What is JAVA HOME How does the JVM find the javac path stored in JAVA HOME

Question

I would like to know what is JAVA HOME   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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

use this command  usr libexec java home to check the JAVA HOME

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

The command prompt wouldn t use JAVA HOME to find javac exe  it would use PATH

User · Answer

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

[java] What is JAVA_HOME? How does the JVM find the javac path stored in JAVA_HOME?

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