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The method <code>getAllAnnotationsOfPackage()</code> does the trick. It gets all annotations for a given <code>AnnotatedElement</code> (such as <code>Class</code>, <code>Method</code> and <code>Field</code>) that belong to the <code>annotationsPackage</code> package: <pre><code>public static List<Annotation> getAllAnnotationsOfPackage(AnnotatedElement annotatedElement, String annotationsPackage) { Annotation[] as = annotatedElement.getAnnotations(); List<Annotation> asList = new LinkedList<Annotation>(); for (int i = 0; i < as.length; i++) { if (as[i].annotationType().getPackage().getName() .startsWith(annotationsPackage)) { asList.add(as[i]); } } return asList; } </code></pre> Here's a working code (paste it on a GetAnnotationsOfPackage.java file) that goes through all methods and fields of a given class and gets all annotations of the given package: <pre><code>import java.lang.annotation.Annotation; import java.lang.reflect.*; import java.util.*; import javax.xml.bind.annotation.*; public class GetAnnotationsOfPackage { @XmlRootElement(name="RootElement") @XmlAccessorType(XmlAccessType.FIELD) public class Root { @XmlElement(name="SubElement") public String subElement; } public static void main(String[] args) { List<Annotation> as = getAnnotationsOfPackage(Root.class, "javax.xml.bind.annotation"); for (Annotation annotation : as) { System.out.println(annotation.annotationType().getName()); } } public static List<Annotation> getAnnotationsOfPackage(Class<?> classToCheck, String annotationsPackage) { List<Annotation> annotationsList = getAllAnnotationsOfPackage(classToCheck, annotationsPackage); Method[] ms = classToCheck.getDeclaredMethods(); for (int i = 0; i < ms.length; i++) { annotationsList.addAll(getAllAnnotationsOfPackage(ms[i], annotationsPackage)); } Field[] fs = classToCheck.getDeclaredFields(); for (int i = 0; i < fs.length; i++) { annotationsList.addAll(getAllAnnotationsOfPackage(fs[i], annotationsPackage)); } return annotationsList; } public static List<Annotation> getAllAnnotationsOfPackage(AnnotatedElement annotatedElement, String annotationsPackage) { Annotation[] as = annotatedElement.getAnnotations(); List<Annotation> asList = new LinkedList<Annotation>(); for (int i = 0; i < as.length; i++) { if (as[i].annotationType().getPackage().getName().startsWith(annotationsPackage)) { asList.add(as[i]); } } return asList; } } </code></pre> The <code>main()</code> method is getting all annotations from <code>"javax.xml.bind.annotation"</code> of the <code>Root</code> class and printing their names. Here's the output: <pre class="lang-none prettyprint-override"><code>javax.xml.bind.annotation.XmlRootElement javax.xml.bind.annotation.XmlAccessorType javax.xml.bind.annotation.XmlElement </code></pre>
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1. POJAXB: Generate list of annotations on class
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1. COThe number of classes to scan is relatively small so this is an acceptable approach. It still seems odd that though JAXB is doing this very thing somewhere, it does not expose it to library users.
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2. COThis is too raw (what class is annotated with what) for the JAXB spec to provide. If there was something near this, would be something more abstract like "get the list of `XmlRootElement`s: `jaxbContext.getXmlRootElements()`". The closest to that we have today is [JAXBContext#createJAXBIntrospector()](http://docs.oracle.com/javase/6/docs/api/javax/xml/bind/JAXBContext.html#createJAXBIntrospector()), but the [JAXBIntrospector](http://docs.oracle.com/javase/6/docs/api/javax/xml/bind/JAXBIntrospector.html) utility is still far from what you needed.
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