diff --git a/libs/lpac-jni/src/main/jni/lpac-jni/interface-wrapper.c b/libs/lpac-jni/src/main/jni/lpac-jni/interface-wrapper.c
index be490fd..6b41a3a 100644
--- a/libs/lpac-jni/src/main/jni/lpac-jni/interface-wrapper.c
+++ b/libs/lpac-jni/src/main/jni/lpac-jni/interface-wrapper.c
@@ -14,21 +14,30 @@ static jmethodID method_http_transmit;
 static jfieldID field_resp_rcode;
 static jfieldID field_resp_data;
 
+#define APDU_INTERFACE_CLASS PACKAGE_NAME "/ApduInterface"
+#define HTTP_INTERFACE_CLASS PACKAGE_NAME "/HttpInterface"
+#define HTTP_RESPONSE_CLASS HTTP_INTERFACE_CLASS "$HttpResponse"
+
 void interface_wrapper_init(JNIEnv *env) {
-    jclass apdu_class = (*env)->FindClass(env, "net/typeblog/lpac_jni/ApduInterface");
+    jclass apdu_class = (*env)->FindClass(env, APDU_INTERFACE_CLASS);
     method_apdu_connect = (*env)->GetMethodID(env, apdu_class, "connect", "()V");
     method_apdu_disconnect = (*env)->GetMethodID(env, apdu_class, "disconnect", "()V");
-    method_apdu_logical_channel_open = (*env)->GetMethodID(env, apdu_class, "logicalChannelOpen",
-                                                           "([B)I");
-    method_apdu_logical_channel_close = (*env)->GetMethodID(env, apdu_class, "logicalChannelClose",
-                                                            "(I)V");
+    method_apdu_logical_channel_open = (*env)->GetMethodID(env, apdu_class, "logicalChannelOpen", "([B)I");
+    method_apdu_logical_channel_close = (*env)->GetMethodID(env, apdu_class, "logicalChannelClose", "(I)V");
     method_apdu_transmit = (*env)->GetMethodID(env, apdu_class, "transmit", "(I[B)[B");
 
-    jclass http_class = (*env)->FindClass(env, "net/typeblog/lpac_jni/HttpInterface");
-    method_http_transmit = (*env)->GetMethodID(env, http_class, "transmit",
-                                               "(Ljava/lang/String;[BLjava/util/List;)Lnet/typeblog/lpac_jni/HttpInterface$HttpResponse;");
+    jclass http_class = (*env)->FindClass(env, HTTP_INTERFACE_CLASS);
+    method_http_transmit = (*env)->GetMethodID(
+            env, http_class, "transmit",
+            "("
+            "Ljava/lang/String;" // url
+            "[B" // byte array
+            "Ljava/util/List;" // headers
+            ")"
+            "L" HTTP_RESPONSE_CLASS ";"
+    );
 
-    jclass resp_class = (*env)->FindClass(env, "net/typeblog/lpac_jni/HttpInterface$HttpResponse");
+    jclass resp_class = (*env)->FindClass(env, HTTP_RESPONSE_CLASS);
     field_resp_rcode = (*env)->GetFieldID(env, resp_class, "rcode", "I");
     field_resp_data = (*env)->GetFieldID(env, resp_class, "data", "[B");
 }
@@ -36,7 +45,7 @@ void interface_wrapper_init(JNIEnv *env) {
 static int apdu_interface_connect(struct euicc_ctx *ctx) {
     LPAC_JNI_SETUP_ENV;
     (*env)->CallVoidMethod(env, LPAC_JNI_CTX(ctx)->apdu_interface, method_apdu_connect);
-    LPAC_JNI_EXCEPTION_RETURN;
+    LPAC_JNI_EXCEPTION_RETURN
     return 0;
 }
 
@@ -52,7 +61,7 @@ apdu_interface_logical_channel_open(struct euicc_ctx *ctx, const uint8_t *aid, u
     (*env)->SetByteArrayRegion(env, jbarr, 0, aid_len, (const jbyte *) aid);
     jint ret = (*env)->CallIntMethod(env, LPAC_JNI_CTX(ctx)->apdu_interface,
                                      method_apdu_logical_channel_open, jbarr);
-    LPAC_JNI_EXCEPTION_RETURN;
+    LPAC_JNI_EXCEPTION_RETURN
     LPAC_JNI_CTX(ctx)->logical_channel_id = ret;
     return ret;
 }
@@ -71,13 +80,13 @@ apdu_interface_transmit(struct euicc_ctx *ctx, uint8_t **rx, uint32_t *rx_len, c
                         uint32_t tx_len) {
     const int logic_channel = LPAC_JNI_CTX(ctx)->logical_channel_id;
     LPAC_JNI_SETUP_ENV;
-    jbyteArray txArr = (*env)->NewByteArray(env, tx_len);
-    (*env)->SetByteArrayRegion(env, txArr, 0, tx_len, (const jbyte *) tx);
+    jbyteArray txArr = (*env)->NewByteArray(env, (jsize) tx_len);
+    (*env)->SetByteArrayRegion(env, txArr, 0, (jsize) tx_len, (const jbyte *) tx);
     jbyteArray ret = (jbyteArray) (*env)->CallObjectMethod(
             env, LPAC_JNI_CTX(ctx)->apdu_interface,
             method_apdu_transmit, logic_channel, txArr
     );
-    LPAC_JNI_EXCEPTION_RETURN;
+    LPAC_JNI_EXCEPTION_RETURN
     *rx_len = (*env)->GetArrayLength(env, ret);
     *rx = calloc(*rx_len, sizeof(uint8_t));
     (*env)->GetByteArrayRegion(env, ret, 0, (jsize) *rx_len, (jbyte *) *rx);
@@ -99,7 +108,7 @@ http_interface_transmit(struct euicc_ctx *ctx, const char *url, uint32_t *rcode,
 
     jobject ret = (*env)->CallObjectMethod(env, LPAC_JNI_CTX(ctx)->http_interface,
                                            method_http_transmit, jurl, txArr, header_list);
-    LPAC_JNI_EXCEPTION_RETURN;
+    LPAC_JNI_EXCEPTION_RETURN
     *rcode = (*env)->GetIntField(env, ret, field_resp_rcode);
     jbyteArray rxArr = (jbyteArray) (*env)->GetObjectField(env, ret, field_resp_data);
     *rx_len = (*env)->GetArrayLength(env, rxArr);
diff --git a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c
index b1ab73e..0562995 100644
--- a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c
+++ b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c
@@ -174,18 +174,25 @@ Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(
 }
 
 JNIEXPORT void JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_cancelSessions(JNIEnv *env, jobject thiz, jlong handle) {
+Java_net_typeblog_lpac_1jni_LpacJni_cancelSessions(
+        __attribute__((unused)) JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     es9p_cancel_session(ctx);
     es10b_cancel_session(ctx, ES10B_CANCEL_SESSION_REASON_UNDEFINED);
     euicc_http_cleanup(ctx);
 }
 
-#define QUOTE(S) #S
-#define ERRCODE_ENUM_TO_STRING(VARIANT) case VARIANT: return toJString(env, QUOTE(VARIANT))
+#define ERRCODE_ENUM_TO_STRING(VARIANT) case VARIANT: return toJString(env, #VARIANT)
 
 JNIEXPORT jstring JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_downloadErrCodeToString(JNIEnv *env, jobject thiz, jint code) {
+Java_net_typeblog_lpac_1jni_LpacJni_downloadErrCodeToString(
+        JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jint code
+) {
     switch (code) {
         ERRCODE_ENUM_TO_STRING(ES10B_ERROR_REASON_INCORRECT_INPUT_VALUES);
         ERRCODE_ENUM_TO_STRING(ES10B_ERROR_REASON_INVALID_SIGNATURE);
diff --git a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-jni.c b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-jni.c
index 9196ff7..d4fddd0 100644
--- a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-jni.c
+++ b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-jni.c
@@ -16,7 +16,7 @@ JavaVM *jvm = NULL;
 
 #define LOCAL_PROFILE_INFO_CLASS "net/typeblog/lpac_jni/LocalProfileInfo"
 
-jint JNI_OnLoad(JavaVM *vm, void *reserved) {
+jint JNI_OnLoad(JavaVM *vm, __attribute__((unused)) void *reserved) {
     jvm = vm;
     LPAC_JNI_SETUP_ENV;
 
@@ -30,7 +30,7 @@ jint JNI_OnLoad(JavaVM *vm, void *reserved) {
 JNIEXPORT jlong JNICALL
 Java_net_typeblog_lpac_1jni_LpacJni_createContext(
         JNIEnv *env,
-        jobject thiz,
+        __attribute__((unused)) jobject thiz,
         jbyteArray isdr_aid,
         jobject apdu_interface,
         jobject http_interface
@@ -61,7 +61,11 @@ Java_net_typeblog_lpac_1jni_LpacJni_createContext(
 }
 
 JNIEXPORT void JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_destroyContext(JNIEnv *env, jobject thiz, jlong handle) {
+Java_net_typeblog_lpac_1jni_LpacJni_destroyContext(
+        JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     struct lpac_jni_ctx *jni_ctx = LPAC_JNI_CTX(ctx);
 
@@ -73,26 +77,42 @@ Java_net_typeblog_lpac_1jni_LpacJni_destroyContext(JNIEnv *env, jobject thiz, jl
 }
 
 JNIEXPORT jint JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_euiccInit(JNIEnv *env, jobject thiz, jlong handle) {
+Java_net_typeblog_lpac_1jni_LpacJni_euiccInit(
+        __attribute__((unused)) JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     return euicc_init(ctx);
 }
 
 JNIEXPORT void JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_euiccFini(JNIEnv *env, jobject thiz, jlong handle) {
+Java_net_typeblog_lpac_1jni_LpacJni_euiccFini(
+        __attribute__((unused)) JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     euicc_fini(ctx);
 }
 
 JNIEXPORT void JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_euiccSetMss(JNIEnv *env, jobject thiz, jlong handle,
-                                                jbyte mss) {
+Java_net_typeblog_lpac_1jni_LpacJni_euiccSetMss(
+        __attribute__((unused)) JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle,
+        jbyte mss
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     ctx->es10x_mss = (uint8_t) mss;
 }
 
 JNIEXPORT jstring JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_es10cGetEid(JNIEnv *env, jobject thiz, jlong handle) {
+Java_net_typeblog_lpac_1jni_LpacJni_es10cGetEid(
+        __attribute__((unused)) JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     char *buf = NULL;
 
@@ -155,8 +175,13 @@ Java_net_typeblog_lpac_1jni_LpacJni_es10cGetProfilesInfo(
 }
 
 JNIEXPORT jint JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_es10cEnableProfile(JNIEnv *env, jobject thiz, jlong handle,
-                                                       jstring iccid, jboolean refresh) {
+Java_net_typeblog_lpac_1jni_LpacJni_es10cEnableProfile(
+        JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle,
+        jstring iccid,
+        jboolean refresh
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     const char *_iccid = NULL;
     int ret;
@@ -168,8 +193,13 @@ Java_net_typeblog_lpac_1jni_LpacJni_es10cEnableProfile(JNIEnv *env, jobject thiz
 }
 
 JNIEXPORT jint JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_es10cDisableProfile(JNIEnv *env, jobject thiz, jlong handle,
-                                                        jstring iccid, jboolean refresh) {
+Java_net_typeblog_lpac_1jni_LpacJni_es10cDisableProfile(
+        JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle,
+        jstring iccid,
+        jboolean refresh
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     const char *_iccid = NULL;
     int ret;
@@ -181,8 +211,13 @@ Java_net_typeblog_lpac_1jni_LpacJni_es10cDisableProfile(JNIEnv *env, jobject thi
 }
 
 JNIEXPORT jint JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_es10cSetNickname(JNIEnv *env, jobject thiz, jlong handle,
-                                                     jstring iccid, jbyteArray nick) {
+Java_net_typeblog_lpac_1jni_LpacJni_es10cSetNickname(
+        JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle,
+        jstring iccid,
+        jbyteArray nick
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     const char *_iccid = NULL;
     jbyte *_nick = NULL;
@@ -197,8 +232,12 @@ Java_net_typeblog_lpac_1jni_LpacJni_es10cSetNickname(JNIEnv *env, jobject thiz,
 }
 
 JNIEXPORT jint JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_es10cDeleteProfile(JNIEnv *env, jobject thiz, jlong handle,
-                                                       jstring iccid) {
+Java_net_typeblog_lpac_1jni_LpacJni_es10cDeleteProfile(
+        JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle,
+        jstring iccid
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     const char *_iccid = NULL;
     int ret;
@@ -210,7 +249,11 @@ Java_net_typeblog_lpac_1jni_LpacJni_es10cDeleteProfile(JNIEnv *env, jobject thiz
 }
 
 JNIEXPORT jobject JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_es10cexGetEuiccInfo2(JNIEnv *env, jobject thiz, jlong handle) {
+Java_net_typeblog_lpac_1jni_LpacJni_es10cexGetEuiccInfo2(
+        JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     struct es10c_ex_euiccinfo2 *info = malloc(sizeof(struct es10c_ex_euiccinfo2));
     jobject ret = NULL;
@@ -253,7 +296,11 @@ Java_net_typeblog_lpac_1jni_LpacJni_es10cexGetEuiccInfo2(JNIEnv *env, jobject th
 }
 
 JNIEXPORT jint JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_es10cEuiccMemoryReset(JNIEnv *env, jobject thiz, jlong handle) {
+Java_net_typeblog_lpac_1jni_LpacJni_es10cEuiccMemoryReset(
+        __attribute__((unused)) JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     return es10c_euicc_memory_reset(ctx);
 }
diff --git a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-notifications.c b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-notifications.c
index a581d40..085074d 100644
--- a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-notifications.c
+++ b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-notifications.c
@@ -52,8 +52,12 @@ Java_net_typeblog_lpac_1jni_LpacJni_es10bListNotification(
 }
 
 JNIEXPORT jint JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_handleNotification(JNIEnv *env, jobject thiz, jlong handle,
-                                                       jlong seq_number) {
+Java_net_typeblog_lpac_1jni_LpacJni_handleNotification(
+        __attribute__((unused)) JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle,
+        jlong seq_number
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     struct es10b_pending_notification notification;
     int res;
@@ -76,8 +80,12 @@ Java_net_typeblog_lpac_1jni_LpacJni_handleNotification(JNIEnv *env, jobject thiz
 }
 
 JNIEXPORT jint JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_es10bDeleteNotification(JNIEnv *env, jobject thiz, jlong handle,
-                                                            jlong seq_number) {
+Java_net_typeblog_lpac_1jni_LpacJni_es10bDeleteNotification(
+        __attribute__((unused)) JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle,
+        jlong seq_number
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     return es10b_remove_notification_from_list(ctx, (unsigned long) seq_number);
 }