Cannot load 64-bit SWT libraries on 32-bit JVM replacing SWT file

Question

I m trying to debug this problem but not sure where exactly i need to replace SWT jar file for Eclipse    Current System Config   Eclipse Helios 3 6 - 32 Bit JDK 1 6  JVM - 32 Bit  Windows 7 - 64 Bit   Error Message    java lang UnsatisfiedLinkError  Cannot load 64-bit SWT libraries on 32-bit JVM     at org eclipse swt internal Library loadLibrary Library java 194      at org eclipse swt internal Library loadLibrary Library java 174      at org eclipse swt internal C  lt clinit gt  C java 21      at org eclipse swt widgets Display  lt clinit gt  Display java 138      at org eclipse ui internal Workbench createDisplay Workbench java 687      at org eclipse ui PlatformUI createDisplay PlatformUI java 161      at de vogella rcp intro first Application start Application java 18      at org eclipse equinox internal app EclipseAppHandle run EclipseAppHandle java 196      at org eclipse core runtime internal adaptor EclipseAppLauncher runApplication EclipseAppLauncher java 110      at org eclipse core runtime internal adaptor EclipseAppLauncher start EclipseAppLauncher java 79      at org eclipse core runtime adaptor EclipseStarter run EclipseStarter java 369      at org eclipse core runtime adaptor EclipseStarter run EclipseStarter java 179      at sun reflect NativeMethodAccessorImpl invoke0 Native Method      at sun reflect NativeMethodAccessorImpl invoke NativeMethodAccessorImpl java 39      at sun reflect DelegatingMethodAccessorImpl invoke DelegatingMethodAccessorImpl java 25      at java lang reflect Method invoke Method java 597      at org eclipse equinox launcher Main invokeFramework Main java 620      at org eclipse equinox launcher Main basicRun Main java 575      at org eclipse equinox launcher Main run Main java 1408      at org eclipse equinox launcher Main main Main java 1384  An error has occurred  See the log file   Workaround     Link1  Understood the cause of the problem and i tried to replace 64-bit SWT to 32 Bit but i m not sure whether i m doing it right    downloaded 32-bit file swt-3 6 1-win32-win32-x86 zip  Extracted the zip file   Have files as shown below     copied swt jar file   navigated to C  Program Files eclipse plugins  removed 64-bit Swt file   i e org eclipse swt win32 win32 x86 64 source 3 6 2 v3659c    placed copied swt jar file and relaunched   Still throws SAME ERROR   also tried renaming the swt jar file to org eclipse swt win32 win32 x86 64 source 3 6 2 v3659c   Still same ERROR Link2  Suggested the alternative solution but couldn t resolve the problem    Still same ERROR  I really don t want to uninstall 32-JVM and 32-Bit Eclipse and install corresponding 64 Bit versions    Not an OPTION    Workaround After the paulsm4 and Paul Webster response  amp  i m confused   When i tried executing this to check JVM  JRE version in Eclipse  package javaVersion   public class JavaVersion        public static void main  String   args                 System out println   JRE Version      System getProperty   java runtime version               System out println   JVM Bit size      System getProperty   sun arch data model                   Output   1 6 0 31-b05 JVM Bit size  32   However when i tried on command line for JAVA - VERSION    So my understanding system has 64bit JVM where as Eclispe is reading 32 Bit JVM  So how can i divert system to read 32 Bit JVM

User · Answer

I just replaced the swt jar in my package with the 64bit version and it worked straight away  No need to recompile the whole package  just replace the swt jar file and make sure your application manifest includes it

User · Answer

Go to Path C  ProgramData Oracle Java javapath   This path is in my case  might be different in your case    Rename the folder ORACLE with other name line ORACLE OLD   And Restart  the STS IDE    This works for me

User · Answer

Check the target definition if you are working with an RCP-SWT project    Open the target editor of and navigate to the environent definition  There you can set the architecture  The idea is that by starting up your RCP application then only the 32 bit SWT libraries bundles will be loaded  If you have already a runtime configuration it is advisable to create a new one as well

User · Answer

So   just make sure that you are on the right environment i e 32 bit SWT LIBRARIES should match 32 bit JVM   vice versa   I solved this problem by installing  64-bit jdk  64-bit jre and finally by adding setting the jdk path in environment variables adn adding jre to the eclipse

User · Answer

Thanks a lot guys    I overlooked my ECLIPSE VERSION it was 64Bit and 3 6  I had to make sure it s 32Bit Eclipse  32 Bit JVM so i uninstalled Eclipse  amp  all JVM for clean  start  Installed 32Bit JDK1 6 from here and 32Bit Eclipse from here

User · Answer

Well  duh     SWT uses JNI     and JNI is strictly platform specific   Use 32-bit libraries with a 32-bit JVM  64-bit libraries with a 64-bit JVM  make sure the versions match exactly  and don t mix n match   IMHO     PS  You can have multiple JVMs and or multiple Eclipse s co-existing on the same box

User · Answer

Install a JDK   It s possible to get Eclipse to run with a JRE  or at least it used to be  but why bother  Eclipse is much happier with a JDK   Remember that the JRE that is used to run Eclipse does not have to be the JRE that Eclipse uses to run an application   PS  I m assuming here that the original poster s problem was getting Eclipse to start  and not  as some other Answers seem to address  getting Eclipse to start an application

User · Answer

Eclipse is launching your application with whatever JRE you defined in your launch configuration   Since you re running the 32-bit Eclipse  you re running debugging against its 32-bit SWT libraries  and you ll need to run a 32-bit JRE   Your 64-bit JRE is  for whatever reason  your default Installed JRE   To change this  first make sure you have a 32-bit JRE configured in the Installed JREs preference   Go to Window -  Preferences and navigate to Java -  Installed JREs     You can click Add and navigate to your 32-bit JVM s JAVA HOME to add it   Then in your Run Configuration  find your Eclipse Application and make sure the Runtime JRE is set to the 32-bit JRE you just configured      Note the combobox that is poorly highlighted    Don t try replacing SWT jars  that will likely end poorly

User · Answer

I removed C  ProgramData Oracle Java javapath from my path  and it worked for me   But make sure you include x64 JDK and JRE addresses in your path

User · Answer

I also faced the same problem a long time ago   Here is the Solution  In Eclipse Click on  Windows --  Preferences ----  Java ---   Installed JREs ---- Select the JDK  click on  Edit    Check your JDK path  is it according to your path in environmental variables defined in system  if not then change it to  path  defined directory

User · Answer

I removed C  ProgramData Oracle Java javapath from my path  and it worked for me  Perfect Answer  Thanks Nikil

User · Answer

i removed C  ProgramData Oracle Java javapath from my path  and it worked for me   and make sure you include x64 JDK and JRE addresses in your path

User · Answer

Just add -d32 to VM arguments in the  Edit launch configuration properties

[java] Cannot load 64-bit SWT libraries on 32-bit JVM ( replacing SWT file )

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