NetBeans background scanning projects takes too long

Question

NetBeans background scanning projects takes too long. Every time when I open netbeans it scanning for ages. I used NetBeans 7.2 and it works perfecly. Now I formatted pc and reinstalled windows, install the same version of NetBeans 7.2, and it works to slow.

Answer 1

Having the same issue with 8.0.2 when a project has JS resources I tracked it down in my case to a problem with the javascript2 editor module which has been updated over the original version shipping with netbeans 8.0.2.

I simply solved it by removing the updated module.

On Linux:

rm ~/.netbeans/8.0.2/modules/org-netbeans-modules-javascript2-editor.jar

However, after letting the netbeans updater download the module a second time, the problem didn't appear again.

In Netbeans 8.1, the location of this file is at: ide/modules/org-netbeans-modules-javascript2-editor.jar.

Answer 2

I have the same problem in netbeans but i found solution by unselect the check from auto scan background in your netbeans IDE go to tools and then Option and select then to miscellaneous and select file tab inside miscellaneous and you will find check as "enable of auto-scanning of the source unselect that one and netbeans will be fast then i hope it will help you in fasting your IDE too

Answer 3

After latest update of Netbean 8.0.2 I have the same problem that scaning process did not stop and go forever with CPU usage on 25%.

When I replace javascrip editor files in C:\Program Files\NetBeans 8.0.2\ide\modules on Windows 7 with old one then scaning project process start work again. You can take those file from this repo.

Answer 4

i'm facing the same issue, but it works fine after increase the heap size by adding -J-Xmx2048m in <NETBEANS_DIR>\etc\netbeans.conf

mine looks like this:

 netbeans_default_options="-J-client -J-Xss2m -J-Xms2048m -J-Xmx2048m -J-XX:PermSize=32m ......

Answer 5

Try the following :
1) Go to Window-->Files. This opens the Files Tab.
2) In the Files Tab for each opened project open the nbproject folder and inside it open the project.properties file.
3) Now in this file below the property "excludes" there are file references listed for all your referred Libraries (JARs)
4) There might be some repeated file references with paths that may be old or on someone else's machine(if you are working in a group and transferred projects from someone's machine)
5) Delete those old path references.
Example -
excludes=
file.reference.xyz.jar=../not/correct/path.jar //delete this line
file.reference.xyz.jar-1=../correct/path.jar //remove -1
....
includes=**

6)Also locate the property "javac.classpath" and delete the unnecessary classpath entries corresponding to the deleted references as described above.
Example -
javac.classpath=\
${file.reference.xyz.jar}:\ //keep this line
${file.reference.xyz.jar-1}:\ //delete this line
....
javac.compilerargs=

7) So now the file reference mentioned in the file reference section and the javac.classpath property is same and points to a valid Library (JAR) address on your machine or network.
Example -
excludes=
file.reference.xyz.jar=../correct/path.jar //the correct reference & path
....
includes=**
....
javac.classpath=\
${file.reference.xyz.jar}:\ //the correct classpath entry for reference
....
javac.compilerargs=
....

The reason the above procedure worked (in my case) is because it prevents Netbeans from scanning unnecessary Library paths that may not be present on your machine/network.

Answer 6

On Windows 10 64bit I had the same problem with Netbeans IDE 8.1 I restarted Netbeans as administrator and the problem was solved. Then I closed Netbeans and started normally and the problem was still gone.

Product Version: NetBeans IDE 8.1 (Build 201510222201)
Updates: NetBeans IDE is updated to version NetBeans 8.1 Patch 1
Java: 1.8.0_60; Java HotSpot(TM) 64-Bit Server VM 25.60-b23
Runtime: Java(TM) SE Runtime Environment 1.8.0_60-b27
System: Windows 10 version 10.0 running on amd64; Cp1252; nl_NL (nb)

Answer 7

OS: Windows 7 x64.

The following worked for me:

I fully uninstalled Netbeans (ticked all boxes in uninstaller). For those who couldn't you'll need to go to C:\Users\%username%\AppData\Roaming\NetBeans\8.0.2 and delete a file called 'lock'. This is normally removed when the program exits but if you need to force terminate it'll remain there.

After that I uninstalled JDK and JRE then downloaded Java Platform (JDK) 8u40: http://www.oracle.com/technetwork/java/javase/downloads/index.html

And Netbeans 8.0.2: https://netbeans.org/downloads/

Installed JDK (which installs JRE too), after that Netbeans. Once complete I loaded up projects where background scanning got stuck and it seems to have fixed it. Will post updates if it starts happening again.

Answer 8

I actually made a bug report for this issue. It was fixed and pushed to the update channels yesterday. So for anyone still having this specific bug, let Netbeans check for updates. :)

Bugfix: https://netbeans.org/bugzilla/show_bug.cgi?id=250985

Answer 9

On Ubuntu 18.04 / Netbeans 10.0, I had the same problem.

• [FAIL] Deleted cache
• [FAIL] Deleted project-specific "nbproject" dir
• [FAIL] Closed the offending project (mouseover the progress bar to identify which one) --> restart NB --> create new project
• [SUCCESS] Nuked the project from the F/S --> re-cloned --> restarted NB. I also renamed the directory itself, in case there was some other cache that pointed to the old dirname.

Answer 10

Please try NetBeans 8.0.2 from https://netbeans.org/downloads/

NetBeans 7.2 is too old and you will not get any support anymore.

Answer 11

I was having the same problem with Netbeans 8.1, Windows 10. It was also hanging when I tried to compile and refactor. It would sometimes say 100% done yet continue background scanning for hours. I closed the project in which this was happening, and switched to a simple project and the problem went away. So I examined my code. I had class A extending class B, then class B importing class A. When I changed this, the endless looping in Ant stopped.

Answer 12

Always I fix such Netbeans related problems by deleting cache directory.

Directory location can be seen on About dialog window. For me, the path is

C:\Users\USER\AppData\Local\NetBeans\Cache\YOUR_VERSION

Answer 13

This problem is related to one of the project opened in your IDE. As I had been facing the same issue but, after spending two hours on that issue I finally fixed that. Close project one by one or check and close the project where background processing is taking time. After closing the project delete the .nbproject folder and re-import the same project into your IDE.

Answer 14

It should be called foreground scanning of projects. Closing the program and restarting solves it for me sometimes.

Answer 15

I had the same problem but in my case I was on Windows 10 and running NetBeans 8.1.

Before I formatted my laptop I copied and backed up C:\Users\user_name\AppData\Roaming\NetBeans\8.1 and C:\Users\user_name\AppData\Local\NetBeans\Cache folders

Then i followed the below steps:

1. Install NetBeans and run it.
2. Closed NetBeans
3. Go to C:\Users\user_name\AppData\Roaming\NetBeans\8.1 and C:\Users\user_name\AppData\Local\NetBeans\Cache folders and replace them with the backed up folders.
4. Run NetBeans again

I hope this solves your problem!!

Answer 16

In my Laravel case ,got this "forever scanning" because the project was created in another IDE. I put the old IDE related folders .idea , vendor , node_modules into myproject->Properties->Ignored folders . Relaunched NetBeans as admin. It will scan a little bit but next time wont stick on that.