static jclass stringClass = NULL;...if (stringClass == NULL) { jclass localRefCls = (*env)->FindClass(env, "java/lang/String"); if (localRefCls == NULL) { return NULL; /* exception thrown */ } /* Create a global reference */ stringClass = (*env)->NewGlobalRef(env, localRefCls); /* The local reference is no longer useful */ (*env)->DeleteLocalRef(env, localRefCls); /* Is the global reference created successfully? */ if (stringClass == NULL) { return NULL; /* out of memory exception thrown */ }}