The command prompt wouldn't use JAVA_HOME to find javac.exe, it would use PATH.
JAVA_HOME
and JRE_HOME
are not used by Java itself. Some third-party programs (for example Apache Tomcat) expect one of these environment variables to be set to the installation directory of the JDK
or JRE
. If you are not using software that requires them, you do not need to set JAVA_HOME
and JRE_HOME
.
PATH
is an environment variable used by the operating system (Windows, Mac OS X, Linux) where it will look for native executable programs to run. You should add the bin
subdirectory of your JDK
installation directory to the PATH
, so that you can use the javac
and java
commands and other JDK
tools in a command prompt window. Courtesy: coderanch
JAVA HOME
is used for setting up the environment variable for JAVA. It means that you are providing a path for compiling a JAVA program and also running the same. So, if you do not set the JAVA HOME( PATH ) and try to run a java or any dependent program in the command prompt.
You will deal with an error as
javac : not recognized as internal or external command
.
Now to set this, Just open your Java jdk then open bin folder then copy the PATH of that bin folder.
Now, go to My computer right click on it----> select properties-----> select Advanced system settings----->Click on Environment Variables------>select New----->give a name in the text box Variable Name and then paste the path in Value.
That's All!!
set environment variable
JAVA_HOME=C:\Program Files\Java\jdk1.6.0_24
classpath=C:\Program Files\Java\jdk1.6.0_24\lib\tools.jar
path=C:\Program Files\Java\jdk1.6.0_24\bin
Basically JAVA_HOME
is use to set path of the java . it is use in windows. it's used for set path of the multiple software like as java EE
, ANT
and Maven
.
this is the steps to solve your problem:
only for core java to set path :
path :"C:\Program Files\Java\jre1.8.0_77\bin"
but when you are use multi built like as ANT
, core java then you are used JAVE_HOME
in environment .
follow the steps :
JAVA_HOME
:"C:\Program Files\Java\jre1.8.0_77\bin"
ANT_HOME
:"C:\ant\apache-ant-1.9.6"
Path: JAVA_HOME
, ANT_HOME
;
it is the systematic way to set the environment variable..
use this command /usr/libexec/java_home to check the JAVA_HOME
JAVA_HOME is a environment variable (in Unix terminologies), or a PATH variable (in Windows terminology). A lot of well behaving Java applications (which need the JDK/JRE) to run, looks up the JAVA_HOME variable for the location where the Java compiler/interpreter may be found.
JAVA_HOME is an Environment Variable set to the location of the Java directory on your computer. PATH is an internal DOS command that finds the /bin directory of the version of Java that you are using. Usually they are the same, except that the PATH entry ends with /bin
Source: Stackoverflow.com