Converting EmailMessage to ByteArrayOutputStream

Question

I am fetching email from Exchange server using Java EWS API (EWS - Exchange Web Services) and storing it in a proprietary CMS. The type in which I am getting message is microsoft.exchange.webservices.data.EmailMessage - a class provided by EWS API. The CMS API requires ByteArrayOutputStream object as a parameter to its method.

So I want to convert EmailMessage object to ByteArrayOutputStream. I saw this thread and tried similar like this: (Below item is of type EmailMessage)

ByteArrayOutputStream b = new ByteArrayOutputStream();
try
{
    ObjectOutputStream o  = new ObjectOutputStream(b);
    o.writeObject((Object)item);
}
catch(IOException ioe)   
{
    ioe.printStackTrace(); 
}

But I am getting

java.io.NotSerializableException: microsoft.exchange.webservices.data.EmailMessage
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)   
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)

I am able to save these EmailMessage objects in .eml format using FileOutputStream, however now I am not able to find the way to convert them to ByteArrayOutputStream. So is there any way to convert FileOutputStream to ByteArrayOutputStream or just directly from EmailMessage to ByteArrayOutputStream.

If you can write it out on the source machine, maybe you can use FileInputStream to read it in and convert that to ByteArrayOutputStream like the example here: stackoverflow.com/a/19689394/151234 — Brendan Hannemann
– Brendan Hannemann, Commented Oct 31, 2013 at 16:36
Yes actually I tried it like - fetching mail from exchange - saving it locally - moving to repository from local path, but now I want to handle this all in-memory, I mean I dont want to store mails on local drive. Thats why I want to convert it directly from EmailMessage, or to be precise without calling write() on FileOutputStream — Mahesha999
– Mahesha999, Commented Oct 31, 2013 at 19:29

Sumit Singh · Accepted Answer · 2013-10-31 11:06:43Z

0

You are getting this exception because your (Object)item's class not implementing Serializable interface. From java doc writeObject(Object obj)

Exceptions are thrown for problems with the OutputStream and for classes that should not be serialized. All exceptions are fatal to the OutputStream, which is left in an indeterminate state, and it is up to the caller to ignore or recover the stream state.

answered Oct 31, 2013 at 11:06

Sumit Singh

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1 Comment

Mahesha999 Over a year ago

Yess I know that but is there anyway around?

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