Re: Calling Nim compiled to dll from Java programs?

[alexsad]

What have I changed: in Sample1.java main function now is:
    
    
    public static void main(String[] args) {
        System.loadLibrary("Sample1");
        Sample1 sample = new Sample1();
        int     square = sample.intMethod(5);
        boolean bool   = sample.booleanMethod(true);
        String text        = "";
            
            for(int i=0; i<1000; i++){
                    text   = sample.stringMethod("JAVA"+i);
            }
        
        int     sum    = sample.intArrayMethod(new int[]{1,1,2,3,5,8,13} );
        
        System.out.println("intMethod: " + square);
        System.out.println("booleanMethod: " + bool);
        System.out.println("stringMethod: " + text);
        System.out.println("intArrayMethod: " + sum);
      }
    

in Sample1.nim proc Java_Sample1_stringMethod now is: 
    
    
    proc Java_Sample1_stringMethod(env: ptr JNIEnv, obj: jobject, input: 
jstring): jstring {.JNIEXPORT.} =
      
      var isCopy: jboolean
      var str = env[].GetStringUTFChars(env, input, isCopy)
      var cap = $str
      
      cap.add("test")
      
      
      env[].ReleaseStringUTFChars(env, input, str)
      result = env[].NewStringUTF(env, cap)
    

Then I get EXCEPTION_ACCESS_VIOLATION (0xc0000005)

tested with:

> javac 1.8.0_20
> 
> java version "1.8.0_25" Java(TM) SE Runtime Environment (build 1.8.0_25-b18) 
> Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)
> 
> gcc (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 5.3.0
> 
> Nim Compiler Version 0.14.3 (2016-07-13) [Windows: amd64]

Thanks...