Build path entry is missing: org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7
I already had JDK installed but i still had errors, so I opened command prompt locating it to my project: c:\project\proj>. Then I ran mvn clean && mvn install. That solved my issue !
c:\project\proj>
mvn clean && mvn install