How to use byte[] with annotations?

jemiller · **Posted:** Mon Mar 14, 2005 6:16 pm

Hibernate version: hibernate-3.0rc1, hibernate-annotations-3.0alpha3

I have a POJO which has a property like the following. I found that when I run SchemaExport to create the database schema that it sets the SQL data type to tinyint.

Code:

public byte[] getCV() {
   return cv;
}

I'm able to specify that the data type should be longblob using the following annotation.

Code:

@Column(columnDefinition="longblob")

However, when, I attempt to persist the object, I receive the following exception. I think it's basically treating the byte[] as a byte instead.

Code:

Caused by: java.lang.ClassCastException: [B
        at org.hibernate.type.ByteType.set(ByteType.java:38)

I found the following link which describes how to deal with BLOBs using a custom UserType and a mapping file. What I'm wondering is if I'll need to use a mapping file to do what I want to do?

[url]http://www.hibernate.org/73.html
[/url]

The other thing that I'm wondering is if there is a DBMS independent way to deal with BLOBs? Or, is it the case that you pretty much have to write DBMS specific code when using BLOBs? If it's the later, I'll probably just store the data in the file system instead.

f0rth · **Posted:** Tue Mar 15, 2005 6:49 am

I use @Type(type="binary") and it works.

jemiller · **Posted:** Tue Mar 15, 2005 12:18 pm

Thanks for the pointer. I'll give that a try. I was just looking at the EJB annotations. I hadn't realized there were Hibernate specific ones there. I heard about them, I just didn't realize they already exist. One thing that would be great is if the next version of the annotations package included java docs documentation. So, far I just been running javadoc myself except I receive a lot of errors because I don't think I have my build environment setup correctly.

emmanuel · **Posted:** Fri Mar 18, 2005 5:32 am

@Serialized will be available in the next version and its plain EJB3 :-)

ericeberry1 · **Joined:** Fri Jul 08, 2005 5:18 pm **Posts:** 10

It looks like @Serialized was remove.

Is there any EJB 3 compliant to map a binary to a byte[]?

I can use the @Type, but I would prefer not to use Hibernate specified stuff if possible.

emmanuel · **Posted:** Mon Jul 11, 2005 12:37 pm

I fixed the bug in Annotations HEAD
it should be the default for byte[] annotated with @Basic or not annotated at all.

In the current version, @Type is required. Sorry about that.