Simple helper class providing manual lookup for CDI beans in non-managed environment

ManualContext.java

import java.util.Iterator;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

/**
 * Provides simple way how to obtain the instance of managed beans
 * in non-managed environment (POJOs, etc).
 *
 * @author Vaclav Svejcar ([email protected])
 */
public class ManualContext {

	private final Context ctx;
	private final BeanManager beanManager;

	public ManualContext() {
		try {
			ctx = new InitialContext();

			// manual JNDI lookupCDI for the CDI bean manager (JSR 299)
			beanManager = (BeanManager) ctx.lookup(
					"java:comp/BeanManager");
		} catch (NamingException ex) {
			throw new IllegalStateException(
					"cannot perform JNDI lookup for CDI BeanManager");
		}
	}

	/**
	 * Returns the instance of the CDI managed bean, specified by its class type
	 * and optionally by annotations/qualifiers.
	 *
	 * @param <T> class type of the desired CDI managed bean
	 * @param theClass class of the desired CDI manager bean
	 * @param annotations CDI manager bean annotations/qualifiers
	 * @return instance of the CDI managed bean
	 */
	public <T> T lookupCDI(Class<T> theClass, Annotation... annotations) {
		Iterator<Bean<?>> it = beanManager.getBeans(theClass, annotations).iterator();
		if (!it.hasNext()) {
			throw new IllegalStateException(
					"cannot find instance of the requested type: "
					+ theClass.getName());
		}
		Bean<T> bean = (Bean<T>) it.next();
		CreationalContext cCtx = beanManager.createCreationalContext(bean);
		T beanReference = (T) beanManager.getReference(bean, theClass, cCtx);

		return beanReference;
	}
}