You need to run build with JDK or have tools.jar on the classpath

You need to run build with JDK or have tools.jar on the classpath.
If this occures during eclipse build make sure you run eclipse under  JDK as well
(com.mysema.maven:apt-maven-plugin:1.0.6:process:default:generate-sources)

//
Try setting this to your eclipse.ini file and restarting eclipse to make sure that it's also using your JDK:
-vm
C:\jdk1.7\bin\javaw.exe

Cautions:

this must go just above -vmargs
you're full path to your VM maybe different than the one above
See this as reference.