"javac" is not found and cannot be manually located in the C:\Program File (86x)\Java\jre7\bin

"javac" is not found and cannot be manually located in the C:\Program File
(86x)\Java\jre7\bin

I know this is a classical question, but please help me to resolve this
problem. After installing jre7 Update 25 on Windows 7, setting the
JAVA_HOME, CLASSPATH and adding them to PATH, "java" and "javacpl" work
fine, but "javac" is not found and cannot be manually located in the
C:\Program File (86x)\Java\jre7\bin. What can you suggest? Thank you.