exec:javaターゲットでJavaアプリケーションを実行できます。
なかなか思い出せず、ようやく実行できました。
$ mvn exec:java -Dexec.mainClass="local.sa.Sizeof" -Dexec.args=""
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'exec'.
[INFO] ------------------------------------------------------------------------
[INFO] Building sizeof
[INFO] task-segment: [exec:java]
[INFO] ------------------------------------------------------------------------
[INFO] Preparing exec:java
[INFO] No goals needed for project - skipping
[INFO] [exec:java {execution: default-cli}]
'before' heap: 9315800, 'after' heap: 11715800
heap delta: 2400000, {class java.lang.Object} size = 24 bytes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Wed Jan 27 22:49:24 JST 2010
[INFO] Final Memory: 8M/79M
[INFO] ------------------------------------------------------------------------
$