, String textAfter){
this.name = name;
this.file = file;
this.startText = startText;
this.startTextOffset = startTextOffset;
 this.endText = endText;
 this.endTextOffset = endTextOffset;
this.textBefore = textBefore;
this.textAfter = textAfter;
this.identical = null;
}
22
VB.NET Create PDF from Excel Library to convert xlsx, xls to PDF
Image: Insert Image to PDF. Image: Remove Image from PDF Page. Image: Copy, Paste, Cut Image in Page. Data: Read, Extract Field Data. Data: Auto Fill-in Field
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VB.NET PDF Text Extract Library: extract text content from PDF
PDF ›› VB.NET PDF: Extract PDF Text. VB.NET PDF - Extract Text from PDF Using VB. How to Extract Text from PDF with VB.NET Sample Codes in .NET Application.
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23
Bad Naming
package org.eclipse.jface.dialogs;
public abstract class Dialog extends Window {
protected Button getOKButton() {
return getButton(IDialogConstants.OK_ID);
};
}
public class InputDialog extends Dialog {
protected Button getOkButton() {
return okButton;
};
}
Wrong capitalization
C# PDF Image Extract Library: Select, copy, paste PDF images in C#
Image: Extract Image from PDF. |. Home ›› XDoc.PDF ›› C# PDF: Extract PDF Image. How to C#: Extract Image from PDF Document.
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C# PDF Text Extract Library: extract text content from PDF file in
XDoc.PDF ›› C# PDF: Extract PDF Text. C# PDF - Extract Text from PDF in C#.NET. Feel Free to Extract Text from PDF Page, Page Region or the Whole PDF File.
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24
Confusing/bad naming
Methods with identical names and signatures
but different capitalization of names
could mean you don’t override method in 
superclass
confusing in general
Method name same as class name
gets confused with constructor
VB.NET PDF Image Extract Library: Select, copy, paste PDF images
Image: Extract Image from PDF. |. Home ›› XDoc.PDF ›› VB.NET PDF: Extract PDF Image. VB.NET PDF - Extract Image from PDF Document in VB.NET.
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C# Create PDF from Excel Library to convert xlsx, xls to PDF in C#
Create PDF from Excel. |. Home ›› XDoc.PDF ›› C# PDF: Create PDF from Excel. Export PDF from Excel with cell border or no border.
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Bad naming in BCEL
(shipped in jdk1.6.0-b29)
/** @return a hash code value 
*for the object.
*/
public int hashcode() { 
return basic_type.hashCode() 
^ dimensions; }
25
C# PDF Page Extract Library: copy, paste, cut PDF pages in C#.net
Page: Extract, Copy and Paste PDF Pages. Easy to Use C# Code to Extract PDF Pages, Copy Pages from One PDF File and Paste into Others in C#.NET Program.
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VB.NET PDF Page Extract Library: copy, paste, cut PDF pages in vb.
VB.NET: Extract PDF Pages and Save into a New PDF File. You VB.NET: Extract PDF Pages and Overwrite the Original PDF File. Instead
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26
Ignored return values
Lots of methods for which return value 
always should be checked
E.g., operations on immutable objects
// Eclipse 3.0.0M8
String name= workingCopy.getName();
name.replace(’/’, ’.’);
Ignored Exception Creation
/**
* javax.management.ObjectInstance
* reference impl., version 1.2.1
**/
public ObjectInstance(ObjectName objectName, 
String className) {
if (objectName.isPattern()) {
new RuntimeOperationsException(
new IllegalArgumentException(
"Invalid name->"+ objectName.toString()));
}
this.name = objectName;
this.className = className;
}
27
28
Inconsistent Synchronization
Common idiom for thread safe classes is to 
synchronize on the receiver object (“this”)
We look for field accesses
Find classes where lock on “this” is sometimes, 
but not always, held
Unsynchronized accesses, if reachable from 
multiple threads, constitute a race condition
29
Inconsistent Synchronization 
Example
GNU Classpath 0.08, java.util.Vector
public int lastIndexOf(Object elem)
{
return lastIndexOf(elem, elementCount – 1);
}
public synchronized int lastIndexOf(
Object e, int index)
{
...
}
30
Unconditional Wait
Before waiting on a monitor, the condition should 
be almost always be checked
– Waiting unconditionally almost always a bug
– If condition checked without lock held, could miss the 
notification
Example (JBoss 4.0.0DR3):
if (!enabled) {
try {
log.debug(...);
synchronized (lock) {
lock.wait();
}
condition can 
become true after it 
is checked
but before the 
wait occurs
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