insert images, pdf, videos into oracle using JPA

Thanks for your solution. I read all those documents. But still I did not know how to insert and retrieve.
After reading those, I came to know that annotation @Lob should be used for byte array type to store image.
@Lob
private byte[] picture;


I used this method to convert image file to bytes,
public static byte[] writingImage(String fileLocation) {
byte b[] = null;
try {
FileInputStream fis=new FileInputStream(new File(fileLocation));
fis.read(b);
return b;
} catch (IOException e) {
}
return null;
}

For setting value for the above picture variable, i did this.,
void setPicture(byte[] picture)
{
this.picture=picture;
}

In main method,
objectname.setPicture(writingImage("c:\img\image.jpg"));

In main method I did this, and persisted it.
I dont know whether that is the right way. Also dont know how to retrieve it back.

How to do that actually??