diff --git a/compiler/obc/java/java.ml b/compiler/obc/java/java.ml
index f76c343..60d6fb4 100644
--- a/compiler/obc/java/java.ml
+++ b/compiler/obc/java/java.ml
@@ -9,7 +9,8 @@
 
 type class_name = Names.qualname (** [qual] is the package name, [Name] is the class name *)
 type obj_ident = Idents.var_ident
-type constructor_name = Names.qualname (** [Qual] is the enum class name (type), [NAME] is the constructor name *)
+(** [Qual] is the enum class name (type), [NAME] is the constructor name *)
+type constructor_name = Names.qualname
 type const_name = Names.qualname
 type method_name = Names.name
 type field_name = Names.name
@@ -115,7 +116,8 @@ let rec default_value ty = match ty with
 
 
 let java_pervasive_class c = Names.qualname_of_string ("jeptagon.Pervasives."^c)
-let the_java_pervasives = Names.qualname_of_string "jeptagon.Pervasives"
+let java_pervasives_name = Names.qualname_of_string "jeptagon.Pervasives"
+let java_pervasives = Eclass java_pervasives_name
 
 
 let mk_var x = Evar x
@@ -135,18 +137,21 @@ let mk_methode ?(protection=Ppublic) ?(static=false) ?(args=[]) ?(returns=Tunit)
 let mk_classe ?(imports=[]) ?(protection=Ppublic) ?(static=false) ?(fields=[])
               ?(classes=[]) ?(constrs=[]) ?(methodes=[]) ?(implements=[])
               class_name =
-  { c_protection = protection; c_static = static; c_name = class_name; c_imports = imports; c_implements = implements;
-    c_kind = Cgeneric { cd_fields = fields; cd_classs = classes; cd_constructors = constrs; cd_methodes = methodes; } }
+  { c_protection = protection; c_static = static; c_name = class_name;
+    c_imports = imports; c_implements = implements;
+    c_kind = Cgeneric { cd_fields = fields; cd_classs = classes;
+                        cd_constructors = constrs; cd_methodes = methodes; } }
 
 let mk_enum ?(protection=Ppublic) ?(static=false) ?(imports=[]) ?(implements=[])
             constructor_names class_name =
-  { c_protection = protection; c_static = static; c_name = class_name; c_imports = imports; c_implements = implements;
+  { c_protection = protection; c_static = static; c_name = class_name;
+    c_imports = imports; c_implements = implements;
     c_kind = Cenum(constructor_names) }
 
 
-let mk_field ?(protection = Ppublic) ?(static = false) ?(final = false) ?(value = None)
-             ty ident =
-  { f_protection = protection; f_static = static; f_final = final; f_type = ty; f_ident = ident; f_value = value }
+let mk_field ?(protection = Ppublic) ?(static = false) ?(final = false) ?(value = None) ty ident =
+  { f_protection = protection; f_static = static; f_final = final;
+    f_type = ty; f_ident = ident; f_value = value }
 
 let vds_to_exps vd_l = List.map (fun { vd_ident = x } -> mk_var x) vd_l
 
diff --git a/compiler/obc/java/java_main.ml b/compiler/obc/java/java_main.ml
index 947a90d..bc3f4e5 100644
--- a/compiler/obc/java/java_main.ml
+++ b/compiler/obc/java/java_main.ml
@@ -5,6 +5,11 @@ open Signature
 open Java
 open Java_printer
 
+let load_conf () =
+  (*TODO spill normalize_mem := false ! *)
+  Compiler_options.do_scalarize := true;
+  ()
+
 (** returns the vd and the pat of a fresh ident from [name] *)
 let mk_var ty name =
   let id = Idents.gen_var "java_main" name in
@@ -61,7 +66,6 @@ let program p =
         in
         let acts =
           let out = Eclass(Names.qualname_of_string "java.lang.System.out") in
-          let jarrays = Eclass(Names.qualname_of_string "java.util.Arrays") in
           let jint = Eclass(Names.qualname_of_string "Integer") in
           let jfloat = Eclass(Names.qualname_of_string "Float") in
           let jbool = Eclass(Names.qualname_of_string "Boolean") in
@@ -100,15 +104,7 @@ let program p =
             | Tunit -> Aexp(Emethod_call(e_main, "step", []))
             | _ -> Anewvar (vd_ret, Emethod_call(e_main, "step", []))
           in
-          let print_ret = match ty_ret with
-            | Tunit -> Sstring ""
-            | Tarray (Tarray _, _) -> Emethod_call(jarrays, "deepToString", [exp_ret])
-            | Tarray _ -> Emethod_call(jarrays, "toString", [exp_ret])
-            | Tint -> Emethod_call(jint, "toString", [exp_ret])
-            | Tfloat -> Emethod_call(jfloat, "toString", [exp_ret])
-            | Tbool -> Emethod_call(jbool, "toString", [exp_ret])
-            | _ -> Emethod_call(exp_ret, "toString", [])
-          in
+          let print_ret = Emethod_call(java_pervasives, "genToString", [exp_ret]) in
           let main_for_loop i =
             [call_main; Aexp (Emethod_call(out, "printf",
                                 [Sstring "%d => %s\\n"; Evar i; print_ret]))]
diff --git a/lib/java/jeptagon/Pervasives.java b/lib/java/jeptagon/Pervasives.java
index 35570fe..d8a6dc4 100644
--- a/lib/java/jeptagon/Pervasives.java
+++ b/lib/java/jeptagon/Pervasives.java
@@ -1,5 +1,7 @@
 package jeptagon;
 
+import java.lang.reflect.Array;
+import java.util.Arrays;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Future;
@@ -8,8 +10,14 @@ import java.util.concurrent.TimeUnit;
 public class Pervasives {
 
 	public static int between(int i, int m) {
-		if (i<0) return 0;
-		else if (i>=m) return m-1;
+		if (i<0) {
+			java.lang.System.err.printf("%d ! >= 0\n",i);
+			return 0;
+		}
+		else if (i>=m) {
+			java.lang.System.err.printf("%d ! < %d\n",i,m);
+			return m-1;
+		}
 		else return i;
 	}
 
@@ -31,11 +39,50 @@ public class Pervasives {
 		public V get(long timeout, TimeUnit unit) { return v; }
 	}
 
+	//faster version for primitive arrays using serializing
+    public static Object copyNd(Object arr) {
+        if (arr.getClass().isArray()) {
+            int innerArrayLength = Array.getLength(arr);
+            Class component = arr.getClass().getComponentType();
+            Object newInnerArray = Array.newInstance(component, innerArrayLength);
+            //copy each elem of the array
+            for (int i = 0; i < innerArrayLength; i++) {
+                Object elem = copyNd(Array.get(arr, i));
+                Array.set(newInnerArray, i, elem);
+            }
+            return newInnerArray;
+        } else {
+            return arr;//cant deep copy an opac object??
+        }
+    }
+
+	public static String genToString(Object c) {
+		Class<?> cClass = c.getClass();
+		if (cClass.isArray()) {
+			switch (cClass.getName().charAt(1)) { //charAt(0) is '['
+			case 'B' : return Arrays.toString((byte[]) c);
+			case 'C' : return Arrays.toString((char[]) c);
+			case 'D' : return Arrays.toString((double[]) c);
+			case 'F' : return Arrays.toString((float[]) c);
+			case 'I' : return Arrays.toString((int[]) c);
+			case 'J' : return Arrays.toString((long[]) c);
+			case 'S' : return Arrays.toString((short[]) c);
+			case 'Z' : return Arrays.toString((boolean[]) c);
+			default : //L or [
+				return Arrays.deepToString((Object [])c);
+			}
+		} else
+		return c.toString();
+	}
+
 	public static class Tuple1 {
 		public final Object c0;
 		public Tuple1(Object v) {
 			c0 = v;
 		}
+		public String toString() {
+			return "(" + genToString(c0) + ")";
+		}
 	}
 
 	public static class Tuple2 {
@@ -46,7 +93,7 @@ public class Pervasives {
 			c1 = v1;
 		}
 		public String toString() {
-			return "(" + c0.toString() + ", " + c1.toString() + ")";
+			return "(" + genToString(c0) + ", " + genToString(c1) + ")";
 		}
 	}
 
@@ -60,7 +107,7 @@ public class Pervasives {
 			c2 = v2;
 		}
 		public String toString() {
-			return "(" + c0.toString() + ", " + c1.toString() + ", " + c2.toString() + ")";
+			return "(" + genToString(c0) + ", " + genToString(c1) + ", " + genToString(c2) + ")";
 		}
 	}
 
@@ -76,8 +123,8 @@ public class Pervasives {
 			c3 = v3;
 		}
 		public String toString() {
-			return "(" + c0.toString() + ", " + c1.toString()
-			+ ", " + c2.toString() + ", " + c3.toString() + ")";
+			return "(" + genToString(c0) + ", " + genToString(c1)
+			+ ", " + genToString(c2) + ", " + genToString(c3) + ")";
 		}
 	}
 
@@ -95,8 +142,8 @@ public class Pervasives {
 			c4 = v4;
 		}
 		public String toString() {
-			return "(" + c0.toString() + ", " + c1.toString() + ", " + c2.toString()
-			+ ", " + c3.toString() + ", " + c4.toString() + ")";
+			return "(" + genToString(c0) + ", " + genToString(c1) + ", " + genToString(c2)
+			+ ", " + genToString(c3) + ", " + genToString(c4) + ")";
 		}
 	}
 
@@ -116,8 +163,8 @@ public class Pervasives {
 			c5 = v5;
 		}
 		public String toString() {
-			return "(" + c0.toString() + ", " + c1.toString() + ", " + c2.toString()
-			+ ", " + c3.toString() + ", " + c4.toString() + ", " + c5.toString() + ")";
+			return "(" + genToString(c0) + ", " + genToString(c1) + ", " + genToString(c2)
+			+ ", " + genToString(c3) + ", " + genToString(c4) + ", " + genToString(c5) + ")";
 		}
 	}
 
@@ -139,9 +186,63 @@ public class Pervasives {
 			c6 = v6;
 		}
 		public String toString() {
-			return "(" + c0.toString() + ", " + c1.toString() + ", " + c2.toString()
-			+ ", " + c3.toString() + ", " + c4.toString() + ", " + c5.toString()
-			+ ", " + c6.toString() + ")";
+			return "(" + genToString(c0) + ", " + genToString(c1) + ", " + genToString(c2)
+			+ ", " + genToString(c3) + ", " + genToString(c4) + ", " + genToString(c5)
+			+ ", " + genToString(c6) + ")";
+		}
+	}
+
+	public static class Tuple8 {
+		public final Object c0;
+		public final Object c1;
+		public final Object c2;
+		public final Object c3;
+		public final Object c4;
+		public final Object c5;
+		public final Object c6;
+		public final Object c7;
+		public Tuple8(Object v0, Object v1, Object v2, Object v3, Object v4, Object v5, Object v6, Object v7) {
+			c0 = v0;
+			c1 = v1;
+			c2 = v2;
+			c3 = v3;
+			c4 = v4;
+			c5 = v5;
+			c6 = v6;
+			c7 = v7;
+		}
+		public String toString() {
+			return "(" + genToString(c0) + ", " + genToString(c1) + ", " + genToString(c2)
+			+ ", " + genToString(c3) + ", " + genToString(c4) + ", " + genToString(c5)
+			+ ", " + genToString(c6) + ", " + genToString(c7) + ")";
+		}
+	}
+
+	public static class Tuple9 {
+		public final Object c0;
+		public final Object c1;
+		public final Object c2;
+		public final Object c3;
+		public final Object c4;
+		public final Object c5;
+		public final Object c6;
+		public final Object c7;
+		public final Object c8;
+		public Tuple9(Object v0, Object v1, Object v2, Object v3, Object v4, Object v5, Object v6, Object v7, Object v8) {
+			c0 = v0;
+			c1 = v1;
+			c2 = v2;
+			c3 = v3;
+			c4 = v4;
+			c5 = v5;
+			c6 = v6;
+			c7 = v7;
+			c8 = v8;
+		}
+		public String toString() {
+			return "(" + genToString(c0) + ", " + genToString(c1) + ", " + genToString(c2)
+			+ ", " + genToString(c3) + ", " + genToString(c4) + ", " + genToString(c5)
+			+ ", " + genToString(c6) + ", " + genToString(c7) + ", " + genToString(c8) + ")";
 		}
 	}
 
@@ -155,5 +256,4 @@ public class Pervasives {
 		return x;
 	}
 
-
 }