Creating an Integer Object in JNI

Question

I want an Integer object to be return to the java layer from the JNI. The following code crashes when calling NewObject(env, interger, init, rc). What is the proper way to create a Integer object and return it?

jint rc = 0;

jclass intClass = (*env)->FindClass(env, "java/lang/Integer");
if (intClass == NULL) {
    return NULL;
}
jmethodID init =  (*env)->GetMethodID(env, intClass, "intValue", "()I");
if (init == NULL) {
    return NULL;
}
jobject rc_obj = (*env)->NewObject(env, intClass, init, rc);
if (rc_obj == NULL) {
    return NULL;
}

return rc_obj;

Thanks!

Guilherme Campos Hazan · Accepted Answer · 2016-11-14 19:12:03Z

11

Try this:

jclass cls = (*env)->FindClass(env, "java/lang/Integer");
jmethodID midInit = (*env)->GetMethodID(env, cls, "<init>", "(I)V");
if (NULL == midInit) return NULL;
jobject newObj = (*env)->NewObject(env, cls, midInit, number);

answered Nov 14, 2016 at 19:12

Guilherme Campos Hazan

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