How to troubleshoot a problem where the Java environment variable settings do not work

Learn about the installation of the Java Development environment (http://www.maiziedu.com/group/article/11995/) in reading, which involves Java environment variable settings, but the previous time I installed the JDK under the win7 system , always pops up "Javac is not an internal command or external command, Also not a program or batch file to run " prompt box. Toss for a long time, and finally find a solution, now the small part of this method to share to everyone, hope to be useful to you, specific collation as follows:

First step: InstallJdk-6u26-windows-x32.exe, the path is the default path, and the next step is until the installation is complete.
Step Two: Set environment variables:
1, Enter the environment variable setting method, which is only forWindows7:"Computer"Right-click"Properties"--"Advanced system Settings"--"Advanced"--"Environment Variables"Open the Environment Variables Settings window.
2, in the following"System Environment Variables"Settings window, click"New", establishJava_homevariables:    
Variable name:Java_home
Variable Value:C:\Program files\java\jdk1.6.0_26
3, in the following"System Environment Variables"Settings window, click"New", establishCLASSPATHvariables:    
Variable name:CLASSPATH
Variable Value:C:\Program Files\java\jdk1.6.0_26\lib\dt.jar; C:\Program Files\java\jdk1.6.0_26\lib\tools.jar; (note semicolon)
4, in the following"System Environment Variables"Settings window, double-click"PATH"variable, added after the value of the variable:   ; C:\Program Files\java\jdk1.6.0_26\bin; (Note Semicolon)
after setting the environment variable,cmdInput inJavaccommand not available, prompt"Javacis not an internal command or external command, or a program or batch file that can be run"but the inputjava-versioncan display normallyJDKversion number, descriptionJavacommand is available.

input Set View environment variables and discover Java_home The configuration is OK, but the call to %java_home% , the variable is not replaced by the actual path, and the reason is unknown.

Solution:
Run -->cmd
Run the following command in the console to set the Java environment variable to resolve:
Set Path=xxx;%java_home%\bin;

XXX for the system in the original value of path, note to write back.

PostScript: One possible cause of this problem is thatcmd is always on, modifying environment variables without closing and then opening CMD, resulting in no effect. Because the configuration toss a long time, no longer inspection .

If you have encountered this situation when installing the JDK, you can use this method I proposed to try, in the Java configuration environment to be particularly careful with those characters, not because the input format is not correct, waste a lot of time, and it is difficult to find.

How to troubleshoot a problem where the Java environment variable settings do not work