Question

I have a Date field in Oracle DB.

Date field1

Now there is a existing DAO that fetches this field1 in form of Object

Object field1

Now I need to typeCast it to java Date

But if i do like following i get error:
Date dt = (Date) object;  //object holds date object
DateTime jdt = new DateTime(dt) ; //convert it to jodaDate

Error : cannot cast Long to Date.

How to convert it to javaDate and than Joda DateTime

Answer 1

You are confusing the datatype DATE in the Oracle DB with the Java type Date. The error cannot cast Long to Date states that the object you are holding is of the Java type Long, which is why the cast to the Java Date type fails. The Long represents the number of seconds or miliseconds since 01/01/1970, depending on yor DOA layer (see it’s documentation), since the DATE precision in Oracle only goes down to seconds. To receive a date, use new Date((long) object) or new Date(1000 * (long) object) respectively.

You also can use those number of milliseconds to generate a DateTime directly without using the Java Date class at all.