Problem

[Venkat]

Hi All,

I am trying to write a simple program in Java using JNI, the program has to
load a C++ interface using JNI.
I am getting the following error, could someone help me out in resolving
this error.

java.lang.UnsatisfiedLinkError: no hello.dll in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1491)
at java.lang.Runtime.loadLibrary0(Runtime.java:788)
at java.lang.System.loadLibrary(System.java:834)
at examples.texteditor.HelloWorld.<clinit>(HelloWorld.java:21)
Exception in thread "main"

I had installed JDK 1.4.2 and J2EE 1.4 SDK on my machine.


Thanks,
Venkat

 

[Chris Smith]

java.lang.UnsatisfiedLinkError: no hello.dll in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1491)
at java.lang.Runtime.loadLibrary0(Runtime.java:788)
at java.lang.System.loadLibrary(System.java:834)
at examples.texteditor.HelloWorld.<clinit>(HelloWorld.java:21)
Exception in thread "main"

I had installed JDK 1.4.2 and J2EE 1.4 SDK on my machine.

The problem is that there is no hello.dll in java.library.path. Where
is hello.dll, and what does the line of code look like where you load
it? What is the output of System.getProperty("java.library.path")?

--
www.designacourse.com
The Easiest Way to Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation

 

[Venkat]

The problem is that there is no hello.dll in java.library.path. Where

is hello.dll, and what does the line of code look like where you load
it? What is the output of System.getProperty("java.library.path")?

Hi Chris,

The Java File is as follows:

/*
* Class.java
*
* Created on July 9, 2004, 10:19 AM
*/


package examples.texteditor;
import java.io.*;

/**
*
* @author amaller
*/
public class HelloWorld {

public native void displayHelloWorld();

static
{
System.out.print(System.getProperty("java.library.path"));
System.loadLibrary("hello.dll");
}

public static void main(String ars[])
{
new HelloWorld().displayHelloWorld();
/* System.out.print("Hi Test");*/
}
/** Creates a new instance of Class */

}

Java.library.Path is
'C:\j2sdk1.4.2_04\jre\bin;.;C:\WINNT\system32;C:\WINNT;D:\Perl\bin\;C:\WINNT
\system32;C:\WINNT;C:\WINNT\System32\Wbem;d:\Program
Files\ClearCase\bin;C:\Program Files\Microsoft SQL
Server\80\Tools\BINN;C:\j2sdk1.4.2_04\bin;C:\j2sdk1.4.2_04\lib;C:\j2sdk1.4.2
_04\jre;C:\j2sdk1.4.2_04\include;C:\Sun\AppServer\bin;D:\Perl\bin\;C:\WINNT\
system32;C:\WINNT;C:\WINNT\System32\Wbem;d:\Program
Files\ClearCase\bin;C:\Program Files\Microsoft SQL
Server\80\Tools\BINN;C:\j2sdk1.4.2_04\bin'

I had placed the hello.dll into 'C:\j2sdk1.4.2_04\jre\bin' and still it
gives error.

Any idea on how can i get rid of this error.


Thanks,
Venkat

 

[Chris Smith]

The Java File is as follows:
[...]
System.loadLibrary("hello.dll");

That should be System.loadLibrary("hello"). The point of loadLibrary is
to use a system-independent library name. For example,
loadLibrary("hello") will load hello.dll on a Windows system, but will
load libhello.so instead on a typical UNIX system. I don't know what
will happen when you pass "hello.dll" to loadLibrary; very likely, it's
looking for a library called "hello.dll.dll", and on a UNIX system it
would look for "libhello.dll.so". Neither of those are likely to exist
in their respective environments.

Everything else looks like it should work.

--
www.designacourse.com
The Easiest Way to Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation