Method toString

bindings/java/JavaWorkload.cpp:195–208

	}

	std::string toString() {
		if (!throwable) {
			return "JNIError";
		} else {
			jboolean isCopy = false;
			jmethodID toStringM =
			    env->GetMethodID(env->FindClass("java/lang/Object"), "toString", "()Ljava/lang/String;");
			jstring s = (jstring)env->CallObjectMethod(throwable, toStringM);
			const char* utf = env->GetStringUTFChars(s, &isCopy);
			std::string res(utf);
			env->ReleaseStringUTFChars(s, utf);
			return res;
		}
	}
};

struct JVM {