Array size of 0 for nillable variable in deserialization of SOAP messages
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Key: AXIS2C-920
URL: https://issues.apache.org/jira/browse/AXIS2C-920
Project: Axis2-C
Issue Type: Bug
Components: wsdl2c tool
Affects Versions: Current (Nightly)
Reporter: Frank Huebbers
Hi,
I am using Axis2/C in one of our applications to talk to our application server
running Axis (java). I have run into problems where the return message isn't
parsed because an array type of size zero with nillable=false is considered to
be null by Axis2/C.
In other words, I can give the following scenario:
I want to send a SOAP message describing a book with an array list of authors.
In my wsdl file, I have made the array type for the authors to be
nillable=false as null types can generate problems for me on other systems. I
still need to be able to send an empty array of authors however, to support
special cases where no author is known for the book. So, when a SOAP message is
received by my client which uses Axis2/C to deserialize it, I would expect
Axis2/C to be able to recognize that an array of length zero was sent. What the
generated code does instead, however, is that it thinks that the array type was
set to null and thus throws an error. I would consider this to be incorrect
behavior.
When looking at the SOAP message, I have observed that an array size of 0 for a
type is not distinguishable from an array type which was set to null and then
sent. Specifically, the type is not shown in the message. Which is probably the
root cause of this problem. What I have observed in these cases, however, is
that C# and Axis Java are able to figure out that these array types are not
null but arrays of size 0 (when they are defined as nillable=false in the wsdl
files).
Considering the facts above, I would thus suggest that the deserialization of
the SOAP message for array types of size 0 follow a similar algorithm as is
done in other implementations; otherwise, people will be forced to use
different wsdl files for Axis2/C and other libraries.
Any comments?
Thanks for any help and advice in advance.
Cheers,
Frank
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