diff --git a/README.html b/README.html
index 12b224dd..344a6ab2 100644
--- a/README.html
+++ b/README.html
@@ -67,6 +67,7 @@ at improving on the 1.0 vm in the following aspects.
 <li>Improved class and package naming conventions. 
 <li>Improved unit tests of core classes. 
 <li>Improved quality due to major redesign and rewrite of core elements. 
+<li>Improved weak table support, including weak keys. 
 </ul>
 
 <h1>2 - <a name="2">Simple Examples</a></h1>
@@ -193,6 +194,31 @@ An ant script to build and run the midlet is in
 <p>
 You must install the wireless toolkit and define <em>WTK_HOME</em> for this script to work. 
 
+<h2>Run a script using JSR-233 Dynamic Scripting</h2>
+
+<p>
+The standard use of JSR-233 scripting engines may be used:
+
+<pre>
+	ScriptEngineManager mgr = new ScriptEngineManager();
+	ScriptEngine e = mgr.getEngineByExtension(".lua");
+	e.put("x", 25);
+	e.eval("y = math.sqrt(x)");
+	System.out.println( "y="+e.get("y") );
+</pre>
+
+<p>
+All standard aspects of script engines including compiled statements should be supported.
+
+<p>
+You must include the library <b>lib/luaj-jse-2.0.jar</b> in your class path.
+
+<p>
+A working example may be found in
+<pre>
+	examples/jse/ScriptEngineSample.java
+</pre>
+
 <h2>Excluding the lua bytecode compiler</h2>
 
 By default, the compiler is included whenever <em>standardGlobals()</em> or <em>debugGlobals()</em> are called.  
@@ -239,31 +265,6 @@ lua source or lua binary files.
 <p>
 The <em>bcel</em> library must be on the class path for this to work.
 
-<h2>Run a script using JSR-233 Dynamic Scripting</h2>
-
-<p>
-The standard use of JSR-233 scripting engines may be used:
-
-<pre>
-	ScriptEngineManager mgr = new ScriptEngineManager();
-	ScriptEngine e = mgr.getEngineByExtension(".lua");
-	e.put("x", 25);
-	e.eval("y = math.sqrt(x)");
-	System.out.println( "y="+e.get("y") );
-</pre>
-
-<p>
-All standard aspects of script engines including compiled statements should be supported.
-
-<p>
-You must include the library <b>lib/luaj-jse-2.0.jar</b> in your class path.
-
-<p>
-A working example may be found in
-<pre>
-	examples/jse/ScriptEngineSample.java
-</pre>
-
 <h1>3 - <a name="3">Concepts</a></h1>
 
 <h2>Globals</h2>
@@ -446,9 +447,7 @@ and LuaForge:
 <h2>Main Changes by Version</h2>
 <table cellspacing="10"><tr><td><table cellspacing="4">
 <tr valign="top"><td>&nbsp;&nbsp;<b>2.0</b></td><td><ul>
-<li>Core vm and core libraries completed.  
-<li>lua2java source-to-source compiler produces working files for all unit tests.
-<li>luajc bytecode-to-bytecode compiler produces working files for all unit tests.  
+<li>Initial release of 2.0 version  
 </ul></td></tr>
 </table>
 
@@ -456,8 +455,9 @@ and LuaForge:
 <ul>
 <li>debug code may not be completely removed by some obfuscators
 <li>tail calls are not tracked in debug information
-<li>using both version 1 and 2 libraries together in the same java vm has not been tested.
+<li>using both version 1 and 2 libraries together in the same java vm has not been tested
 <li>module() and setfenv() only partially supported for lau2java or luajc compiled lua
-<li>luajc may infer incorrect upvalue boundaries
+<li>luajc can produce invalid class files in some cases
+<li>values associated with weak keys may linger longer than expected
 </ul>
 
diff --git a/src/jse/org/luaj/vm2/luajc/JavaBuilder.java b/src/jse/org/luaj/vm2/luajc/JavaBuilder.java
index 35f490af..01afa650 100644
--- a/src/jse/org/luaj/vm2/luajc/JavaBuilder.java
+++ b/src/jse/org/luaj/vm2/luajc/JavaBuilder.java
@@ -729,6 +729,6 @@ public class JavaBuilder {
 
 	public void appendBuffer() {
         append(factory.createInvoke(STR_LUAVALUE, "checkstring", TYPE_LUASTRING, Type.NO_ARGS, Constants.INVOKEVIRTUAL));
-        append(factory.createInvoke(STR_BUFFER, "append", Type.VOID, new Type[] { TYPE_LUASTRING }, Constants.INVOKEVIRTUAL));
+        append(factory.createInvoke(STR_BUFFER, "append", TYPE_BUFFER, new Type[] { TYPE_LUASTRING }, Constants.INVOKEVIRTUAL));
 	}
 }
diff --git a/src/jse/org/luaj/vm2/luajc/JavaGen.java b/src/jse/org/luaj/vm2/luajc/JavaGen.java
index b4f134de..93f7d5dc 100644
--- a/src/jse/org/luaj/vm2/luajc/JavaGen.java
+++ b/src/jse/org/luaj/vm2/luajc/JavaGen.java
@@ -161,7 +161,6 @@ public class JavaGen {
 			case Lua.OP_CONCAT: /*	A B C	R(A):= R(B).. ... ..R(C)			*/
 				builder.newBuffer();
 				while ( b<=c ) {
-					builder.dup();
 					builder.loadLocal(pc, b++);
 					builder.appendBuffer();
 				}
diff --git a/test/junit/org/luaj/vm2/CompatibiltyTest.java b/test/junit/org/luaj/vm2/CompatibiltyTest.java
index 46949145..1a87ecff 100644
--- a/test/junit/org/luaj/vm2/CompatibiltyTest.java
+++ b/test/junit/org/luaj/vm2/CompatibiltyTest.java
@@ -63,8 +63,8 @@ public class CompatibiltyTest {
 		TestSuite suite = new TestSuite("Compatibility Tests");
 		suite.addTest( new TestSuite( JseCompatibilityTest.class,   "JSE Tests" ) );
 		suite.addTest( new TestSuite( JmeCompatibilityTest.class,   "JME Tests" ) );
-		suite.addTest( new TestSuite( Lua2JavaTest.class,   "Lua2Java Tests" ) );
 		suite.addTest( new TestSuite( JseBytecodeTest.class,        "JSE Bytecode Tests" ) );
+		suite.addTest( new TestSuite( Lua2JavaTest.class,   		"Lua2Java Tests" ) );
 		return suite;
 	}