Accesing Java enums values from C++ with JNI

Imagine we have to acces the enum values of a Java class. For example:

public enum ComponentCode {
    VAD_CODE ((byte)1),
    DIARIZATOR_CODE ((byte)2),
    FEATURES_EXTRACTOR_CODE((byte)3),
    UBM_CODE((byte)4),
    HYPERPARAMS_CODE((byte)5),
    GENDER_ID_CODE((byte)6),
    MODEL_TRAINER_CODE((byte)7),
    STATS_GENERATOR_CODE((byte)8);
 
    private byte code;
 
    ComponentCode (byte code) {
        this.code = code;
    }
 
    public byte getCode () {
        return code;
    }
 
    @Override
    public String toString () {
        return "" + (int)code;
    }
 
};

The following C function can be used to acces the enum values:

jobject getStaticFieldID(JNIEnv *env, jclass c, const char *name, const char *signature)
{
    jfieldID field = env->GetStaticFieldID (c, name, signature);
    if (NULL == field) {
        std::string msg = std::string("Error finding field ") + std::string(name) +
            std::string(" (") + std::string(signature) + std::string(")");
        throwFrontEndException(env, msg.c_str());
    }
    jobject obj = env->GetStaticObjectField(c, field);
    if (NULL == obj) {
        std::string msg = std::string("Error finding field ") + std::string(name) +
            std::string(" (") + std::string(signature) + std::string(")");
        throwFrontEndException(env, msg.c_str());
    }
 
    return obj;
}