Maven 2 dependency problem

I'm merging two projects into one(mergin project1 into project2). Now I'm going to copy all dependencies from project1 pom into project2 pom, like :

        <dependency>
            <groupId>commons-configuration</groupId>
            <artif开发者_开发百科actId>commons-configuration</artifactId>
            <version>1.6</version>
        </dependency>

And some others. The build is successful the thing in eclipse annoys me so much like when hovering over import org.apache.commons.configuration.ConfigurationException:

The import org.apache.commons.configuration cannot be resolved

But the build still succeds, what can I do to get rid of these?

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If you use m2eclipse, you need to click Maven -> Update Dependencies.

Otherwise I guess you need to regenerate the Eclipse project with mvn eclipse:eclipse.

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Try doing 'mvn eclipse:clean eclipse:eclipse'. That will force maven to delete all of the old eclipse configurations for your project and rebuild them from scratch.

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Maybe try to edit POM by inserting whitespace and saving it. It should trigger rebuilding of the project. There is also a "Refresh Dependencies" option in m2eclipse plugin. I had similiar problems when I used Eclipse integrated with Maven and the 1st technique usually helped.

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Make sure a build is done successfully and ensure that on your Package Explorer the org.apache.commons jar is found under the Maven Dependencies section (given you have m2eclipse plugin installed in your eclipse)

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What version of Eclipse, mvn and m2eclipse? Might want to double-check those.

You shouldn't need to do mvn eclipse:eclipse anymore - that's obsolete. You can try deleting your Eclipse project files and reopening the project (settings, project, classpath).