How to change default JRE for all Eclipse workspaces

Question

I have one JRE in C  Program Files  x86  Java jre6 and that was the only one at the time I installed Eclipse   I have subsequently installed a complete JDK in C  home SFTWR jdk1 6 0 21 and changed my JAVA HOME environment variable to that   However  every time I start a new Eclipse workspace  it only picks up the old JRE and I have to manually remove it and add the new one    How do I bind my Eclipse install to the new JDK so that every new workspace points to that only   I checked eclipse ini but there was no reference there to which JRE to go to   UPDATE   I went into Prefs- gt Java- gt Installed JREs  added the new location  marked it as default  removed the other  and it was effective only for the current workspace  However  when I opened a new workspace  only the old JRE was available   So this didn t change the core Eclipse config that is applicable across all  at least new  workspaces

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On windows I ve tried different approaches  - setting JAVA HOME  JRE HOME and extending the PATH to point to the desiered jre18 but nothing helped  - disabling the JRE17 in the java control panel didn t helped either  What helped me out was to force eclipse to use the appropriate JRE in the eclipse ini file e g   -vm C  java jdk1 8 0 111 jre bin javaw exe

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when you select run configuration  there is a JRE tap up next the main tap  select  Workspace default JRE JDK1 7     Be sure to use the jdk in Prefs- gt Java- gt Installed JREs - gt Execution Environment

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I have faced with the same issue  The resolve  - Window-- Preferences-- Java-- Installed JREs-- Add    - Right click on your project-- Build Path-- Configure Build Path-- Add library-- JRE system library-- next-- WorkSpace Default JRE

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My answer will overlap with amphibient s while adding on to it   Your JAVA HOME variable is fine  but you also need to append the following to your Path variable      JAVA HOME  bin   This will allow your applications in your Windows environment to access your JDK  You should also restart your computer once you ve added these environment variables before checking out if they work  In my case  even logging out and then back in didn t work   I had to completely restart   If you want to check if the environment variables are set correctly  you can open up a command prompt and type  echo  JAVA HOME and  echo  Path  to see if those variables are working correctly  While snooping around for solutions  I have also run into people claiming that they need to add quotations marks     around the environment variables to make them work correctly    JAVA HOME   bin  if your JAVA HOME path includes spaces  I thought that this was my case at first  but after doing a full restart my variables seemed to work correctly without quotation marks despite the spaces

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Finally got it   The way Eclipse picks up the JRE is using the system s PATH     I did not have C  home SFTWR jdk1 6 0 21 bin in the path at all before and I did have C  Program Files  x86  Java jre6 bin   I had both JRE HOME and JAVA HOME set to C  home SFTWR jdk1 6 0 21 but neither of those two mattered   I guess Eclipse did  something to the effect of  where java  or which on UNIX Linux  to see where Java is in the path and took the JRE to which that java exe belonged   In my case  despite all the configuration tweaks I had done  including eclipse ini -vm option as suggested above   it remained stuck to what was in the path     I removed the old JRE bin from the path  put the new one in  and it works for all workspaces

User · Answer

I ran into a similar issue where eclipse was not using my current  JAVA HOME  that was on the path and was instead using an older version   The documentation points out that if no -vm is specified in the ini file  eclipse will search for a shared library jvm dll  This appears in the registry under the key HKEY LOCAL MACHINE SOFTWARE Wow6432Node JavaSoft Java Runtime Environment that gets installed when using the windows java installer  key might be a bit different based on 64-bit vs 32-bit  but search for jvm dll    Because it was finding this shared library on my path before the  JAVA HOME  bin  it was using the old version   Like others have stated  the easiest way to deal with this is to specify the specific vm you want to use in the eclipse ini file   I m writing this because I couldn t figure out how it was still using the old version when it wasn t specified anywhere on the path or eclipse ini file     See link to doc below  http   help eclipse org kepler topic org eclipse platform doc isv reference misc launcher html cp 2 1 3 1      Finding a VM and using the JNI Invocation API      The Eclipse launcher is capable of loading the Java VM in the eclipse process using the Java Native Interface Invocation API   The launcher is still capable of starting the Java VM in a separate process the same as previous version of Eclipse did   Which method is used depends on how the VM was found       No -vm specified      When no -vm is specified  the launcher looks for a virtual machine first in a jre directory in the root of eclipse and then on the search path  If java is found in either location  then the launcher looks for a jvm shared library  jvm dll on Windows  libjvm so on  nix platforms  relative to that java executable          If a jvm shared library is found the launcher loads it and uses the JNI invocation API to start the vm    If no jvm shared library is found  the launcher executes the java launcher to start the vm in a new process          -vm specified on the command line or in eclipse ini      Eclipse can be started with  -vm   to indicate a virtual machine to use  There are several possibilities for the value of           directory    is a directory  We look in that directory for              1  a java launcher or      2  the jvm shared library             If we find the jvm shared library  we use JNI invocation  If we find a launcher  we attempt to find a jvm library in known locations relative to the launcher  If we find one  we use JNI invocation  If no jvm library is found  we exec java in a new process          java exe javaw exe   is a path to a java launcher  We exec that java launcher to start the vm in a new process    jvm dll or so   is a path to a jvm shared library  We attempt to load that library and use the JNI Invocation API to start the vm in the current process

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The Installed JREs is used for what JREs to execute for your downstream Java projects and servers   As far as what JVM or JRE that is used to execute Eclipse process  workbench  itself that is controlled by your environment  history and eclipse exe binary   So eclipse exe itself decides what JRE Eclipse will execute itself with  not installed JREs preferences since those are not read until OSGi framework is up and running which is loaded after the JVM JRE is picked   So for new workspaces  Eclipse is going to use its currently executing JRE to populate the JRE prefs   The best way I know how is to force eclipse exe to use the JRE that you tell it via the -vm switch   So in your eclipse ini do this   -startup plugins org eclipse equinox launcher 1 2 0 v20110502 jar --launcher library plugins org eclipse equinox launcher win32 win32 x86 64 1 1 100 v20110502 -vm  path to exactly what jre you want as default javaw exe

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I navigated to   Eclipse gt Pref gt Java gt Installed JRE gt Search      2 of them popped up and I checked the latest one   Before I did this I also went to About gt Check for Updates and updated it  I didn t have to reinstall any JRE or JDK either  I might have done it a while back  except it was with 1 6 not 1 4  Hope that helps

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Open the   Java   Installed JREs preference page  Check the box on the   line for the JRE that you want to assign as the default JRE in your   workbench  If the JRE you want to assign as the default does not   appear in the list  you must add it  Click OK    Source-http   help eclipse org juno index jsp topic  2Forg eclipse jdt doc user 2Ftasks 2Ftask-assign default jre htm

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In eclipse go to   Window-  Java -  Installed JREs  You can remove your current installed jre and add the jdk by specifying the path to where the jdk is installed

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try to change the order   right click on you project-  BuildPath- Configure   - Order and Export tab -  move jre7 UP

[eclipse] How to change default JRE for all Eclipse workspaces?

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