diff -r e126d8eca69b -r b0c2840e2513 src/share/jaxws_classes/com/sun/xml/internal/bind/v2/model/impl/RuntimeBuiltinLeafInfoImpl.java
--- a/src/share/jaxws_classes/com/sun/xml/internal/bind/v2/model/impl/RuntimeBuiltinLeafInfoImpl.java	Thu Oct 31 12:36:20 2013 -0700
+++ b/src/share/jaxws_classes/com/sun/xml/internal/bind/v2/model/impl/RuntimeBuiltinLeafInfoImpl.java	Fri Nov 22 21:11:19 2013 +0100
@@ -91,9 +91,6 @@
 import com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext;
 import com.sun.xml.internal.bind.v2.util.ByteArrayOutputStreamEx;
 import com.sun.xml.internal.bind.v2.util.DataSourceSource;
-import java.util.logging.Logger;
-import com.sun.xml.internal.bind.Util;
-import java.util.logging.Level;
 
 import org.xml.sax.SAXException;
 
@@ -108,8 +105,6 @@
 public abstract class RuntimeBuiltinLeafInfoImpl<T> extends BuiltinLeafInfoImpl<Type,Class>
     implements RuntimeBuiltinLeafInfo, Transducer<T> {
 
-    private static final Logger logger = Util.getClassLogger();
-
     private RuntimeBuiltinLeafInfoImpl(Class type, QName... typeNames) {
         super(type, typeNames);
         LEAVES.put(type,this);
@@ -201,7 +196,6 @@
     public static final List<RuntimeBuiltinLeafInfoImpl<?>> builtinBeanInfos;
 
     public static final String MAP_ANYURI_TO_URI = "mapAnyUriToUri";
-    public static final String USE_OLD_GMONTH_MAPPING = "jaxb.ri.useOldGmonthMapping";
 
     static {
 
@@ -966,14 +960,7 @@
         m.put(DatatypeConstants.DATETIME,   "%Y-%M-%DT%h:%m:%s"+ "%z");
         m.put(DatatypeConstants.DATE,       "%Y-%M-%D" +"%z");
         m.put(DatatypeConstants.TIME,       "%h:%m:%s"+ "%z");
-        if (System.getProperty(USE_OLD_GMONTH_MAPPING) == null) {
-            m.put(DatatypeConstants.GMONTH, "--%M%z");      //  E2-12 Error. http://www.w3.org/2001/05/xmlschema-errata#e2-12
-        } else {                                            //  backw. compatibility
-            if (logger.isLoggable(Level.FINE)) {
-                logger.log(Level.FINE, "Old GMonth mapping used.");
-            }
-            m.put(DatatypeConstants.GMONTH, "--%M--%z");
-        }
+        m.put(DatatypeConstants.GMONTH,     "--%M--%z");
         m.put(DatatypeConstants.GDAY,       "---%D" + "%z");
         m.put(DatatypeConstants.GYEAR,      "%Y" + "%z");
         m.put(DatatypeConstants.GYEARMONTH, "%Y-%M" + "%z");