I get an Unsupported Protocol Error when deploying a 3rd party jar. What should I do?

If you are using the deploy:deploy-file goal and encounter this error:

"Error deploying artifact: Unsupported Protocol: 'ftp': Cannot find wagon which supports the requested protocol: ftp"

Then you need to place the appropriate wagon provider in your %M2_HOME%/lib. In this case the provider needed is ftp, so we have to place the wagon-ftp jar in the lib directory of your Maven 2 installation.

As an alternative to placing the wagon provider into the Maven distribution, you can also create a dummy POM that declares the required wagon as an <extension> inside the current directory.

If the error description is something like this:

"Error deploying artifact: Unsupported Protocol: 'ftp': Cannot find wagon which supports the requested protocol: ftp org/apache/commons/net/ftp/FTP"

Then you need to place the commons-net jar in %M2_HOME%/lib.

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I don't want to deploy one of the artifacts in my multi-module build. Can I skip deployment?

Yes, you can skip deployment of individual modules by configuring the Deploy Plugin as follows:

             <plugin>
               <artifactId>maven-deploy-plugin</artifactId>
               <version>X.Y</version>
               <configuration>
                 <skip>true</skip>
              </configuration>
            </plugin>
          

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