Hibernate/JPA: Mapeamento de tipos Java para SQL

Fonte: http://docs.oracle.com/cd/E19159-01/819-3672/gbxjk/index.html

Java Type	Java DB, Derby, CloudScape	Oracle	DB2	Sybase	MS-SQL Server	MySQL Server
boolean,java.lang.Boolean	SMALLINT	NUMBER(1)	SMALLINT	BIT	BIT	TINYINT(1)
int,java.lang.Integer	INTEGER	NUMBER(10)	INTEGER	INTEGER	INTEGER	INTEGER
long, java.lang.Long	BIGINT	NUMBER(19)	INTEGER	NUMERIC(19)	NUMERIC(19)	BIGINT
float,java.lang.Float	FLOAT	NUMBER(19,4)	FLOAT	FLOAT(16)	FLOAT(16)	FLOAT
double,java.lang.Double	FLOAT	NUMBER(19,4)	FLOAT	FLOAT(32)	FLOAT(32)	DOUBLE
short,java.lang.Short	SMALLINT	NUMBER(5)	SMALLINT	SMALLINT	SMALLINT	SMALLINT
byte, java.lang.Byte	SMALLINT	NUMBER(3)	SMALLINT	SMALLINT	SMALLINT	SMALLINT
java.lang.Number	DECIMAL	NUMBER(38)	DECIMAL(15)	NUMERIC(38)	NUMERIC(28)	DECIMAL(38)
java.math.BigInteger	BIGINT	NUMBER(38)	BIGINT	NUMERIC(38)	NUMERIC(28)	BIGINT
java.math.BigDecimal	DECIMAL	NUMBER(38)	DECIMAL(15)	NUMERIC(38)	NUMERIC(28)	DECIMAL(38)
java.lang.String	VARCHAR(255)	VARCHAR(255)	VARCHAR(255)	VARCHAR(255)	VARCHAR(255)	VARCHAR(255)
char,java.lang.Character	CHAR(1)	CHAR(1)	CHAR(1)	CHAR(1)	CHAR(1)	CHAR(1)
byte[],java.lang.Byte[],java.sql.Blob	BLOB(64000)	LONG RAW	BLOB(64000)	IMAGE	IMAGE	BLOB(64000)
char[],java.lang.Character[],java.sql.Clob	CLOB(64000)	LONG	CLOB(64000)	TEXT	TEXT	TEXT(64000)
java.sql.Date	DATE	DATE	DATE	DATETIME	DATETIME	DATE
java.sql.Time	TIME	DATE	TIME	DATETIME	DATETIME	TIME
java.sql.Timestamp	TIMESTAMP	DATE	TIMESTAMP	DATETIME	DATETIME	DATETIME