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Here are both input/outputs:

Running javac:

Usage: javac <options> <source files>

Running where on javac:

D:\>where javac
INFO: Could not find files for the given pattern(s).
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What happens if you try where javac in D:\userdata\jobranco\Desktop\aspectJ\workspace\aspect_tests\src\swtproj? – gronostaj Apr 18 '13 at 8:49
What's your PATH variable set to? Does where javac.exe return anything? – Karan Apr 18 '13 at 22:10

Apparently (as for Win 7) the implementation of where does not handle quotes (") poperly. It's probably better to remove them from your entire PATH environment variable (don't worry about spaces in this case).

C:\>set PATH=C:\windows\system32;"C:\Java\jdk1.7.0_21\bin\"
C:\>where javac
INFO: Could not find files for the given pattern(s).

after removing quotes:

C:\>set PATH=C:\windows\system32;C:\Java\jdk1.7.0_21\bin\
C:\>where javac

What might be additionally misleading, is that where command could find properly java but failed with javac. It's because you might have JRE installed as well.

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