org.hibernate.HibernateException: Wrong column type Found: char, expected: varchar2(255)

Problem:
org.hibernate.HibernateException: Wrong column type Found: char, expected: varchar2(255)

This exception was raised for the mapping:

@Column(name = "CNTRY_NM")
public String getCountry() {
return country;
}

Analysis: This means to say that Hibernate has found char as the dataType of the column in the DATABASE and in your mapping you specified the data type as String.

By default, the Hibernate converts java.lang.String to varchar2(255).

In other words, the data type of ‘CNTRY_NM’ column was defined as CHAR(50 Byte) in the database. Where as the data type of the corresponding attribute in the Entity class is java.lang.String. As there is a mismatch in the columns, the exception is thrown. When you specify schema validation by Hibernate (hibernate.hbm2ddl.auto = validate) this exception is thrown.

Solution:
@Column(name = "CNTRY_NM", columnDefinition = "char")
public String getCountry() {
return country;
}