i've added version number, hovewer it's unclear for me why sometimes I need to put this numbe, and sometimes I don't. Also XML validator says version numbe isn't proper in this place, but maybe it's validator's error. After fixing it: [INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [ERROR] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Project 'pl.xxx.esp:war' is duplicated in the reactor It seems I need to give diferent ArtifactId for WAR, JAR etc? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4094092#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...