SET JAVA_HOME in windows bat file not working

Question

why is SET JAVA_HOME in this bat file not overriding the environment variable JAVA_HOME?

someFile.bat

@ECHO OFF
SET JAVA_HOME = Progra~2\Java\jdk1.6.0_23
echo JAVA_HOME: %JAVA_HOME%

---

OUTPUT

JAVA_HOME: C:\Program Files (x86)\Java\jdk1.7.0_21

Answer 1

because of the additional space.Try this to see the value you've set:

echo JAVA_HOME: %JAVA_HOME %

A robust way to set the java_home :

SET "JAVA_HOME=Progra~2\Java\jdk1.6.0_23"