How to serialize Java object - converting object as an InputStream

Question

If I write my code like this, it gives an error "File not found access denied ......"

public class ImplRegistration implements IRegistration {
 @Override
    public boolean newRegistration(Registration_BE reg_be) {
        FileOutputStream fos = new FileOutputStream("serial.ser");
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(reg_be);
    }
}

For security reasons, I changed the fourth line of the code to this:

FileOutputStream fos = new FileOutputStream("f://serial.ser");

But then it showed the exception java.io.NotSerializableException: java.io.ByteArrayInputStream.

How can I serialize the object?

Make sure your object to serialize implements the `Serializable` interface. Also, it would be good if you share the problematic code and post the stacktrace instead of the error message. — Luiggi Mendoza, Jun 12 '13 at 04:09
i using windows 8 so even i give c:// also i showing access denied only. — sabarirajan, Jun 12 '13 at 04:09
`C:/` will always give you access denied. Note that in Windows, the path should be like `f:\\\\some\\path`, or again, use `/some/path`. — Luiggi Mendoza, Jun 12 '13 at 04:10
Apparently your `Registration_BE` class includes a non-transient `ByteArrayInputStream` field. This is not serializable, so the entire class is not serializable. — Ted Hopp, Jun 12 '13 at 04:12
really thank you Ted Hopp..i want this reason only y it is not serialize.thank you.. and is there any option to change my object as a inputstream with tat inputstream field. — sabarirajan, Jun 12 '13 at 04:16
Just be aware that that particular field will not be part of the serialized data and will not be restored when the object is recreated. — Ted Hopp, Jun 12 '13 at 04:23
thank you Luiggi Mendoza ted hopp luiggi mendoza its working. — sabarirajan, Jun 12 '13 at 04:25
as you told now i cant receive inputstream in web service, So i remove tat field in my class. but still its not wroking Why? — sabarirajan, Jun 12 '13 at 05:00

score 1 · Answer 1 · edited May 23 '17 at 11:50

1

The serialization operation in this case is failing because, as Ted Hopp states in the comments above, the class you are attempting to serialize contains a non-transient (and non-serializable) ByteArrayInputStream object. To remedy this and make the Registration_BE class serializable, you can mark this field as transient:

class Registration_BE {
  // rest of class

  private transient ByteArrayInputStream bais = null;

  // rest of class
}

This will cause it to be omitted from the serialization process of Registration_BE, but will also cause it to be uninitialized when the object is deserialized on the other end.

If you wish to initialize the ByteArrayInputStream after deserialization, you may want to consider writing custom writeObject / readObject methods for the Registration_BE class. There are many tutorials on custom serialization available on Google. The information in this thread might help to get you started:

Uses of readObject/writeObject in Serialization

edited May 23 '17 at 11:50

Community

1
1

answered Jun 12 '13 at 04:43

Houser

41
6

Kotz thank you. as ted stated now i cant receive inputstream in web service, So i remove tat field in my class. but still its not wroking Why? – sabarirajan Jun 12 '13 at 05:00
Please be more specific than "it's still not working". Is it producing a new error message after you removed the field? If so, please post it, preferably with a stacktrace. Perhaps post the code for your class as well if possible. – Houser Jun 12 '13 at 05:05
http://stackoverflow.com/questions/17057927/getting-error-while-receiving-object-in-restful-webservice – sabarirajan Jun 12 '13 at 05:07

score 0 · Answer 2 · answered Jun 12 '13 at 04:20

0

If you try to access file in your operation system(OS) partition, it will give access denied error.

answered Jun 12 '13 at 04:20

Ruchira Gayan Ranaweera

34,993
17
75
115

this is not relevant, look at the comments above, the issue was the ByteArrayInputStream was not serialisable – Has AlTaiar Jun 12 '13 at 04:22

How to serialize Java object - converting object as an InputStream

2 Answers2