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Thread: java.lang.UnsatisfiedLinkError

  1. #1
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    Default java.lang.UnsatisfiedLinkError

    Hello,

    I am getting the following error. Please advide where I may be going wrong.

    Exception in thread "main" java.lang.UnsatisfiedLinkError: Plcio.open(Ljava/lang/StringI
    at Plcio.open(Native Method)
    at Plcio.main(Plcio.java:11)


    Plcio.java

    public class Plcio {
    	private native int open(String plcName);
    	static {
    		//System.loadLibrary("test");
    		System.load("/home/usr/plcioExampleslib/libtest.so");
    	}
     
     
    	public static void main(String[] args) {
    		Plcio plcio = new Plcio();
    		int result = plcio.open("virtual");
    		System.out.println("result = " + result);
    	}
    }


    Plc.h

    #ifndef _PLC_H
    #define _PLC_H
     
    #include<iostream>
    #include<string>
    #include<vector>
    #include<plc.h>
    #include<jni.h>
     
    typedef PLC* plcPointer;
     
    class Plc{
     
    public:
    	Plc() { }
    	Plc(const std::string &plctype, const std::vector<int> &data):_plctype(plctype),_data(data) {}
     
    	JNIEXPORT jint JNICALL Java_Plcio_open (JNIEnv *env, jobject jobj, jstring name) ;
     
    private:
    	plcPointer _ptr;
    	const std::string _plctype;
    	std::vector<int> _data;
    };
     
     
    #endif



    Plc.cpp

    #include "Plc.h"
    #include <jni.h>
     
    using namespace std;
     
    JNIEXPORT jint JNICALL  Plc::Java_Plcio_open (JNIEnv *env, jobject jobj, jstring name) {
     
      const char *plcname = (env)->GetStringUTFChars(name, 0);
      _ptr = plc_open(const_cast<char*>(plcname));
      env->ReleaseStringUTFChars(name, plcname);
     
      if(_ptr == NULL) {
        plc_print_error(_ptr, "plc_open\n");
        return -1;
      } else 
          cout << " open successfully " << endl; 
      return 0;    
    }



    Regards,

    -H

  2. #2
    Administrator copeg's Avatar
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    Default Re: java.lang.UnsatisfiedLinkError

    Look at the API for System.load:
    PHP Code:
    Throws:
        
    UnsatisfiedLinkError - if the file does not exist
    Verify the path and file name you are trying to load /home/usr/plcioExampleslib/libtest.so

  3. #3
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    Default Re: java.lang.UnsatisfiedLinkError

    Thank you for your reply. I am certain that the path exists and the library is present in the path.

    Regards,

    -H

  4. #4
    Senile Half-Wit Freaky Chris's Avatar
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    Default Re: java.lang.UnsatisfiedLinkError

    (env)->GetStringUTFChars(name, 0);

    Becomes

    (env)->GetStringUTFChars(env, name, null);

    Chris
    chris[at]javaprogrammingforums[dot]com

    Prifysgol Bangor University, North Wales

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