#include <jni.h>#include "martin.h"#include <stdio.h>JNIEXPORT void JNICALLJava_martin_myNative(JNIEnv* env, jobject this, jstring s){  jclass cls;  jfieldID fid;  jobject obj;  jmethodID mid;  printf("From C\n");  fflush(stdout);  cls = (*env)->FindClass(env, "java/lang/System");  if (cls == 0) {    printf("java/lang/System lookup failed\n");    return;  }  fid = (*env)->GetStaticFieldID(env, cls, "out", "Ljava/io/PrintStream;");  if (fid == 0) {    printf("java/lang/System::out lookup failed\n");    return;  }  obj = (*env)->GetStaticObjectField(env, cls, fid);  if (obj == 0) {    printf("GetStaticObjectField call failed\n");    return;  }  cls = (*env)->GetObjectClass(env, obj);  if (cls == 0) {    printf("GetObjectClass(out) failed\n");    return;  }  mid = (*env)->GetMethodID(env, cls, "println", "(Ljava/lang/String;)V");  if (mid == 0) {    printf("println method lookup failed\n");    return;  }  (*env)->CallVoidMethod(env, obj, mid, s);}