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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

package net.java.ao.schema;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Defines a database index.
 *
 * 
 *     The index can be either simple or composite.
 *     Please note that the actual name of the index may differ. This field is case insensitive.
 * 
 *
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({})
public @interface Index {

    /**
     * @return the table unique index name.
     */
    String name();

    /**
     * @return an array of accessors or mutators to the columns that should be included in the index.
     */
    String[] methodNames();
}