Cannot load 64-bit SWT libraries on 32-bit JVM ( r

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.<clinit>(C.java:21)
    at org.eclipse.swt.widgets.Display.<clinit>(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:

1. 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

2. Link2: Suggested the alternative solution but couldn't resolve the problem.

   Still same ERROR

3. 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 & 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 ?

Answer 1

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.

Answer 2

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.

Answer 3

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.

Answer 4

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.

Answer 5

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.

Answer 6

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