This table captures the history of the JAXB RI integration into JDK.

This is for information purposes only. In particular, the JAXB RI in JDK is

package renamed to avoid any conflict with the stand-alone JAXB RI  distribution

or with the jaxb2- reflection library.  You can use any version of these with any version of

JDK without worrying about implementation conflicts. JDK6 first release - JDK6 u3    JAXB RI 2.0.3 JDK6 u4                                 JAXB RI 2.1.3 JDK6 u14                                JAXB RI 2.1.10 JDK7 first release                    JAXB RI 2.2.4-1比如com.sun.xml.internal.bind.v2.ContextFactory就是com.sun.xml.bind.v2.ContextFactory package renamed.

那么他们的加载顺序是什么样的呢？

The algorithm used to locate the provider subclass to use consists of the following steps:

•   If the $java.home/lib /jaxb.properties file exists and it is readable by   the java.util.Properties.load(InputStream) method and it contains   an entry whose key is javax.xml.bind.context.factory then the value of   that entry is used as the name of the implementation class.

•   If a system property with the name javax.xml.bind.context.factory   is defined, then its value is used as the name of the implementation class.

•   If a resource with the name of   META-INF/services/javax.xml.bind.context.factory   exists, then its first line, if present, is used as the UTF-8 encoded   name of the implementation class.

•   Finally, a default implementation class name is used.

后来发现JWS-RI的加载顺序与这个1,3倒过来了，我没有去确认。链接给大家：

http://docs.oracle.com/javaee/5/api/javax/xml/ws/spi/Provider.html，需要的自已确认吧。