Why Can\'t Maven Resolve the maven-resources-plugin Dependency?

Could Not Calculate Build Plan: Resolving Plugin Dependencies

The error "Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.5 or one of its dependencies could not be resolved" indicates a problem with resolving dependencies for the maven-resources-plugin.

Troubleshooting Steps:

1. Clear Local Repository: Delete the maven-resources-plugin JAR and POM files from your local Maven repository (~/.m2/repository/org/apache/maven/plugins/maven-resources-plugin/2.5).
2. Update Proxy Configuration: Ensure that your Maven settings.xml includes correct proxy settings if using a proxy to connect to Maven repositories.
3. Configure Eclipse: Check that Eclipse is configured to use the correct Maven installation and not the embedded one. See "Could not calculate build plan :artifact org.apache.maven.plugins:maven-resources-plugin:pom:2.4.3 is not available in the local repository" for guidance.
4. Force Update: If the plugin and its dependencies are not being downloaded, try forcing an update by running "mvn clean install -U" from the command line.
5. Declare Plugin in POM: Add the missing plugin with its required version to the pluginManagement section of your POM file. Maven will automatically download and install the plugin.
6. Install Plugin Manually: Download the missing plugin JAR and POM files from Maven Central and install them directly into your local repository.
7. Resolve Missing Plugin Dependencies: If other plugin dependencies are also missing, download and install them using the manual installation process.

Additional Notes:

• If none of these steps resolve the issue, consider using "less strict" cache settings in Eclipse.
• Double-check if the artifact org.apache.maven.plugins:maven-resources-plugin:2.5 is available in the configured repositories.
• If you encounter any other missing plugin dependencies, follow the same troubleshooting steps to resolve them.

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