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Duration of infinite recursive loop bugs in JDK
Sign pdf form reader - 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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Convenient VB.NET Solution to Read and Extract Field Data from PDF
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12
Hashcode/Equals
Equal objects must have equal hash codes
Programmers sometimes override equals() but not 
hashCode()
Or, override hashCode() but not equals()
Objects violating the contract won’t work in hash tables, 
maps, sets
Examples (53 bugs in 1.6.0-b29)
javax.management.Attribute
java.awt.geom.Area
C# WinForms Viewer: Load, View, Convert, Annotate and Edit PDF
PDF Protection. • Sign PDF document with signature. To view, convert, edit, process, protect, sign PDF files, please refer to XDoc.PDF SDK for .NET overview.
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C# WPF Viewer: Load, View, Convert, Annotate and Edit PDF
View PDF outlines. Related Resources. To view, convert, edit, process, protect, sign PDF files, please refer to XDoc.PDF SDK for .NET overview.
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Fixing hashCode
What if you want to define equals, but don't think 
your objects will ever get put into a HashTable?
Suggestion:
public int hashCode() {
assert false : "hashCode method not designed";
return 42;
}
13
C# PDF Digital Signature Library: add, remove, update PDF digital
Form Process. Data: Read, Extract Field Data. Data: Auto Fill-in Field Data. Field: Insert, Delete, Update Field. Use C# Demo to Sign Your PDF Document.
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C# HTML5 Viewer: Load, View, Convert, Annotate and Edit PDF
HTML5 Viewer for C# .NET. Related Resources. To view, convert, edit, process, protect, sign PDF files, please refer to XDoc.PDF SDK for .NET overview.
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14
Null Pointer Dereference
Dereferencing a null value results in 
NullPointerException
Warn if there is a statement or branch that if executed, 
guarantees a NPE
Example:
// Eclipse 3.0.0M8
Control c = getControl();
if (c == null && c.isDisposed())
return;
C# HTML5 Viewer: Load, View, Convert, Annotate and Edit Word
users can convert Convert Microsoft Office Word to searchable PDF online, create To view, convert, edit, process, built, sign Word documents, please refer to
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VB.NET PDF Digital Signature Library: add, remove, update PDF
Link: Edit URL. Bookmark: Edit Bookmark. Metadata: Edit, Delete Metadata. Form Process. Use VB.NET Demo to Sign Your PDF Document. Add necessary references:
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15
More Null Pointer 
Dereferences
// Eclipse 3.0.0M8
String sig = type.getSignature();
if (sig != null || sig.length() == 1) {
return sig;
}
// JDK 1.5 build 42
if (name != null || name.length > 0) {
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How to C#: Quick to Start Using XImage.Raster
project’s reference. Add a new Form Item to the project, and choose to design mode sign. Make the ToolBox view show. Right click
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16
More Null Pointer 
Dereferences
javax.security.auth.kerberos.KerberosTicket, 1.5b42
// flags is a parameter
// this.flags is a field
if (flags != null) {
if (flags.length >= NUM_FLAGS)
this.flags = ...
else
this.flags = ...
} else
this.flags = ...
if (flags[RENEWABLE_TICKET_FLAG]) { 
XDoc.HTML5 Viewer for .NET, Zero Footprint AJAX Document Image
View, Convert, Edit, Sign Documents and Images. We are dedicated to provide powerful & profession imaging controls, PDF document, image to pdf files and
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How to C#: Create a Winforms Control
VB.NET How-to, VB.NET PDF, VB.NET Word, VB.NET Excel, VB.NET PowerPoint, VB.NET Tiff Add a new Form Item to the project, and choose to design mode sign.
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17
Redundant Null Comparison
Comparing a reference to null when it is definitely null 
or definitely non-null
Not harmful per se, but often indicates an inconsistency that 
might be a bug
Example (JBoss 4.0.0DR3):
protected Node findNode(Fqn fqn, ...) {
int treeNodeSize = fqn.size();
...
if (fqn == null) return null;
How should we fix this bug?
if (name != null || name.length > 0)
Should we just change it to
if (name != null && name.length > 0)
Will that fix it?
We have no idea. Obviously, we’ve never tested the 
situation when 
name
is null.
Try to write a test case first, then apply the obvious fix
18
Bad Binary operations
if ((f.getStyle () & Font.BOLD) == 1) {
sbuf.append ("<b>");
isBold = true;
}
if ((f.getStyle () & Font.ITALIC) == 1) {
sbuf.append ("<i>");
isItalic = true;
}
19
Doomed Equals
public static final ASDDVersion  
getASDDVersion(BigDecimal version) {
if(SUN_APPSERVER_7_0.toString()
.equals(version)) 
return SUN_APPSERVER_7_0;
20
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