New transaction without using UserTransaction

Manager.java

package ejb.tx;

import java.util.List;

import javax.ejb.Local;

@Local
public interface Manager {
	void processAll(List<Object> list);
}

ManagerBean.java

package ejb.tx;

import java.util.List;

import javax.annotation.Resource;
import javax.ejb.Local;
import javax.ejb.SessionContext;
import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;

@Stateless
public class ManagerBean implements Manager, ManagerInternal {
	@Resource
	private SessionContext context;

	@Override
	public void processAll(List<Object> list) {
		ManagerInternal txThis = context.getBusinessObject(ManagerInternal.class);
		for (Object obj : list) {
			txThis.processOne(obj);
		}
	}

	@Override
	@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
	public void processOne(Object obj) {
		/* ... */
	}
}

@Local
interface ManagerInternal {
	void processOne(Object obj);
}