[SOLVED] How to obtain the name of a Java class from its corresponding jclass?

How to obtain the name of a Java class from its corresponding jclass?

I have a jclass and I need to find out the name of the corresponding Java class. There is a well-received answer on SO for a similar question, however, it requires an object that's an instance of this class: https://stackoverflow.com/a/12730789/634821

I don't always have an instance where having the name of a jclass would be very useful, and I find it hard to believe that Java has no way to find a class's name, which is obviously a static property, with only static methods. So, is it doable, and how?

Solution

A jclass is a jobject subclass that references a java Class object.

So, cut the first few lines off the answer you found:

jclass input = ...; // Class<T>
jclass cls_Class = env->GetObjectClass(input); // Class<Class>

// Find the getName() method on the class object
mid = env->GetMethodID(cls_Class, "getName", "()Ljava/lang/String;");

// Call the getName() to get a jstring object back
jstring strObj = (jstring)env->CallObjectMethod(input, mid);

// Now get the c string from the java jstring object
const char* str = env->GetStringUTFChars(strObj, NULL);

// Print the class name
printf("\nCalling class is: %s\n", str);

// Release the memory pinned char array
env->ReleaseStringUTFChars(strObj, str);