Unbound classpath variable

If you already did several times STEP 1, go to STEP 2

STEP 1
Try deleting and redefining env vars:

• Open the Eclipse Preferences [Window - Preferences]
• Go to [Java - Build Path - Classpath Variables]
• Click New and set its name as M2_REPO
• Click Folder and select your Maven repository folder. For example, my repository folder is C:/Users/user/.m2/repository
• Rebuild the Project.

Beside from inside of Eclipse, you can also add the M2_REPO variable from command line using this Maven command:

mvn -Declipse.workspace=<path-to-eclipse-workspace> eclipse:add-maven-repo

STEP 2
If your build path is correctly defined, check Maven settings.xml:

Window --> Preferences --> Maven ---> User Settings

If not, set it there and change localRepository path in settings tag inside settings.xml. Normally you will find settings.xml in .m2 folder under the user folder (for eg. C:\Documents and Settings\userName.m2).

Well, I tried the steps in @Jordi's answer. But those didn't make any difference. And I tried some ritualistic things in eclipse such as:

• closing the project and opening it
• restarting the IDE
• cleaning and rebuilding etc...

with no success.

Then strange thing happened when I changed the Java complience level to 1.8 and revert it back to 1.6. It worked! All unbound classpath variable errors are gone now.

Update Project worked for me :

Step 1 : Select Project Folder

Select the project folder that is giving the error.

Step 2 : Update Maven Project

Alt + F5 shortcut OR right-click >> Maven >> Update Project.

Step 3 : Finalize

Click OK and let it update.

The errors should disappear after that.

Good Luck