Erroneous Boolean Mapping Hibernate (ArrayIndexOutOfBoundsException)

Question

I have a persistend Book Class with the following properties

• PropertyName -> HibernateMappingType -> JavaType
• id -> long -> long

Answer 1

There are two ways you can achieve the type conversion of attribute

By annotating field with Type

@Type(type = "yes_no")
private boolean isActive;

in DB Y/N will get persisted.

By writing a converter

@Column
@Convert(converter = BooleanConverter.class)
private boolean isActive;

Converter class

public class BooleanConverter implements AttributeConverter<Boolean, Character> {

    @Override
    public Character convertToDatabaseColumn(Boolean attribute) {
        if (attribute)
            return 'Y';
        else
            return 'N';
    }

    @Override
    public Boolean convertToEntityAttribute(Character dbData) {
        if ('Y' == dbData)
            return true;
        else
            return false;
    }

}

in xml you can replace the type attribute with the converter class name or yes_no

<property name="status" column="book_status" type="yes_no" not-null="true"/>

Answer 2

From what I see you are trying to map the BIT type in Database to Boolean in your hibernate code.

There is a bug in MySQL with BIT Value, from version 5.0.3 onwards, in that it does not store a single BIT value. It stores something like SET or ENUM. And that often throws up issues, when you are doing a numeric value comparison. For more details check here

http://www.xaprb.com/blog/2006/04/11/bit-values-in-mysql/

You could ask your DBA to change the datatype to tinyint, however if that is not possible, you can change the status mapping from boolean to numeric_boolean, so would be something like

<property name="status" column="book_status" type="numeric_boolean" not-null="true"/>