diff --git a/src/class.js b/src/class.js
index 9d1d344..efd1039 100644
--- a/src/class.js
+++ b/src/class.js
@@ -22,7 +22,7 @@ function slurpFile (filename, fa) {
     } else if ('responseType' in xmlHttpRequest) {
         xmlHttpRequest.responseType = 'arraybuffer';
     } else {
-        xmlHttpRequest.overrideMimeType('text/plain; charset=x-user-defined');
+        //xmlHttpRequest.overrideMimeType('text/plain; charset=x-user-defined');
     }
     xmlHttpRequest.send(null);
     if (xmlHttpRequest.status != 200 && xmlHttpRequest.status != 0) {
@@ -42,6 +42,11 @@ function slurpFile (filename, fa) {
     if (bf) {
         result = [response.byteLength, response];
     } else {
+        var a = "";
+        for(var k in xmlHttpRequest){
+            a+=k+",";
+        }
+        alert(a)
         throw "No typed arrays";
     }
     return result;
diff --git a/src/cpu.js b/src/cpu.js
index 7313783..872bc93 100644
--- a/src/cpu.js
+++ b/src/cpu.js
@@ -16,7 +16,9 @@
 
 /** @constructor */
 var JVM = function(params,args){
-    this.nativeMappingTable = {}
+    this.JNITable = params.JNITable || {}
+    this.internalJNITable = 
+#include "internalJNI.jsh"
     this.params = params;
     this.args = args; 
     this.method_area = {};
@@ -40,7 +42,10 @@ var JVM = function(params,args){
     
     this.makeInstanceOfStringFromJSSTring = function(string){
         var inst = this.java_lang_string.makeInstance();
-        inst["java/lang/String value"] = string;
+        inst["java/lang/String count"] = string.length;
+        var x = make1DNativeArray(string.length,true,T_CHAR);
+        x.value = string.toArray();
+        inst["java/lang/String value"] = x;
         inst["java/lang/String hash"] = this.stringHashCode(string)
         return inst;
     }
@@ -56,7 +61,7 @@ var JVM = function(params,args){
             
             LOG("[Loaded " + name  + "]");
         }
-        
+        loaded_class.initializeClass();
         return loaded_class;
         
     }
diff --git a/src/infos.js b/src/infos.js
index 653d820..3290d16 100644
--- a/src/infos.js
+++ b/src/infos.js
@@ -11,11 +11,48 @@
 
 #include "constantPool.jsh"
 
-function parseArgs(description){
-//     "([Ljava/lang/String;)V"
-    var length = description.length
-    var sides = description.substr(1,length).split(")")
-    return {args:sides[0].split(","),ret:sides[1]};
+#define DSCRPT_DEFAULT   0
+#define DSCRPT_ARRAY     1
+#define DSCRPT_OBJ       2
+
+function parseArgs(descriptor){
+    var sides = descriptor.substr(1,descriptor.length).split(")")
+    var result = sides[1];
+    var args = sides[0];
+    var argsA = []
+    var state = DSCRPT_DEFAULT;
+    var temp = "";
+    for (var i=0; i<args.length; i++){
+        switch(args[i]){
+            case "[":
+            state = DSCRPT_ARRAY;
+            temp += args[i];
+            break;
+            case "L":
+            state = DSCRPT_OBJ;
+            temp += args[i]
+            break;
+            case ";":
+            if (state != DSCRPT_OBJ){
+                PANIC("DESCRIPTOR ERROR");
+            }
+            temp += args[i]
+            argsA.push(args[i]);
+            temp ="";
+            state = DSCRPT_DEFAULT;
+            break;
+            default:
+            if (state == DSCRPT_ARRAY){
+                temp += args[i];
+                argsA.push(temp);
+                temp  = "";
+                state = DSCRPT_DEFAULT;
+            }else{
+                argsA.push(args[i]);
+            }
+        }
+    }
+    return {args:argsA,ret:result};
 }
 
 /** @constructor */
@@ -45,7 +82,7 @@ var MethodInfo = function(dStream, constantPool){
     }
     this.invoke = function (local_var,xl){
 #ifdef DEBUG_INTRP
-        LOG("Calling " + this.name_ref.str + this.descriptor_ref.str)
+        LOG("Calling " + xl.className+ " " + this.name_ref.str + this.descriptor_ref.str)
 #endif
         local_var = local_var||[];
         var frame = { operand_stack: [], local_variables:local_var };
@@ -54,7 +91,7 @@ var MethodInfo = function(dStream, constantPool){
             if (attr.id == ATTR_CODE){
                 var result = interpret(frame,attr.code,this,xl);
 #ifdef DEBUG_INTRP
-        LOG("Returing from " + this.name_ref.str + this.descriptor_ref.str)
+        LOG("Returing from " + xl.className+ " " + this.name_ref.str + this.descriptor_ref.str)
 #endif
                 return result;
             }
diff --git a/src/internalJNI.jsh b/src/internalJNI.jsh
new file mode 100644
index 0000000..dda1ff3
--- /dev/null
+++ b/src/internalJNI.jsh
@@ -0,0 +1,16 @@
+/* -*- Mode: Javascript -*-
+ * -*- coding: UTF-8 -*-
+ * Copyright (C) 2011 by Artur Ventura
+ *
+ * File: types.js
+ * Time-stamp: Fri Jul 15 02:46:27 2011
+ *
+ * Author: Artur Ventura
+ *
+ */
+
+ {
+     'java.lang.System' : {
+         'method arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V' : java_lang_System_arraycopy
+     }
+ }
\ No newline at end of file
diff --git a/src/intrp.def b/src/intrp.def
index cb37e97..7b6a13c 100644
--- a/src/intrp.def
+++ b/src/intrp.def
@@ -73,6 +73,9 @@ ENDDEF
 
 DEFOP(ARRAYLENGTH)
     var arrayref = OPPOP();
+    if (!(arrayref.primitive == true || arrayref.primitive == false)){
+        PANIC("NOT AN ARRAY");
+    }
     OPPUSH(arrayref.length);
 ENDDEF
 
@@ -516,9 +519,10 @@ DEFOP(GETFIELD)
     var objectref = OPPOP();
     
     CHECK_NULL(objectref)
-    var field = objectref["class"].constantPool.get((indexbyte1 << 8) | indexbyte2);
+    var field = xl.constantPool.get((indexbyte1 << 8) | indexbyte2);
     //check if static
-    OPPUSH(objectref[canonicalName(field.class_ref.name_ref) + " " + field.name_and_type_ref.name_ref.str]);
+    OPPUSH(objectref[field.class_ref.name_ref.str + " " + field.name_and_type_ref.name_ref.str]);
+    LOG(field.class_ref.name_ref.str + " " + field.name_and_type_ref.name_ref.str);
 ENDDEF
 
 DEFOP(GETSTATIC)
@@ -538,7 +542,7 @@ DEFOP(GOTO)
     var branchbyte2 = READ_NEXT();
     
     var branchoffset = (branchbyte1 << 8) | branchbyte2;
-    PC = PC + branchoffset;
+    PC = PC + branchoffset - 3;
 ENDDEF
 
 DEFOP(GOTO_W)
@@ -548,7 +552,7 @@ DEFOP(GOTO_W)
     var branchbyte4 = READ_NEXT();
     
     var branchoffset = (branchbyte1 << 24) | (branchbyte2 << 16) | (branchbyte3 << 8) | branchbyte4;
-    PC = PC + branchoffset;
+    PC = PC + branchoffset - 5;
 ENDDEF
 
 DEFOP(I2B)
@@ -651,7 +655,7 @@ DEFOP(IF_ACMPEQ)
     var value2 = OPPOP();
     if (value1 == value2){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -662,7 +666,7 @@ DEFOP(IF_ACMPNE)
     var value2 = OPPOP();
     if (value1 != value2){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -673,7 +677,7 @@ DEFOP(IF_ICMPEQ)
     var value2 = OPPOP();
     if (value1 == value2){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -684,51 +688,51 @@ DEFOP(IF_ICMPNE)
     var value2 = OPPOP();
     if (value1 != value2){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
 DEFOP(IF_ICMPLT)
     var branchbyte1 = READ_NEXT();
     var branchbyte2 = READ_NEXT();
-    var value1 = OPPOP();
     var value2 = OPPOP();
+    var value1 = OPPOP();
     if (value1 < value2){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
 DEFOP(IF_ICMPLE)
     var branchbyte1 = READ_NEXT();
     var branchbyte2 = READ_NEXT();
-    var value1 = OPPOP();
     var value2 = OPPOP();
+    var value1 = OPPOP();
     if (value1 <= value2){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
 DEFOP(IF_ICMPGT)
     var branchbyte1 = READ_NEXT();
     var branchbyte2 = READ_NEXT();
-    var value1 = OPPOP();
     var value2 = OPPOP();
+    var value1 = OPPOP();
     if (value1 > value2){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
 DEFOP(IF_ICMPGE)
     var branchbyte1 = READ_NEXT();
     var branchbyte2 = READ_NEXT();
-    var value1 = OPPOP();
     var value2 = OPPOP();
+    var value1 = OPPOP();
     if (value1 >= value2){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -739,7 +743,7 @@ DEFOP(IFEQ)
 
     if (value == 0){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -750,7 +754,7 @@ DEFOP(IFNE)
 
     if (value != 0){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -761,7 +765,7 @@ DEFOP(IFLT)
 
     if (value < 0){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -772,7 +776,7 @@ DEFOP(IFLE)
 
     if (value <= 0){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -783,7 +787,7 @@ DEFOP(IFGT)
 
     if (value > 0){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -794,7 +798,7 @@ DEFOP(IFGE)
 
     if (value >= 0){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -805,7 +809,7 @@ DEFOP(IFNONNULL)
 
     if (value != NULL){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -816,7 +820,7 @@ DEFOP(IFNULL)
 
     if (value != NULL){
         var branchoffset = (branchbyte1 << 8) | branchbyte2;
-        PC = PC + branchoffset;
+        PC = PC + branchoffset - 3;
     }
 ENDDEF
 
@@ -836,7 +840,7 @@ DEFALIAS(ILOAD_1)
 DEFALIAS(ILOAD_2)
 DEFALIAS(ILOAD_3)
 DEFNOP()
-    OPPUSH(OPCODE - ILOAD_0);
+    OPPUSH(LOCAL_VAR(OPCODE - ILOAD_0));
 ENDDEF
 
 DEFOP(IMUL)
@@ -923,12 +927,31 @@ DEFOP(INVOKESTATIC)
    var indexbyte2 = READ_NEXT();
    var args = [];
 
-   var method = xl.constantPool.get((indexbyte1 << 8) | indexbyte2);
-   for(var i=0; i<method.descriptor.args.length; i++){
-       args.push(OPPOP());
+   var methodDesrc = xl.constantPool.get((indexbyte1 << 8) | indexbyte2);
+   var cl = xl.jvm.classForName(methodDesrc.class_ref.jvmClassName);
+   var methodId = "method " + methodDesrc.name_and_type_ref.name_ref.str +  methodDesrc.name_and_type_ref.descriptor_ref.str
+   var method = cl[methodId];
+   var args = OPSTACK_MULTIPOP(OPSTACK_LENGTH() - method.descriptor.args.length);
+   var result;
+   if(method.access_flags & ACC_NATIVE){
+       LOG("Calling " + xl.className+ " " + method.name_ref.str + method.descriptor_ref.str)
+       LOG("!! NATIVE !!")
+       if (methodId in xl.jvm.internalJNITable[canonicalName(cl.this_class.name_ref)]){
+
+           result = xl.jvm.internalJNITable[canonicalName(cl.this_class.name_ref)][methodId].apply(cl,args);
+           LOG("Returing from " + xl.className+ " " + method.name_ref.str + method.descriptor_ref.str)
+       }else if (methodId in xl.jvm.JNITable[canonicalName(cl.this_class.name_ref)][methodId]){
+           result = xl.jvm.JNITable[canonicalName(cl.this_class.name_ref)][methodId].apply(cl,args)
+       }else{
+           PANIC(methodId + " declared as native but not mapped");
+       }
+        LOG("Returing from " + xl.className+ " " + method.name_ref.str + method.descriptor_ref.str)
+   }else{
+       result = method.invoke(args,cl);
+   }
+   if (result != undefined){
+       OPPUSH(result.return_object);
    }
-   
-   PANIC("NOT IMPLEMENTED YET");
 ENDDEF
 
 DEFOP(INVOKEVIRTUAL)
@@ -940,7 +963,7 @@ DEFOP(INVOKEVIRTUAL)
    var cl = xl.jvm.classForName(methodDesrc.class_ref.jvmClassName);
    var methodId = "method " + methodDesrc.name_and_type_ref.name_ref.str +  methodDesrc.name_and_type_ref.descriptor_ref.str
    var method = cl[methodId];
-   var args = OPSTACK_MULTIPOP(OPSTACK_LENGTH() - method.descriptor.args.length);
+   var args = OPSTACK_MULTIPOP(OPSTACK_LENGTH() - method.descriptor.args.length - 1);
    var result;
    if(method.access_flags & ACC_NATIVE){
        PANIC("INVOKEVIRTUAL NATIVE CALL")
@@ -1017,10 +1040,10 @@ DEFNOP()
 ENDDEF
 
 DEFOP(ISUB)
-    var value1 = OPPOP();
     var value2 = OPPOP();
+    var value1 = OPPOP();
     var result = value1 - value2;
-    if (IS_UNDERFLOW(result,INT_MAX_VALUE)){
+    if (IS_UNDERFLOW(result,INT_MIN_VALUE)){
         OPPUSH(INT_OVERFLOW(result));
     }else{
         OPPUSH(result);
@@ -1417,9 +1440,9 @@ DEFOP(PUTFIELD)
     var objectref = OPPOP();
     
     CHECK_NULL(objectref)
-    var field = objectref["class"].constantPool.get((indexbyte1 << 8) | indexbyte2);
+    var field = xl.constantPool.get((indexbyte1 << 8) | indexbyte2);
     //check if static
-    objectref[canonicalName(field.class_ref.name_ref) + " " + field.name_and_type_ref.name_ref.str] = value;
+    objectref[field.class_ref.name_ref.str + " " + field.name_and_type_ref.name_ref.str] = value;
 ENDDEF
 
 DEFOP(GETSTATIC)
diff --git a/src/javaNativeInterface.js b/src/javaNativeInterface.js
new file mode 100644
index 0000000..6d11076
--- /dev/null
+++ b/src/javaNativeInterface.js
@@ -0,0 +1,18 @@
+/* -*- Mode: Javascript -*-
+ * -*- coding: UTF-8 -*-
+ * Copyright (C) 2011 by Artur Ventura
+ *
+ * File: javaNativeInterface.js
+ * Time-stamp: Fri Jul 15 02:46:27 2011
+ *
+ * Author: Artur Ventura
+ *
+ */
+ 
+//arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V
+function java_lang_System_arraycopy(src,srcPos,dest,destPos,length){
+    var temp = src.value.slice(srcPos,length);
+    for (var i = 0; i < temp.length; i++){
+        dest.value[destPos + i] = temp[i];
+    }
+}
\ No newline at end of file
diff --git a/src/nativeArrays.js b/src/nativeArrays.js
index 87dafe4..8d43f4b 100644
--- a/src/nativeArrays.js
+++ b/src/nativeArrays.js
@@ -10,7 +10,15 @@
  */
  
 #include "cpu.jsh"
- 
+
+String.prototype.toArray = function(){
+    var result =[];
+    for(i =0; i < this.length; i++){
+      result.push(this.charCodeAt(i));
+    }
+    return result;
+}
+
 function printNativeArray(){
     var result = "[";
     if(this.primitive){
@@ -49,4 +57,4 @@ function printNativeArray(){
 function make1DNativeArray(count,primitive,type){
     var inst = {toString: printNativeArray,length:count, dimensions:1, value:[], primitive:primitive, 'class':type};
     return inst;
-}
\ No newline at end of file
+}
diff --git a/webserver/index.html b/webserver/index.html
index 40c261d..981472b 100644
--- a/webserver/index.html
+++ b/webserver/index.html
@@ -2,9 +2,13 @@
   <head>
     <title>JS JVM</title>
     <script>
+		var lident = -1;
       write = function(msg){
       var l = document.getElementById("log");
       var match;
+		if (msg.match(/Calling/)){
+			lident++;
+		}
 		if ((match = msg.match(/(\d+): (\w+) (op:\[[^\]]*]) (.*)/))){
 			var space3 = "";
 			for(var i=0; i<3-(match[1].length); i++){space3 += " " }
@@ -16,7 +20,15 @@
 		}else{
 			msg=htmlentities(msg);
 		}
-      l.innerHTML = l.innerHTML + msg + "\n";
+		if (msg.match(/!! NATIVE !!/)){
+			msg = "<span style='color:green'>" + msg + "</span>"
+		}
+		var spac = ""
+		for (var i =0; i<lident; i++){ spac += "    ";}
+		if (msg.match(/Returing/)){
+			lident--;
+		}
+      l.innerHTML = l.innerHTML + spac + msg + "\n";
 
       }
     </script>