Serializing objects with arrays - JDBC

Hello,
Are there any known issues with serializing arrays into Blobs with JDBC?
I have an object with a complex array. Its basically name/value pairs, but the values
can be arrays as well. The type of the values array can be of different types, i.e. string, Boolean, int, etc. These arrays are a unioned, and a discriminator identifies what type of array I have.
Array (name, value.discriminator, value) where the value is also an array of some type.
An example of some data would be.
Name = Employee Name values = { Fred} discriminator = StringType
Name = address values = { addr1, addr2, addr3} discriminator = StringType
Name = Insured values = {true} discriminator = booleanType
Name = Some_Int_values values = {1,2,3,4} discriminator = IntegerType
Name = SomeOther_Int_values values = {1,2,3,4} discriminator = IntegerType
It does not need to be that complex it might just be
Name = Employee Name values = { Fred} discriminator = StringType
The issues Im having is before I serialize the object and write it into a blob, I can repeat through the length of the outer array and print the value arrays. After I read the object for the blob, I cannot do this. It seems to have a problem identifying the discriminator type.
Thanks!

421780,
Sounds like a good candidate for XML. Have you considered that? Have you seen Oracle's XML Technology Center?
Good Luck,
Avi.

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Edited by: 942120 on May 1, 2013 8:45 AM
Edited by: 942120 on May 1, 2013 8:46 AM
Edited by: 942120 on May 1, 2013 9:05 AM
Edited by: 942120 on May 1, 2013 9:06 AM

Custom domains are the way to go.
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I populate the table by setting the field I created, but the table is empty in PL/SQL (TEST_TAB.COUNT = 0).
I also tried passing the oracle.jbo.domain.Array object, but that produced an error:
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JDBC 10.2.0.5
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Edited by: 942120 on May 13, 2013 7:16 AM

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Just to clairify: The server doesn't have to do anything with the content of "data" apart from holding on to it, and pass it to another applet?
If that's the case substitute the Object in the "data" field for an array of bytes obtained by having the applet run the "Object" through ObjectOutputStream.
What's happening is that the server is deserializing the Packet when it arrives in the JVM of the server, when it comes across the "data" field it looks to see what class the instance really is, and fails as you dscribe if it doesn't have the class definition.

Size of serialized Objects

Hello everybody,
When I serialize a object to a Byte Array the size of the Byte Array is not exactly the size of the object because of some meta data information. Is there any way there I can predict excatly the size that the Object will have when I serialize it? Of course I known the attributes size of this Object.
For example if I have an Object X with two attributes Integer A and B with 4 bytes each, I'd like to predict that the Byte Array of this serialized Object wil have 10 bytes (8 for the two attributes and 2 for meta data). Does anybody have an idea?
Thanks,
Bruno

Is
there any way there I can predict excatly the size
that the Object will have when I serialize it?Yes. You can serialize it to a byte array, then take the size of that. Then you can send the byte array instead of serializing the original object.
Basically this is something that's very unlikely to be useful. What are you trying to achieve and why do you think you need to know this information?
Dave.

Serializing objects with arrays - JDBC

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