This issue was reported manually by sdedic.
It already has 7 duplicates 


Build: NetBeans IDE 7.1.1 (Build 201203012225)
VM: Java HotSpot(TM) Client VM, 10.0-b19, Java(TM) SE Runtime Environment, 1.6.0_05-b13
OS: Windows XP

User Comments:
GUEST: 1. Open project
 - Scanning projects automatically

2. Attempt to stop scan

FiruzzZ: too much time "Scanning proyects dependence" when Im just having 3 open, one very small and at last 10 files, 1 not much bigger with dependence to the 3rd (a small utility proyect)

GUEST: Fica mostrando a tarefa Analisando projetos... e nunca termina

GUEST: Trying to run j2ee samples

GUEST: The scanning process seems to be in an infinite loop. Has been hanging there for several minutes at 80% without any progress.

vieiro: So I have this plain JavaSE project with a single class of 30 lines and a single library (Oracle JDBC Driver) and "Scanning Projects" takes ages to complete.

This is not just intolerable, but it seems NetBeans is pulling my leg trying to scan a project with 30 lines of Java. It's not funny at all indeed.

This is for NB 7.1.1 on a Windows Box.




Stacktrace: 
java.lang.Exception: Scan canceled.
   at java.lang.Thread.getStackTrace(Thread.java:1426)
   at org.netbeans.modules.parsing.impl.indexing.LogContext.create(LogContext.java:74)
   at org.netbeans.modules.parsing.impl.indexing.LogContext.create(LogContext.java:67)
   at org.netbeans.modules.parsing.impl.indexing.PathRegistry.scheduleFirer(PathRegistry.java:769)
   at org.netbeans.modules.parsing.impl.indexing.PathRegistry.resetCacheAndFire(PathRegistry.java:764)
   at org.netbeans.modules.parsing.impl.indexing.PathRegistry.access$500(PathRegistry.java:83)