Could not find artifact com.dm:DmJdbcDriver:jar:1.7.0

This error message usually occurs when Maven is unable to download the required artifact from the specified repository. Here are some possible solutions that you can try:

1. Check if the artifact exists in the repository that you have specified. You can search for it manually or use a tool like Nexus or Artifactory to verify its existence.

2. Make sure that your internet connection is stable and not blocking the download. Sometimes, firewalls or proxies can interfere with the download process.

3. Try changing the repository URL to a different one. If the artifact is available in multiple repositories, you can try using a different one to download it.

4. If you have recently added the dependency to your pom.xml file, try running "mvn clean install" to force Maven to download all the dependencies again.

5. If none of the above solutions work, you can try manually downloading the artifact and installing it to your local repository using the Maven install plugin. Here is an example command:

mvn install:install-file -Dfile=path/to/artifact.jar -DgroupId=com.dm -DartifactId=DmJdbcDriver -Dversion=1.7.0 -Dpackaging=jar

Replace the "path/to/artifact.jar" with the actual path to the downloaded artifact.