Is it possible to install both 32bit and 64bit Java on Windows 7

Question

Is it possible to install both 32bit and 64bit Java on Windows 7   I have some applications that I can run under 64bit  but there are some that only run under 32bit

User · Accepted Answer

Yes  it is absolutely no problem  You could even have multiple versions of both 32bit and 64bit Java installed at the same time on the same machine   In fact  i have such a setup myself

User · Answer

You can install multiple Java runtimes under Windows  including Windows 7  as long as each is in their own directory   For example  if you are running Win 7 64-bit  or Win Server 2008 R2  you may install 32-bit JRE in  C  Program Files  x86  Java jre6  and 64-bit JRE in  C  Program Files Java jre6   and perhaps IBM Java 6 in  C  Program Files  x86  IBM Java60 jre    The Java Control Panel app theoretically has the ability to manage multiple runtimes  Java tab    View    button   There are tabs for User and System settings  You can add additional runtimes with Add or Find  but once you have finished adding runtimes and hit OK  you have to hit Apply in the main Java tab frame  which is not as obvious as it could be - otherwise your changes will be lost   If you have multiple versions installed  only the main version will auto-update  I have not found a solution to this apart from the weak workaround of manually updating whenever I see an auto-update  so I d love to know if anyone has a fix for that   Most Java IDEs allow you to select any Java runtime on your machine to build against  but if not using an IDE  you can easily manage this using environment variables in a cmd window  Your PATH and the JAVA HOME variable determine which runtime is used by tools run from the shell  Set the JAVA HOME to the jre directory you want and put the bin directory into your path  and remove references to other runtimes  - with IBM you may need to add multiple bin directories  This is pretty much all the set up that the default system Java does  You can also set CLASSPATH  ANT HOME  MAVEN HOME  etc  to unique values to match your runtime

User · Answer

As stated by pnt you can have multiple versions of both 32bit and 64bit Java installed at the same time on the same machine   Taking it further from there  Here s how it might be possible to set any runtime parameters for each of those installations   You can run javacpl exe or javacpl cpl of the respective Java-version itself  bin-folder   The specific control panel opens fine  Adding parameters there is possible

User · Answer

To install 32-bit Java on Windows 7  64-bit OS   Machine   You can do   1  Download JDK  http   javadl sun com webapps download AutoDL BundleId 58124 2  Download JRE  http   www java com en download installed jsp jre version 1 6 0 22 amp vendor Sun Microsystems Inc  amp os Linux amp os version 2 6 41 4-1 fc15 i686  3  System variable create  C  program files  x86  java jre6 bin   4  Anywhere you type java -version   it use 32-bit on  64-bit   I have to use this because lots of third party libraries do not work with 64-bit  Java wake up from the hell  give us peach  P  Go-language is killer

[windows-7] Is it possible to install both 32bit and 64bit Java on Windows 7?

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