diff --git a/java/jni/com_zerotierone_sdk_Node.cpp b/java/jni/com_zerotierone_sdk_Node.cpp
index fe8c8c3ea..81af5e3f8 100644
--- a/java/jni/com_zerotierone_sdk_Node.cpp
+++ b/java/jni/com_zerotierone_sdk_Node.cpp
@@ -65,7 +65,12 @@ namespace {
     };
 
 
-    int VirtualNetworkConfigFunctionCallback(ZT1_Node *node,void *userData,uint64_t nwid,enum ZT1_VirtualNetworkConfigOperation operation, const ZT1_VirtualNetworkConfig *config)
+    int VirtualNetworkConfigFunctionCallback(
+        ZT1_Node *node,
+        void *userData,
+        uint64_t nwid,
+        enum ZT1_VirtualNetworkConfigOperation operation,
+        const ZT1_VirtualNetworkConfig *config)
     {
         JniRef *ref = (JniRef*)userData;
         assert(ref->node == node);
@@ -110,14 +115,49 @@ namespace {
         return env->CallIntMethod(ref->configListener, callbackMethod, (jlong)nwid, operationObject, networkConfigObject);
     }
 
-    void VirtualNetworkFrameFunctionCallback(ZT1_Node *node,void *userData,uint64_t,uint64_t,uint64_t,unsigned int,unsigned int,const void *,unsigned int)
+    void VirtualNetworkFrameFunctionCallback(ZT1_Node *node,void *userData,
+        uint64_t nwid,
+        uint64_t sourceMac,
+        uint64_t destMac,
+        unsigned int etherType,
+        unsigned int vlanid,
+        const void *frameData,
+        unsigned int frameLength)
     {
         JniRef *ref = (JniRef*)userData;
         assert(ref->node == node);
 
         JNIEnv *env = ref->env;
+
+        static jclass frameListenerClass = NULL;
+        static jmethodID callbackMethod = NULL;
+
+        if(frameListenerClass == NULL)
+        {
+            frameListenerClass = env->GetObjectClass(ref->frameListener);
+            if(frameListenerClass == NULL)
+            {
+                return;
+            }
+        }
+
+        if(callbackMethod == NULL)
+        {
+            callbackMethod = env->GetMethodID(frameListenerClass,
+                "onVirtualNetworkFrame", "(JJJJJ[B)V");
+            if(callbackMethod == NULL)
+            {
+                return;
+            }
+        }
+
+        jbyteArray dataArray = env->NewByteArray(frameLength);
+        env->SetByteArrayRegion(dataArray, 0, frameLength, (jbyte*)frameData);
+
+        env->CallVoidMethod(ref->frameListener, callbackMethod, nwid, sourceMac, destMac, etherType, vlanid, dataArray);
     }
 
+
     void EventCallback(ZT1_Node *node,void *userData,enum ZT1_Event,const void *)
     {
         JniRef *ref = (JniRef*)userData;
diff --git a/java/src/com/zerotierone/sdk/VirtualNetworkFrameListener.java b/java/src/com/zerotierone/sdk/VirtualNetworkFrameListener.java
index fed5d95c5..a38cd722d 100644
--- a/java/src/com/zerotierone/sdk/VirtualNetworkFrameListener.java
+++ b/java/src/com/zerotierone/sdk/VirtualNetworkFrameListener.java
@@ -24,17 +24,17 @@
  * redistribute it in a modified binary form, please contact ZeroTier Networks
  * LLC. Start here: http://www.zerotier.com/
  */
+
 package com.zerotierone.sdk;
 
 import java.nio.ByteBuffer;
 
 public interface VirtualNetworkFrameListener {
-    void onVirtualNetworkFrame(Node node,
+    void onVirtualNetworkFrame(
                 long nwid,
                 long srcMac,
                 long destMac,
                 long etherType,
                 long vlanId,
-                ByteBuffer frameData,
-                long len);
+                byte[] frameData);
 }