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This is the full Active Objects library, if you don't know which one to use, you probably want this one.

There is a newer version: 6.1.1

/*
 * Copyright 2007 Daniel Spiewak
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at
 * 
 *	    http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.java.ao;

import net.java.ao.schema.AutoIncrement;
import net.java.ao.schema.FieldNameConverter;
import net.java.ao.schema.NotNull;
import net.java.ao.schema.PrimaryKey;
import net.java.ao.schema.TableNameConverter;

/**
 * A specific extension of {@link RawEntity} providing the {@link #getID()}
 * method.  This interface should be sufficient for most entity needs.  Only
 * in cases where custom primary keys are required should RawEntity
 * be directly extended.
 *
 * Entity is the superinterface for most entity interfaces.  For
 * example, the following code defines an entity which maps to the "company"
 * table (depending on what {@link TableNameConverter} is in use) with fields
 * "name", "publiclyTraded" and "id" (names depending on the {@link FieldNameConverter}
 * in use):
 *
 * public class Company extends Entity {
 *     public String getName();
 *     public void setName(String name);
 *
 *     public boolean isPubliclyTraded();
 *     public void setPubliclyTraded(boolean publiclyTraded);
 * }
 *
 * @author Daniel Spiewak
 * @see net.java.ao.RawEntity
 */
public interface Entity extends RawEntity {

    /**
     * Retrieves the value of the "id" field in the entity; that is, the primary key.  As
     * this is the primary key, no database query will correspond with this method
     * invocation.
     *
     * For the moment, primary key fields are immutable.  However, this will
     * change before the 1.0 release as there are numerous use-cases for changing
     * the value of a row's primary key field.
     *
     * @return The value of the primary key for the row, the "id" field.
     */
    @AutoIncrement
    @NotNull
    @PrimaryKey("ID")
    public int getID();
}