I would like to know what JAVA_HOME is. Where do I set the path of javac.exe and java.exe. It is in environment variables? When I compile a Java program from command prompt, how does the JVM find javac.exe
?
JVM does not find java.exe
. It doesn't even call it. java.exe
is called by the operating system (Windows in this case).
JAVA_HOME
is just a convention, usually used by Tomcat, other Java EE app servers and build tools such as Gradle
to find where Java lives.
The important thing from your point of view is that the Java /bin
directory be on your PATH
so Windows can find the .exe
tools that ship with the JDK: javac.exe
, java.exe
, jar.exe
, etc.
java
will actually respect that and forward the command to whatever JRE is defined there. So it is not only 3rd parties who respect JAVA_HOME, java
itself does. Check this explanation: clojureverse.org/t/… –
Chesterfieldian 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
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
The command prompt wouldn't use JAVA_HOME to find javac.exe, it would use PATH.
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 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!!
JAVA_HOME
is an environment variable which is read by some development tools like Apache Tomcat, Apache Maven, Gradle, Jenkins etc. Usually, JAVA_HOME
is set to point to JDK instead of JRE because these development tools need to use tools like compiler, debugger, document generator etc. which are only available in JDK since JDK is a development kit. JRE is only meant for running java applications. JDK = JRE + Development tools
Consumer facing Java applications don't read JAVA_HOME
variable and they just need to know where the JVM is located and that's why JVM location (directory) needs to be added to the PATH
variable. This is automatically done for you when you install Java software. Whenever you try to run a Java application by either double clicking on the app or through command line, your operating system reads PATH
variable to locate and run JVM and it doesn't look for JAVA_HOME
variable.
use this command /usr/libexec/java_home to check the JAVA_HOME
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
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..
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