Try downloading the file manually from the project website. Then, install it using the command:

mvn install:install-file -DgroupId=opensymphony -DartifactId=oscore -Dversion=2.2.7 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:

• mvn deploy:deploy-file -DgroupId=opensymphony -DartifactId=oscore -Dversion=2.2.7 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]