The goals for the Rules Compiler Plugin are bound to their respective phases in the build lifecycle. So to compile your rules sources, you only need to tell maven which lifecycle to execute. The following will compile your rules sources:
mvn compile
To compile your test rules sources, you'll do:
mvn test-compile
The above command will execute both rules-compiler:compile and rules-compiler:test-compile since the compile phase happens a few phases before the test-compile phase.
Since the Rules Compiler Plugin executes automatically during their phases, you don't have to put executions unlike the other plugins.
<project> ... <build> <plugins> <plugin> <groupId>net.sourceforge.rules</groupId> <artifactId>rules-compiler-plugin</artifactId> <configuration> <!-- put your configurations here --> </configuration> </plugin> </plugins> </build> ... </project>