Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved

Question

When I am try to build the project it gives this error.

Errors occurred during the build.
Errors running builder 'Maven Project Builder' on project 'ProjectName'.
Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6
Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6
Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6
Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6

My Java version is 1.8 and Maven version is 3.2.5

And also when I first time configure Maven in my computer and I check that Maven configured correctly with mvn --version command and it works fine. But after restart my computer and checked Maven is work correctly. Then it says:

C:\Users\User Name>mvn --version
'mvn' is not recognized as an internal or external command,
operable program or batch file.

Answer 1

Try update your Eclipse with the newest Maven repository as follows:

1. Open "Install" dialog box by choosing "Help/Install New Software..." in Eclipse
2. Insert following link into "Work with:" input box http://download.eclipse.org/technology/m2e/releases/
   and press Enter
3. Select (check) "Maven Integration for Eclipse" and choose "Next >" button
4. Continue with the installation, confirm the License agreement, let the installation download what is necessary
5. After successful installation you should restart Eclipse
6. Your project should be loaded without Maven-related errors now

Answer 2

Try the following :

1. Make sure you add M2_HOME variable to your environment variables. It looks like you might have set M2_HOME temporarily in a cmd window and not as a permanent environment variable. Also append M2_HOME to the PATH variable.

2. Go to the m2 folder in your user directory.

   Example: On Windows, for user bot, the .m2 directory will be under C:\Users\bot. Look for the settings.xml file in this directory and look for the repository url within this file. See if you are able to hit this url from your browser. If not, you probably need to point to a different maven repository or use a proxy.

3. If you are able to hit the repository url from the browser, then check if the repository contains the maven-resource-plugin version 2.6. This can be found by navigating to org.apache.maven.plugins folder in the browser. It's possible that your pom has hard-coded the dependency of the plugin to 2.6 but it is not available in the repository. This can be fixed by changing the depndency version to the one available in the repository.