Update: Even though this is the accepted answer, please check the answer of Emmanuel Bourg below – his answer is probably what you would like to do, especially if you’re having a snapshot version.
You can use the maven deploy plugin for that. It has a goal for deploying a single file to any repository.
For the jar itself:
mvn deploy:deploy-file \
-DgroupId=com.yourname.jgoodies \
-DartifactId=jgoodies-forms \
-Dversion=1.50 \
-Dfile=/path/to/jgoodies-1.50.jar \
-Dpackaging=jar \
-Durl=file://path/to/your/local/repository
For the sources:
mvn deploy:deploy-file \
-DgroupId=com.yourname.jgoodies \
-DartifactId=jgoodies-forms \
-Dversion=1.50 \
-Dfile=/path/to/jgoodies-sources.jar \
-Dpackaging=jar \
-Durl=file://path/to/your/local/repository \
-Dclassifier=sources
For the javadoc:
mvn deploy:deploy-file \
-DgroupId=com.yourname.jgoodies \
-DartifactId=jgoodies-forms \
-Dversion=1.50 \
-Dfile=/path/to/jgoodies-javadoc.jar \
-Dpackaging=jar \
-Durl=file://path/to/your/local/repository \
-Dclassifier=javadoc
Note that this will generate a standard POM, so you won’t have the dependencies of JGoodies (if any) pulled automatically but have to specify them manually in your project.