Hibernate type used to map java.lang.Double

Question

I am using "double" in Hibernate .hbm.xml files, and when I generate classes with Hibernate Tool I get class property which has primitive type double. I want this property to be java wrapper type Double. How can I achieve this? If I change this manually in my classes, is it going to give any issues to hibernate?

Thanks

Answer 1

I am using "double" in Hibernate .hbm.xml files, and when I generate classes with Hibernate Tool I get class property which has primitive type double. I want this property to be java wrapper type Double. How can I achieve this?

Is the property nullable in the hbm.xml mapping? If it is, you should get a Double .

If you can't change the mapping, you could override the default behavior:

• override the column specifically in reveng.xml
• use a type-mapping and not-null set to false to handle it for all columns

Answer 2

If you can add below statement under type-mapping in your hibernate.reveng.xml ,then you pojos will be generated with double type as java.lang.Double.

<sql-type jdbc-type="DOUBLE"  not-null="false" hibernate-type="double" /> 

Or

if you can add not-null="false" in your hbm files,that also address your issue.

<property name="salary" type="double">
            <column name="SALARY"  not-null="false" />
        </property>

Answer 3

It only issue you could have is if your property is null amd the column is declared as not null. So I would advise you to always initialize it.