Maven: Overview for the values of Maven properties

Question

I would like to find out the values of all Maven properties as they apply to some Maven project.
mvn help:system lists OS environment variables and

Answer 1

Actually project.build.outputDirectory is there but you need to execute in 'compile' phase, and NOT in 'validate'. I guess what properties are available also depends on the current phase for the executing goal of a particular plug-in, in this case 'maven-antrun-plugin'.

            
        
            org.apache.maven.plugins
            maven-antrun-plugin
            ${ant.plugin.version}
            
                
                    compile
                    
                        run