Hi guys I need some help. I've made a little program written in c that
compiles well with gcc. After compiling, i created a shared library with
ld, without any problems again. But, when trying to load the library from a
java code, i get an error saying:

Exception in thread "main" java.lang.UnsatisfiedLinkError:
/home/damjan/jbproject/progetto/classes/progetto/libfasta.so:
/home/damjan/jbproject/progetto/classes/progetto/libfasta.so: undefined
symbol: _ZNSaIcEC1Ev
       at java.lang.ClassLoader$NativeLibrary.load(Native Method)
       at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1560)
       at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1485)
       at java.lang.Runtime.loadLibrary0(Runtime.java:788)
       at java.lang.System.loadLibrary(System.java:834)
       at progetto.Mojpanel.<clinit>(Mojpanel.java:20)

Here is my code:

#include <jni.h>
#include "Frame1.h"
#include <cstring>
#include <fstream>
#include <iostream>

#include "c++/Biosequence.h"

extern "C" {
using namespace std;
JNIEXPORT void JNICALL Java_Frame1_fasta (JNIEnv *env, jobject obj, jstring
fastaname) {
   Biosequence* s;
   const char *name = env->GetStringUTFChars(fastaname, 0);
   string fastapath = "";
   fastapath = name;
   ifstream fin(fastapath.c_str());
   if (!fin.is_open()) {
     cout << "Unable to open " << fastapath << endl;
     exit(1);
   }
   s = new Biosequence(fin);
   fin.close();
   cout << s->getInfo() << endl;
   s->setName(fastapath);
   s->buildSuffixTree(SuffixTree::LAZY_STRATEGY);
   env->ReleaseStringUTFChars(fastaname, name);
   printf("Funzionaaaaaa!!\n");
 }
} // end extern "C"

One more thing:
I tried to see some details of the library created with the linux comand nm,
and realize that that probably the part of the code which is problematic
is: std::allocator<char>::allocator() but i don't know why. Maybe for some
string - char incompatibility.

P.S. I'm working on JBuilderX under Mandrake Linux 9.2 with jdk 1.4
P.P.S. I tried to make an equivalent selfstanding program in c without jni
features, and it worked fine. Probably