tools.jar can not be found in JRE folder

I came across this error other day i was trying to configure ant in my new machine. The reason for this is that the relevant jar file is not in the <JRE location>lib folder but in <JDK location>lib folder.

The most simplest fix for this is to just copy the "tools.jar" file from the <JDK location>lib to  
<JRE location>lib folder.
 
Good luck.
:)