[xwiki-users] Build Xwiki platform from source , How ?

Hi I tried to build Xwiki platform from source but I could not get success, I followed tutorial on this page http://dev.xwiki.org/xwiki/bin/view/Community/Building but I could not get away from the this Error [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:testCompile (default-testCompile) on project xwiki-platform-configuration-default: Compilation failure: Compilation failure: [ERROR] bootstrap class path not set in conjunction with -source 1.6 ..... Thanks