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

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.

Answer 1

I had a problem when run red5(tomcat) on Windows x64 that previous worked under Windows x32, got next error:

 INFO pool-15-thread-1 com.home.launcher.CommandLauncher - Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\....\lib\Data Samolet.dll: Can't find dependent libraries
INFO pool-15-thread-1 com.home.launcher.CommandLauncher - at java.lang.ClassLoader$NativeLibrary.load(Native Method)

Problem solved when I installed Java x32 version and set next

"Environment variables"

"User variables for Home"

JAVA_HOME => C:\Program Files (x86)\Java\jdk.1.6.0_45

"System variables"

Path[at the beginning] => C:\Program Files\Java\jdk.1.8.0_60;..

Answer 2

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.

Answer 3

Here is an answer for those who compile from the command line/Command Prompt. It doesn't require changing your Path environment variable; it simply lets you use the 32-bit JVM for the program with the 32-bit DLL.

For the compilation, it shouldn't matter which javac gets used - 32-bit or 64-bit.

>javac MyProgramWith32BitNativeLib.java

For the actual execution of the program, it is important to specify the path to the 32-bit version of java.exe

I'll post a code example for Windows, since that seems to be the OS used by the OP.

Windows

Most likely, the code will be something like:

>"C:\Program Files (x86)\Java\jre#.#.#_###\bin\java.exe" MyProgramWith32BitNativeLib 

The difference will be in the numbers after jre. To find which numbers you should use, enter:

>dir "C:\Program Files (x86)\Java\"

On my machine, the process is as follows

C:\Users\me\MyProject>dir "C:\Program Files (x86)\Java"
 Volume in drive C is Windows
 Volume Serial Number is 0000-9999

 Directory of C:\Program Files (x86)\Java

11/03/2016  09:07 PM    <DIR>          .
11/03/2016  09:07 PM    <DIR>          ..
11/03/2016  09:07 PM    <DIR>          jre1.8.0_111
               0 File(s)              0 bytes
               3 Dir(s)  107,641,901,056 bytes free

C:\Users\me\MyProject>

So I know that my numbers are 1.8.0_111, and my command is

C:\Users\me\MyProject>"C:\Program Files (x86)\Java\jre1.8.0_111\bin\java.exe" MyProgramWith32BitNativeLib

Answer 4

Go to

Project properties >> Run >> VM options

and put this address:

-Djava.library.path="C:\opencv\build\java\x64"

Answer 5

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 );

Answer 6

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