How to set java home on Windows 7

Question

I went to the Environment Variables in  System  in the control panel and made two new variables  one for user variables and one for system variables  Both were named JAVA HOME and both pointing to     C  Sun SDK jdk bin   But for some reason  I still get the below error when running a Java command     BUILD FAILED C  Users Derek Desktop eclipse eclipse glassfish setup xml 161  The following error  occurred while executing this line  C  Users Derek Desktop eclipse eclipse glassfish setup xml 141  The following error occurred while executing this line  C  Users Derek Desktop eclipse eclipse glassfish setup xml 137  Please set java home to a JDK installation  Total time  1 second C  Users Derek Desktop eclipse eclipse glassfish gt lib ant bin ant -f setup xml Unable to locate tools jar  Expected to find it in C  Program Files Java jre6 lib tools jar Buildfile  setup xml   How can I fix this problem

User · Answer

In cmd  temporarily for that cmd window    set JAVA HOME  C        java jdk1 x y zz   echo  JAVA HOME   set PATH  PATH   JAVA HOME  bin  echo  PATH

User · Answer

What worked for me was adding the  JAVA HOME  bin to the Path environment variable with the JAVA HOME environment variable pointing to the jdk folder

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For those who are still stumped with this problem  I tried all the above suggestions  --  If you re on a 64-bit version of Windows and you ve installed the 32-bit JDK  besides adjusting PATH variables  you may need to adjust registry variables  too   I was pulling my hair out  having correctly set my PATH variables -- still to no avail -- and then only finding  vacated  Java entries in my registry  seemingly a deadend of fixing the  misfiring  Java Runtime Environment    By using Process Monitor to watch the program I was trying to get started  in order to sniff out where it was looking in the registry for Java  Runtime Environment   I triumphantly discovered that it s looking in the 32-bit version of registry entries  found in HKEY LOCAL MACHINE SOFTWARE   Wow6432Node   JavaSoft Java Runtime Environment    Within that key  you should find subkeys of different Java versions installed  past and or present   Click on the subkey of the latest version  my subkey is currently 1 7 0 25  for example   After clicking on that subkey  you ll see registry string values listed on the right  and particularly  JavaHome and RuntimeLib  You need to modify the values of those two values to reflect the both the current folder and jvm dll file  respectively   For example  in my case  the values were  previously  respectively set at C  Program Files  x86  Java jre7 and C  Program Files  x86  Java jre7 bin client jvm dll which are nonexistent on my machine  I had to update these to the current folder and file of C  Program Files  x86  Java jdk1 7 0 25 jre and C  Program Files  x86  Java jdk1 7 0 25 jre bin client jvm dll   Again  this will depend entirely on both what version of Java  JDK and or JRE  you have installed -- 32 or 64-bit -- and what type of operating system you re on -- 32 or 64-bit  Just know that they re reflected in different locations within the registry  like the Wow6432Node for 32 bit applications  in my case with the 32-bit JDK installed on a 64-bit machine    Now that I ve updated those two registry values  my program runs flawlessly  with no more hiccups or complaints about a missing Java Runtime Environment  stemming from the registry

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Find JDK Installation Directory  First you need to know the installation path for the Java Development Kit   Open the default installation path for the JDK   C  Program Files Java   There should be a subdirectory like   C  Program Files Java jdk1 8 0 172      Note  one has only to put the path to the jdk without  bin in the end  as suggested on a lot of places   e g  C  Java jdk1 8 0 172 and NOT C  Java jdk1 8 0 172 bin       Set the JAVA HOME Variable  Once you have the JDK installation path    Right-click the My Computer icon on your desktop and select Properties  Click the Advanced tab  then click the Environment Variables button  Under System Variables  click New   Enter the variable name as JAVA HOME  Enter the variable value as the installation path for the Java Development Kit   Click OK   Click Apply Changes       Note  You might need to restart Windows   The complete article is here  on my blog  Setting JAVA HOME Variable in Windows

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goto Mycomputer This PC  -  rightclick - select properties -  Advanced system settings -  environment variables-  in system variables click  New  button and write JAVA HOME in variable name and path C  Program Files Java jdk1 8 0 131 were jdk is present in variable value-  click ok    close and reopen the command prompt after setting JAVA HOME  Sometimes changes does not reflect in the cmd opened before setting the JAVA HOME   you can also set JAVA HOME through terminal itself  SET JAVA HOME  C  Program Files  x86  Java jdk1 8 0 131

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Run Eclipse as Administrator   That solved my problem  I m still digging for the logic behind it

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You may wanna look into Windows System32 folder for the following files  - java exe - javaw exe - javaws exe  Because  the path variable is including these files  you can get a headache trying to figure out why the java -version or javac -version keeps pointing to the old JAVA HOME  rename those files  take out the extension with an underscore  for instance  And then  you only will have to create the JAVA HOME variable  add it to the path variable  e g    JAVA HOME   and append the   bin  particle  This way you need to only change the JAVA HOME variable pointing to different JRE or JDK and have multiple installations of java just by setting JAVA HOME   This also means that it is better to install Java manually  without an installer  so you are able to toy with it

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We need to make a distinction between the two environment variables that are discussed here interchangeably  One is the JAVA HOME variable  The other is the Path variable  Any process that references the JAVA HOME variable is looking for the search path to the JDK  not the JRE  The use of JAVA HOME variable is not meant for the Java compiler itself  The compiler is aware of its own location  The variable is meant for other software to more easily locate the compiler  This variable is typically used by IDE software in order to compile and build applications from Java source code  By contrast  the Windows CMD interpreter  and many other first and third party software references the Path variable  not the JAVA HOME variable   Use case 1  Compiling from CMD  So for instance  if you are not using any IDE software  and you just want to be able to compile from the CMD  independent of your current working directory  then what you want is to set the Path variable correctly  In your case  you don t even need the JAVA HOME variable  Because CMD is using Path  not JAVA HOME to locate the Java compiler   Use case 2  Compiling from IDE  However  if you are using some IDE software  then you have to look at the documentation first of all  It may require JAVA HOME to be set  but it may also use another variable name for the same purpose  The de-facto standard over the years has been JAVA HOME  but this may not always be the case   Use case 3  Compiling from IDE and CMD  If in addition to the IDE software you also want to be able to compile from the CMD  independent of your current working directory  then in addition to the JAVA HOME variable you may also need to append the JDK search path to the Path variable   JAVA HOME vs  Path  If your problem relates to compiling Java  then you want to check the JAVA HOME variable  and Path  where applicable   If your problem relates to running Java applications  then you want to check your Path variable   Path variable is used universally across all operating systems  Because it is defined by the system  and because it s the default variable that s used for locating the JRE  there is almost never any problem running Java applications  Especially not on Windows where the software installers usually set everything up for you  But if you are installing manually  the safest thing to do is perhaps to skip the JAVA HOME variable altogether and just use the Path variable for everything  for both JDK and the JRE  Any recent version of an IDE software should be able to pick that up and use it   Symlinks  Symbolic links may provide yet another way to reference the JDK search path by piggybacking one of the existing environment variables   I am not sure about previous versions of Oracle Sun JDK JRE releases  but at least the installer for jdk1 8 0 74 appends the search path C  ProgramData Oracle Java javapath to the Path variable  and it puts it at the beginning of the string value  This directory contains symbolic links to the java exe  javaw exe and javaws exe in the JRE directory   So at least with the Java 8 JDK  and presumably the Java 8 JRE standalone  no environment variable configuration needs to be done for the JRE  As long as you use the installer package to set it up  There may be differences on your Windows installation however  Note that the Oracle JRE comes bundled with the JDK   If you ever find that your Java JDK configuration is using the wrong version of the compiler  or it appears to be working by magic  without being explicitly defined so  without casting the spell   then you may have a symlink somewhere in your environment variables  So you may want to check for symlink

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This is the official solution for setting the Java environment from www java com - here   There are solutions for Windows nbsp 7  Windows nbsp Vista  Windows nbsp XP  Linux Solaris and other shells     Example     Windows 7         Select Computer from the Start menu   Choose System Properties from the context menu   Click Advanced system settings -  Advanced tab   Click on Environment Variables  under System Variables  find PATH  and click on it    In the Edit windows  modify PATH by adding the location of the class to the value for PATH  If you do not have the item PATH  you may select to add a new variable and add PATH as the name and the location of the class as the value    Reopen Command prompt window  and run your Java code

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You need to set it to C  Sun SDK jdk  Assuming that is where the JDK is installed - It is not the default  - Do not put the  bin in C  Sun SDK jdk bin   If your app only runs when you are logged in as the current user then put it in the user variables - If it needs to run for all users on your system then put it in System variables   You might also need to add  JAVA HOME  bin to the path also  Also it depends on whether you run it from just the user or from all users  including System

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if you have not restarted your computer after installing jdk just restart your computer   if you want to make a portable java and set path before using java  just make a batch file i explained below   if you want to run this batch file when your computer start just put your batch file shortcut in startup folder  In windows 7 startup folder is  C  Users user AppData Roaming Microsoft Windows Start Menu Programs Startup   make a batch file like this   set Java Home C  Program Files Java jdk1 8 0 11 set PATH  PATH  C  Program Files Java jdk1 8 0 11 bin   note  java home and path are variables  you can make any variable as you wish  for example set amir good boy and you can see amir by  amir  or you can see java home by  java home

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One Image can fix this issue    For More

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After hours of work around most of the solutions here  the problem was solved for me just by installing 32-bit JDK

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http   javahowto blogspot com 2006 05 javahome-vs-javahome html  Control Panel   Java  Java tab  click the View button  In Runtime Parameters  put   -Djava home YOUR PATH HERE   Or when you execute Java you can add that command line switch to the command   java -Djava home PATH SomeJavaApp

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In Eclipse  Window- gt Preferences- gt Java- gt Installed JREs  Use the search feature to make sure your latest Java installation is listed  then make sure it is the one that is checked  This should be a JDK not a JRE

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You have to first Install JDK in your system    Set Java Home  JAVA HOME   C  Program Files Java jdk1 7 0  Location of your JDK Installation Directory   Once you have the JDK installation path     Right-click the My Computer icon on Select Properties  Click the Advanced system setting tab on left side of your screen Aadvance Popup is open  Click on Environment Variables button        Under System Variables  click New  Enter the variable name as JAVA HOME  Enter the variable value as the installation path for the Java Development Kit  Click OK  Click Apply Changes    Set JAVA Path under system variable  PATH  C  Program Files Java jdk1 7 0   Append Value with semi-colon

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Windows 7   Go to Control Panel All Control Panel Items User Accounts using Explorer  not Internet Explorer    or    click on the Start button   click on your picture    Change my environment variables   New        if you don t have enough permissions to add it in the System variables section  add it to the User variables section  Add JAVA HOME as Variable name and the JDK location as Variable value   OK     Test    open a new console  cmd  type set JAVA HOME   expected output  JAVA HOME C  Program Files Java jdk1 8 0 60

User · Answer

While adding your Java directory to your PATH variable  you might want to put it right at the beginning of it  I ve had the problem  that putting the Java directory at the end of the PATH would not work  After checking  I ve found java exe in my Windows System32 directory and it looks like the first one wins  when there are several files with the same name in your PATH

[java] How to set java_home on Windows 7?

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