org.hibernate.MappingException: Could not determine type for: String, at table: Persons, for columns: [org.hibernate.mapping.Column(FirstName)]

org.hibernate.MappingException: Could not determine type for: String, at table: Persons, for columns: [org.hibernate.mapping.Column(FirstName)]

Problem:  

In Mapping, the type what you specified that the first character will be in Upper case. In the above exception, type will be String.

Solution: 

In hibernate mapping file, use type string instead of String because in hibernate, the type will be case sensitive.

Java type	Mapping type	ANSI SQL Type
int or java.lang.Integer	integer	INTEGER
long or java.lang.Long	long	BIGINT
short or java.lang.Short	short	SMALLINT
float or java.lang.Float	float	FLOAT
double or java.lang.Double	double	DOUBLE
java.math.BigDecimal	big_decimal	NUMERIC
java.lang.String	character	CHAR(1)
java.lang.String	string	VARCHAR
byte or java.lang.Byte	byte	TINYINT
boolean or java.lang.Boolean	boolean	BIT
boolean or java.lang.Boolean	yes/no	CHAR(1) ('Y' or 'N')
boolean or java.lang.Boolean	true/false	CHAR(1) ('T' or 'F')