Marshalling third party classes with JAXB

I put together a test case similar to what is illustrated at:
[https://jaxb.dev.java.net/guide/XML_layout_and_in_memory_data_layout.html#Using_XmlJavaTypeAdapter_for_element_attribute_values]
and here:
[http://weblogs.java.net/blog/kohsuke/archive/2005/09/using_jaxb_20s.html]
I declared a Color object, defined a ColorAdapter, and declared the @XmlJavaTypeAdapter to the package. Alas, it isn't getting called... If you consider the following sample code:
JAXBContext jc = JAXBContext.newInstance(Color.class);
// Note that a dump of the context confirms that com.acme.Color is listed!
//System.out.println("JAXBContext: " + jc.toString());
Marshaller m = jc.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
Color color = Color.RED;
// Case 1: The following line works, but it does NOT call the ColorAdapter...
m.marshal( new JAXBElement( new QName("", "rootTag"), Color.class, color ), System.out);
// Case 2: This fails...
m.marshal(color, System.out);Case 1 "works" (doesn't error), but the output clearly shows that the ColorAdapter is not getting called.
Case 2 throws a javax.xml.bind.MarshalException exception:
javax.xml.bind.MarshalException
- with linked exception:
[com.sun.istack.SAXException2: unable to marshal type "com.acme.Color" as an element because it is missing an @XmlRootElement annotation]
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:
328)
testMarshalling : javax.xml.bind.MarshalException
at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.jav
a:254)
at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshal
lerImpl.java:75)
at resty.AppTest.testMarshalling(AppTest.java:68)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
- with linked exception:
[com.sun.istack.SAXException2: unable to marshal type "com.acme.Color" as an element because it is missing an @XmlRootElement annotation]
at java.lang.reflect.Method.invoke(Method.java:597)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.maven.surefire.junit.JUnitTestSet.execute(JUnitTestSet.java:213)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:338)
at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:997)
Caused by: com.sun.istack.SAXException2: unable to marshal type "com.acme.Color"
as an element because it is missing an @XmlRootElement annotation
at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:244)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:303)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:490)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:325)
... 29 moreNote that my Color object represents a third-party class -- a class where I can't just annotate it with @XmlRootElement. Hence, why I am looking at @XmlJavaTypeAdapter.
Can somebody please tell me why my adapter is not getting called, and what I can do about customizing the marshaling of a third-party class?
Note that I am using JAXB 2.1.8.

what kind of third party API are using ?

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