loading DLLs created with Cygwin into Sun JDK

Fri Aug 1 04:10:00 GMT 2003

I'm having a problem getting DLLs compiled with Cygwin to load into Sun 
JDK 1.4.1. In the past this has worked, so I hope this is fixable 
without too much work.
Here's an example. Take a simple Java Native Interface method like this:
$ cat jniTest.c
void Java_Test_test () { printf ("test\n");}
And compile it like so:
gcc -shared -o jniTest.dll jniTest.c
Also needed is the Java-side file:
public class Test {
 public native void test ();
 public static void main (String args[]) {
 Test test = new Test ();
 System.out.println ("loading jniTest");
 System.loadLibrary ("jniTest");
 System.out.println ("calling native method");
 test.test ();
 System.out.println ("success");
 }
}
Compiled it like so from a Cygwin terminal (replace 
/cygdrive/i/j2sdk1.4.1_02 as appropriate):
$ /cygdrive/i/j2sdk1.4.1_02/bin/javac Test.java
Now run it, you should see it print "loading jniTest", but nothing more.
$ CLASSPATH=. /cygdrive/i/j2sdk1.4.1_02/bin/java Test
In contrast, relink the DLL, but not using "-mno-cygwin":
$ gcc -mno-cygwin -shared -o jniTest.dll jniTest.c
$ CLASSPATH=. /cygdrive/i/j2sdk1.4.1_02/bin/java Test
Now it should print:
loading jniTest
calling native method
test
success
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/