Issue creating Java Native Interface(JNI) - java-native-interface

Question

As the title suggested i need some help creating JNI wrapper for this method
std::shared_ptr<xxx::FooInterface> createFooFactory() noexcept;
The error that i am getting is this
/Volumes/../../projects/xxx_fooFactory.cpp:34:19: error: reinterpret_cast from
'std::__ndk1::shared_ptr<xxx::FooInterface>' to 'jlong' (aka 'long long') is not allowed
return reinterpret_cast<jlong>(nativeObject);
I am not able to figure out what i am missing or doing wrong, All the related code are as follows, would be great if someone can provide feedback/advice as to what i might be missing. I must mention that this would be my first time writing jni wrapper.
I have a class
FooFactory.java
package xxx.FooFactory;
import PlatformInterface;
public class FooFactory extends PlatformInterface {
protected FooFactory() {
super();
setNativeObject(nCreate());
}
#Override
public void destroyNativeObject(long nativeObject) {
destroyNativeObject(nativeObject);
}
private static native long nCreate();
private static native void nDestroy(long nativeObject);
}
AutoGenerated jni header xxx_fooFactory.h
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class xxx_fooFactory */
#ifndef _Included_xxx_fooFactory
#define _Included_xxx_fooFactory
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: xxx_fooFactory
* Method: nCreate
* Signature: ()J
*/
JNIEXPORT jlong JNICALL Java_xxx_fooFactory_nCreate
(JNIEnv *, jclass);
/*
* Class: xxx_fooFactory
* Method: nDestroy
* Signature: (J)V
*/
JNIEXPORT void JNICALL Java_xxx_fooFactory_nDestroy
(JNIEnv *, jclass, jlong);
#ifdef __cplusplus
}
#endif
#endif
xxx_fooFactory.cpp
#include <jni.h>
#include "xxx_fooFactory.h"
....
#include <xxx/FooFactory.h>
using namespace xxx;
extern "C" {
/*
* Class: xxx_fooFactory
* Method: nCreate
* Signature: ()J
*/
JNIEXPORT jlong JNICALL Java_xxx_fooFactory_nCreate
(JNIEnv *env, jclass) {
JAVA_BINDING_TRY{
auto fooFactory = createFooFactory();
if (fooFactory == nullptr) {
throw JavaBindingException(JavaBindingException::kIllegalStateException, "Unable to create foo factory.");
}
auto nativeObject = std::shared_ptr<FooInterface>(fooFactory);
return reinterpret_cast<jlong>(nativeObject);
}
JAVA_BINDING_CATCH(env);
return 0;
}
/*
* Class: xxx_fooFactory
* Method: nDestroy
* Signature: (J)V
*/
JNIEXPORT void JNICALL Java_xxx_fooFactory_nDestroy
(JNIEnv *env, jclass, jlong nativeObject) {
JAVA_BINDING_TRY {
if (nativeObject == 0) return;
delete reinterpret_cast<std::shared_ptr<FooInterface>*>(nativeObject);
} JAVA_BINDING_CATCH(env);
}
}