Can't load IA 32-bit .dll on a AMD 64-bit platform

Question

I am trying to use SVMLight from Java, using the JNI wrapper on this page:

  static {
    System.loadLibrary("lib/JNI_SVM-light-6.01/lib/svmlight");
  }

I get the following error:

... lib\JNI_SVM-light-6.01\lib\svmlight.dll: Can't load IA 32-bit .dll on a AMD 64-bit platform

Can I solve this by recompiling the .dll for 64 bit? How would I go about doing this? Is there some other workaround I can use? SVMLight makes the C source code available.

Solution 1

Yes, you'll have to recompile the DLL for 64-bit. Your only other option is to switch to a 32-bit JVM, or otherwise get some 32-bit process to load the DLL on your behalf and communicate with that process somehow.

Solution 2

I had the same issue with a Java application using tibco dll originally intended to run on Win XP. To get it to work on Windows 7, I made the application point to 32-bit JRE. Waiting to see if there is another solution.

Solution 3

Short answer to first question: yes.

Longer answer: maybe; it depends on whether the build process for SVMLight behaves itself on 64-bit windows.

Final note: that call to System.loadLibrary is silly. Either call System.load with a full pathname or let it search java.library.path.

Solution 4

Got this from - http://blog.cedarsoft.com/2010/11/setting-java-library-path-programmatically/

If set the java.library.path, need to have the following lines in order to work.

Field fieldSysPath;
fieldSysPath = ClassLoader.class.getDeclaredField( "sys_paths" );
fieldSysPath.setAccessible( true );
fieldSysPath.set( null, null );

Solution 5

Just go to install download jdk_x86 and it install in Program Files (x86) and set the jre path in your project. Thats it.

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Comments

[Nick Heiner]

How can I switch to a 32 bit JVM? Is that an argument I can pass, or do I need to download and configure something new?

[Artem]

Download and install a 32-bit jvm.

[Nick Heiner]

I asked multiple questions. Which are you answering "yes" to? ha.

[Daniel Pryden]

@Rosarch: Yup, a 64-bit machine can run 32-bit executables. That will be the easiest way to get a 32-bit DLL to work.

[vikingsteve]

Maybe you mea to "use a jvm that is found under Program Files (x86), to ensure it's a 32 bit version" ??

[Janac Meena]

Hi can you elaborate on how you got your app to point to 32-bit JRE? Is that something you did in your IDE or programmatically?

[FiruzzZ]

that's not possible, the location of the file doesn't change anything

[John Perry]

"Yes, you'll have to recompile the DLL for 64-bit." How?