Ouch!! ... mvn liferay:build-service hurts ...

I've been trying to generate bunch of services using

    mvn liferay:build-service -P liferay-plugins-development

where liferay-plugins-development profile contains properties setting of my liferay version and deployment directory, and was bumped with the following exception

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 17.172s
[INFO] Finished at: Sat Mar 10 16:50:43 EST 2012
[INFO] Final Memory: 4M/15M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.liferay.maven.plugins:liferay-maven-plugin:6.1.0:build-service (default-cli) on project myliferay-portlet: Execution default-cli of goal com.liferay.maven.plugins:liferay-maven-plugin:6.1.0:build-service failed: An API incompatibility was encountered while executing com.liferay.maven.plugins:liferay-maven-plugin:6.1.0:build-service: java.lang.AbstractMethodError:
 com.liferay.util.sl4fj.LiferayLoggerAdapter.log(Lorg/slf4j/Marker;Ljava/lang/String;ILjava/lang/String;Ljav/lang/Throwable;)V
[ERROR] -----------------------------------------------------
[ERROR] realm =    plugin>com.liferay.maven.plugins:liferay-maven-plugin:6.1.0
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/...../maven_repo/com/liferay/maven/plugins/liferay-maven-plugin/6.1.0/liferay-maven-plugin-6.1.0.jar
[ERROR] urls[1] = file:/...../maven_repo/com/liferay/portal/portal-impl/6.1.0/portal-impl-6.1.0.jar

Suspect this has something to do with different version of SLF4j that is not compatible with the one that maven resolved to when running liferay-maven-plugin, so went ahead and force the SLF4j version that the plugin was using to 1.5.5

 ...
  
    
      
         com.liferay.maven.plugins
         liferay-maven-plugin
         ${liferay.version}
         
            ${liferay.auto.deploy.dir}
            ${liferay.version}
            portlet
         
         
           
              org.slf4j
              slf4j-log4j12
              1.5.5
           
         
       
  ...
  
 ...

It seems to fix this issue, but now I'm bumped with another NullPointerException coming off liferay-maven-plugin source itself. Logged a defect with the Liferay team here (MAVEN-15). Will have to wait and see how this paints out.

Liferay-maven-plugin turns out to be quite a pain in the neck for me ... :-( Guess I should be evaluating Liferay IDE instead to see if it suits me better. It does required that the whole plugins project to be under a Liferay-Plugin-SDK directory though.