diff --git a/src/core/org/luaj/vm2/compiler/FuncState.java b/src/core/org/luaj/vm2/compiler/FuncState.java
index 70e0f885..98534d50 100644
--- a/src/core/org/luaj/vm2/compiler/FuncState.java
+++ b/src/core/org/luaj/vm2/compiler/FuncState.java
@@ -479,7 +479,7 @@ public class FuncState extends Constants {
 			return ((Integer) h.get(v)).intValue();
 		}
 		final int idx = this.nk;
-		this.h.put(v, new Integer(idx));
+		this.h.put(v, Integer.valueOf(idx));
 		final Prototype f = this.f;
 		if (f.k == null || nk + 1 >= f.k.length)
 			f.k = realloc( f.k, nk*2 + 1 );
diff --git a/src/core/org/luaj/vm2/compiler/LexState.java b/src/core/org/luaj/vm2/compiler/LexState.java
index 0192de05..c3a64b16 100644
--- a/src/core/org/luaj/vm2/compiler/LexState.java
+++ b/src/core/org/luaj/vm2/compiler/LexState.java
@@ -170,7 +170,7 @@ public class LexState extends Constants {
 	static {
 		for ( int i=0; i<NUM_RESERVED; i++ ) {
 			LuaString ts = (LuaString) LuaValue.valueOf( luaX_tokens[i] );
-			RESERVED.put(ts, new Integer(FIRST_RESERVED+i));
+			RESERVED.put(ts, Integer.valueOf(FIRST_RESERVED+i));
 		}
 	}
 
diff --git a/src/jse/org/luaj/vm2/lib/jse/CoerceLuaToJava.java b/src/jse/org/luaj/vm2/lib/jse/CoerceLuaToJava.java
index c658aacc..cac1ac48 100644
--- a/src/jse/org/luaj/vm2/lib/jse/CoerceLuaToJava.java
+++ b/src/jse/org/luaj/vm2/lib/jse/CoerceLuaToJava.java
@@ -174,13 +174,13 @@ public class CoerceLuaToJava {
 
 		public Object coerce(LuaValue value) {
 			switch ( targetType ) {
-			case TARGET_TYPE_BYTE: return new Byte( (byte) value.toint() );
-			case TARGET_TYPE_CHAR: return new Character( (char) value.toint() );
-			case TARGET_TYPE_SHORT: return new Short( (short) value.toint() );
-			case TARGET_TYPE_INT: return new Integer( (int) value.toint() );
-			case TARGET_TYPE_LONG: return new Long( (long) value.todouble() );
-			case TARGET_TYPE_FLOAT: return new Float( (float) value.todouble() );
-			case TARGET_TYPE_DOUBLE: return new Double( (double) value.todouble() );
+			case TARGET_TYPE_BYTE: return Byte.valueOf( (byte) value.toint() );
+			case TARGET_TYPE_CHAR: return Character.valueOf( (char) value.toint() );
+			case TARGET_TYPE_SHORT: return Short.valueOf( (short) value.toint() );
+			case TARGET_TYPE_INT: return Integer.valueOf( (int) value.toint() );
+			case TARGET_TYPE_LONG: return Long.valueOf( (long) value.todouble() );
+			case TARGET_TYPE_FLOAT: return Float.valueOf( (float) value.todouble() );
+			case TARGET_TYPE_DOUBLE: return Double.valueOf( (double) value.todouble() );
 			default: return null;
 			}
 		}
@@ -308,7 +308,7 @@ public class CoerceLuaToJava {
 		public Object coerce(LuaValue value) {
 			switch ( value.type() ) {
 			case LuaValue.TNUMBER:
-				return value.isint()? (Object)new Integer(value.toint()): (Object)new Double(value.todouble());
+				return value.isint()? (Object) Integer.valueOf(value.toint()): (Object) Double.valueOf(value.todouble());
 			case LuaValue.TBOOLEAN:
 				return value.toboolean()? Boolean.TRUE: Boolean.FALSE;
 			case LuaValue.TSTRING:
diff --git a/src/jse/org/luaj/vm2/script/LuaScriptEngine.java b/src/jse/org/luaj/vm2/script/LuaScriptEngine.java
index 415c885c..05282641 100644
--- a/src/jse/org/luaj/vm2/script/LuaScriptEngine.java
+++ b/src/jse/org/luaj/vm2/script/LuaScriptEngine.java
@@ -244,8 +244,8 @@ public class LuaScriptEngine extends AbstractScriptEngine implements ScriptEngin
 		case LuaValue.TSTRING: return luajValue.tojstring();
 		case LuaValue.TUSERDATA: return luajValue.checkuserdata(Object.class);
 		case LuaValue.TNUMBER: return luajValue.isinttype()? 
-				(Object) new Integer(luajValue.toint()): 
-				(Object) new Double(luajValue.todouble());
+				(Object) Integer.valueOf(luajValue.toint()): 
+				(Object) Double.valueOf(luajValue.todouble());
 		default: return luajValue;
 		}
 	}