Do you have the latest version of the Java Platform, Standard Edition Development Kit installed?
No. Get it here.
If you did download Java you should see a folder like this (assuming the default install and whatever the current version of Java SDK is):

(so the image above is showing you that Java is on my computer (on my C drive in Program Files and in the Java folder))
Now open your command prompt and type this: java -version
Then press the ‘Enter‘ key.
If you don’t see something like this than you didn’t set your Windows Environment path to know about your Java install:

So if you are still reading, this means you need to change set your PATH Environment path.
The short version is do this:
Windows 7 OS
(To make sure that Windows can find the Java compiler and interpreter)
- Select Start -> Computer -> System Properties -> Advanced system settings -> Environment Variables -> System variables -> PATH.
- Prepend C:\Program Files\Java\jdk1.6.0_27\bin;to the beginning of the PATH variable.
- your version of the jdk may be different. If it is, change it to the name you have
- don’t forget that semi-colon(;) at the end (this is the separator character used between all the URLs in the path
- Click OK three times.
[ In Vista, select Start -> My Computer -> Properties -> Advanced -> Environment Variables -> System variables -> PATH. ]
[ In Windows XP, Select Start -> Control Panel -> System -> Advanced -> Environment Variables -> System variables -> PATH. ]
If you need some pics for reference, here you go:
To add or edit anything environment variables in your Windows 7 you need to first go to System properties
Go to “Advanced system settings”
Go under “Advanced” tab > “Environment Variables …”
Go to PATH > double click and add new path into the “variable value” make sure you separate the value with “ ; “
Click ‘OK’ three times.
Now open your command prompt and type this: java -version
Then press the ‘Enter‘ key.
You should now see this:
- if you do, congrats! you have successfully added java to your path
- if you don’t, try following the directions again and see if you made a mistake somewhere along the way
Note: If you are running Windows 7 and you want to change the Environment Variables via the Command Line (CLI), Just open Windows Power Shell and follow the info on this link.


I’d recommend to take a look at Eveditor application as it provides painless way to manage environment variables.
thanx for this useful info..
Glad you found it helpful.