diff --git a/runtime/bicavm/browser/Window.class b/runtime/bicavm/browser/Window.class
new file mode 100644
index 0000000..158f79c
Binary files /dev/null and b/runtime/bicavm/browser/Window.class differ
diff --git a/runtime/bicavm/browser/Window.java b/runtime/bicavm/browser/Window.java
new file mode 100644
index 0000000..2e807e7
--- /dev/null
+++ b/runtime/bicavm/browser/Window.java
@@ -0,0 +1,5 @@
+package bicavm.browser;
+
+public class Window{
+	public static native void setTitle(String title);
+}
\ No newline at end of file
diff --git a/runtime/foo.class b/runtime/foo.class
index c396eee..9a86a91 100644
Binary files a/runtime/foo.class and b/runtime/foo.class differ
diff --git a/runtime/foo.java b/runtime/foo.java
index 1473dc3..396ee37 100644
--- a/runtime/foo.java
+++ b/runtime/foo.java
@@ -4,7 +4,7 @@ import bicavm.browser.Window;
 public class foo{
     public static void main(String[] args){
         String hello = "bicavm";
-        String world = "changed this title";
+        String world = " changed this title";
         Window.setTitle(hello + world);
     }
 }
\ No newline at end of file
diff --git a/src/intrp.def b/src/intrp.def
index b43ac60..499ff71 100644
--- a/src/intrp.def
+++ b/src/intrp.def
@@ -940,9 +940,9 @@ DEFOP(INVOKESTATIC)
        LOG("Calling " + className + " " + method.name_ref.str + method.descriptor_ref.str)
        LOG("!! NATIVE !!")
        if (xl.jvm.internalJNITable[className] && methodId in xl.jvm.internalJNITable[className]){
-           result = xl.jvm.internalJNITable[className][methodId].apply(cl,args);
+           result = {return_object: xl.jvm.internalJNITable[className][methodId].apply(cl,args)};
        }else if (xl.jvm.JNITable[className] && methodId in xl.jvm.JNITable[className]){
-           result = xl.jvm.JNITable[className][methodId].apply(cl,args)
+           result = {return_object: xl.jvm.JNITable[className][methodId].apply(cl,args)};s
        }else{
            PANIC(methodId + " declared as native but not mapped");
        }
@@ -950,8 +950,8 @@ DEFOP(INVOKESTATIC)
    }else{
        result = method.invoke(args,cl);
    }
-   if (result != undefined){
-       OPPUSH(result);
+   if (result != undefined && result.return_object!= undefined){
+       OPPUSH(result.return_object);
    }
 ENDDEF
 
diff --git a/src/javaNativeInterface.js b/src/javaNativeInterface.js
index ae759a7..3fd026b 100644
--- a/src/javaNativeInterface.js
+++ b/src/javaNativeInterface.js
@@ -51,7 +51,6 @@ function java_lang_Double_doubleToRawLongBits(d){
 	return new math.Long(y[0],y[1]);
 }
 
-function bicavm_browser_Window_setLocation(s){
+function bicavm_browser_Window_setTitle(s){
 	window.document.title = javaString2JS(s);
 }
-