How to change JAVA HOME for Eclipse ANT

Question

I am trying to sign a jar file using an ANT script  I know this has to be pointed at the JDK directory for jarsigner exe to run  but when I echo java home it returns the JRE directory    This isn t a problem for javac  because I can set the executable path  But  that does not exist for signjar    How do I change the java home path  When I right-click on MyComputer and go to      Properties   Advanced   Environment Variables   The  PATH  variable is correctly pointed to the JDK  C  program files java jdk bin    Update  The file now signs correctly after changing the PATH variable suggested below

User · Answer

In Eclipse the Ant java home variable is not based on the Windows JAVA HOME environment variable   Instead it is set to the home directory of the project s JRE     To change the default JRE  e g  change it to a JDK  you can go to Windows- Preferences    and choose Java- Installed JREs   To change just a single project s JRE you can go to Project- Properties and choose Java Build Path and choose the Libraries tab   Find the JRE System Library and click it  then choose Edit and choose the JRE  or JDK  that you want   If that doesn t work then when running the build file you can choose Run as- Ant Build    and click the JRE tab  choose separate JRE and specify the JRE you want there

User · Answer

Under Windows you need to follow   Start -  Control Panel -  System -  Advanced -  Environment Variables       and you need to set JAVA HOME  which is distinct from the PATH variable you mention  to reference the JDK home directory  not the bin sub-directory  e g   C  program files java jdk

User · Answer

Simply  to enforce JAVA version to Ant in Eclipse   Use RunAs option on Ant file then select External Tool Configuration in JRE tab define your JDK JRE version you want to use

User · Answer

If you are using Eclipse  try the following    Right click on the ant build file  then choose  Properties   Click on the  Run Debug Settings   then click on the launch configuration file  You should be able to edit it then  After you click  Edit   you should see a new window with a  Properties  tab which will show you a list of Ant build properties  There is a  java home  property in the list  Make sure it refers to the correct path

User · Answer

Also be sure to set your JAVA HOME environment variable  In fact  I usually set the JAVA HOME  then prepend the string   JAVA HOME  bin  to the system s PATH environment variable so that if Java ever gets upgraded or changed  only the JAVA HOME variable will need to be changed   And make sure that you close any command prompt windows or open applications that may read your environment variables  as changes to environment variables are normally not noticed until an application is re-launched

User · Answer

Go to Environment variable and add   JAVA HOME C  Program Files  x86  Java jdk1 6 0 37   till jdk path  exclude bin folder  now set JAVA HOME into path as PATH  JAVA HOME  bin  This will set java path to all the applications which are using java   For ANT use    ANT HOME C  Program Files  x86  apache-ant-1 8 2 bin    and include ANT HOME into PATH  so path will look like PATH  JAVA HOME  bin  ANT HOME

User · Answer

In addition to verifying that the executables are in your path  you should also make sure that Ant can find tools jar in your JDK  The easiest way to fix this is to add the tools jar to the Ant classpath

User · Answer

For me  ant apparently refuses to listen to any configuration for eclipse default  project JDK  and the suggestion of  Ant Home Entries  just didn t have traction - there was nothing there referring to JDK   However  this works   Menu  Run  - gt   External Tools  - gt   External Tools Configuration     Goto the node  Ant build   choose the ant buildfile in question       Choose tab  JRE           Select e g   Run in same JRE as workspace   or whatever you want

User · Answer

Set environment variables  This is the part that I always forget  Because you   re installing Ant by hand  you also need to deal with setting environment variables by hand   For Windows XP  To set environment variables on Windows XP  right click on My Computer and select Properties  Then go to the Advanced tab and click the Environment Variables button at the bottom   For Windows 7  To set environment variables on Windows 7  right click on Computer and select Properties  Click on Advanced System Settings and click the Environment Variables button at the bottom   The dialog for both Windows XP and Windows 7 is the same  Make sure you   re only working on system variables and not user variables   The only environment variable that you absolutely need is JAVA HOME  which tells Ant the location of your JRE  If you   ve installed the JDK  this is likely c  Program Files Java jdk1 x x jre on Windows XP and c  Program Files x86  Java jdk1 x x jre on Windows 7  You   ll note that both have spaces in their paths  which causes a problem  You need to use the mangled name 3  instead of the complete name  So for Windows XP  use C  Progra 1 Java jdk1 x x jre and for Windows 7  use C  Progra 2 Java jdk1 6 0 26 jre if it   s installed in the Program Files x86  folder  otherwise use the same as Windows XP    That alone is enough to get Ant to work  but for convenience  it   s a good idea to add the Ant binary path to the PATH variable  This variable is a semicolon-delimited list of directories to search for executables  To be able to run ant in any directory  Windows needs to know both the location for the ant binary and for the java binary  You   ll need to add both of these to the end of the PATH variable  For Windows XP  you   ll likely add something like this    c  java ant bin C  Progra 1 Java jdk1 x x jre bin   For Windows 7  it will look something like this    c  java ant bin C  Progra 2 Java jdk1 x x jre bin   Done  Once you   ve done that and applied the changes  you   ll need to open a new command prompt to see if the variables are set properly  You should be able to simply run ant and see something like this   Buildfile  build xml does not exist  Build failed

User · Answer

Spent a few hours facing this issue this morning  I am likely to be the least technical person on these forums  Like the requester  I endured every reminder to set  JAVA HOME   biting my tongue each time I saw this non luminary advice  Finally I pondered whether my laptop s JRE was versions ahead of my JDK  as JREs are regularly updated automatically  and I installed the latest JDK  The difference was minor  emanating from a matter of weeks of different versions  I started with this error on jdk v 1 0865  The JRE was 1 0866  After installation  I had jdk v1 0874 and the equivalent JRE  At that point  I directed the Eclipse JRE to focus on my JDK and all was well  My println of java home even reflected the correct JRE    So much feedback repeated the wrong responses  I would strongly request that people read the feedback from others to avoid useless redundancy  Take care all  SG

[java] How to change JAVA.HOME for Eclipse/ANT

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