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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
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/*
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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 *
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package com.sun.faces.application.annotation;

import com.sun.faces.util.Util;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import javax.persistence.PersistenceUnit;

/**
 * Scanner implementation responsible for {@link PersistenceUnit} annotations.
 */
class PersistenceUnitScanner implements Scanner {

    /**
     * Get the annotation we handle.
     *
     * @return the annotation we handle.
     */
    @Override
    public Class getAnnotation() {
        return PersistenceUnit.class;
    }

    /**
     * Scan the specified class for the given annotation.
     *
     * @param clazz the class.
     * @return the runtime annotation handler.
     * @todo Make sure we get all the fields, handle method and class based injection, handle PersistenceUnits.
     */
    @Override
    public RuntimeAnnotationHandler scan(Class clazz) {
        Util.notNull("clazz", clazz);
        PersistenceUnitHandler handler = null;

        ArrayList fieldAnnotations = new ArrayList();
        ArrayList fields = new ArrayList();

        for (Field field : clazz.getDeclaredFields()) {
            PersistenceUnit fieldAnnotation = field.getAnnotation(PersistenceUnit.class);
            if (fieldAnnotation != null) {
                fieldAnnotations.add(fieldAnnotation);
                fields.add(field);
            }
        }
        
        ArrayList methodAnnotations = new ArrayList();
        ArrayList methods = new ArrayList();
        for (Method method : clazz.getDeclaredMethods()) {
            PersistenceUnit methodAnnotation = method.getAnnotation(PersistenceUnit.class);
            if (methodAnnotation != null) {
                methodAnnotations.add(methodAnnotation);
                methods.add(method);
            }
        }
        
        if (!fieldAnnotations.isEmpty() || !methodAnnotations.isEmpty()) {
            handler = new PersistenceUnitHandler(
                    methods.toArray(new Method[0]), methodAnnotations.toArray(new PersistenceUnit[0]),
                    fields.toArray(new Field[0]), fieldAnnotations.toArray(new PersistenceUnit[0]));
        }
        return handler;
    }
}