EDIT

@org.hibernate.annotations.GenericGenerators(

	{

		/* generates identifiers of type long, short or int that are unique only when no other process 

		 * is inserting data into the same table. Do not use in a cluster or multiple client environment */

		@GenericGenerator(		

				name="system-increment", 

				strategy = "increment"

		),

		/* supports identity columns in DB2, MySQL, MS SQL Server, Sybase and HypersonicSQL. 

		 * The returned identifier is of type long, short or int. */

		@GenericGenerator(

				name="system-identity", 

				strategy = "identity"

		),

		/* uses a hi/lo algorithm to efficiently generate identifiers of type long, short or int, 

		 * given a table and column (by default hibernate_unique_key and next_hi respectively) as 

		 * a source of hi values. The hi/lo algorithm generates identifiers that are unique only 

		 * for a particular database. */

		@GenericGenerator(

				name="system-hilo", 

				strategy = "hilo"

		),

		/* uses a sequence in DB2, PostgreSQL, Oracle, SAP DB, McKoi or a generator in Interbase. 

		 * The returned identifier is of type long, short or int */

		@GenericGenerator(

				name="system-sequence", 

				strategy = "sequence"

		),

		/* selects identity, sequence or hilo depending upon the capabilities of the underlying database. */

		@GenericGenerator(

				name="system-native", 

				strategy = "native"

		),

		/* Steve Ebersole of Hibernate highly recommends the use of the two new generators

		 * http://relation.to/2082.lace

		 * Also see: http://docs.jboss.org/hibernate/core/3.3/reference/en/html/mapping.html#mapping-declaration-id-enhanced

		 */

		/* new table generator */

		@GenericGenerator(

				name="enhanced-table", 

				strategy = "org.hibernate.id.enhanced.TableGenerator",

				parameters = {

				    @Parameter(name="optimizer", value = "pooled"),

				    @Parameter(name="increment_size", value = "10")

				}

		),

		/* new sequence generator */

		@GenericGenerator(

				name="enhanced-sequence", 

				strategy = "org.hibernate.id.enhanced.SequenceStyleGenerator",

				parameters = {

			        @Parameter(name="optimizer", value = "pooled"),

			        @Parameter(name="increment_size", value = "10")

			    }

		)

	}

import org.hibernate.annotations.Parameter;