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From Oliver Wulff <>
Subject Antwort: RE: Dot-Net's "wsdl.exe" and Non-Nullable Value Types
Date Sat, 08 May 2004 08:54:00 GMT

Hi Erik

I do have a similar problem. We're discussing whether it is necessary to
distinguish between a null or an empty (or default) value.

I don't know whether XML schema allows to say that a value type can be
marked as nillable. I'm not sure - maybe it does.
An integer is also a value type in Java but Java provides a holder class
which wraps this value type.

Maybe you can find some information about this in the basic profil 1.0
specification at because it's a real interoperability


                      "Rick Kellogg"                                                     
                      <rmkellogg@comcas        An:       <>
            >                   Kopie:                                 
                                               Thema:    RE: Dot-Net's "wsdl.exe" and Non-Nullable
Value Types                         
                      08.05.2004 06:32                                                   
                      Bitte antworten                                                    
                      an axis-user                                                       

Please see the following for recommendations:

Interoperability Notes on Apache Axis 1.1 and [Microsoft .NET Framework]
1.0/1.1 FAQ

From:Erik Klein []
Sent: Friday, May 07, 2004 12:54 PM
Subject: Dot-Net's "wsdl.exe" and Non-Nullable Value Types

I have built a webservice using Apache Axis 1.1 that is implemented as RPC
/ Encoded for no reason other than the fact that I have Custom Exceptions
thrown from my Interface and Java2WSDL does not like this.  I also
attempted to use Axis 1.2 Beta to resolve this problem but ran into
additional problems with BeanMappings that I did not understand.

I am attempting to use Dot-Nets wsdl.exe to generate a Web Service Client
in C# from a valid WSDL file generated by Apache Axis.

My application requires the ability to distinguish between an unspecified
value and a specified value.  For that reason, the WSDL that is generated
by Apache Axis utilizes 'nillable="true"' to permit Web Services Clients to
indicate a value or specify 'nil'.

Here is a portion of the WSDL presenting a problem:
<complexType abstract="true" name="Type">
    <element name="localId" nillable="true" type="xsd:string"/>
    <element name="id" minOccurs="0" maxOccurs="1" nillable="true"

When wsdl.exe generates its class from this, it creates the following:
public abstract class Type {
  public string localId;
  public int id;

The problem is that the "int" is a Value Type that is incapable of storing
null.  I have tried the following all to no avail:
1. Replacing 'type="xsd:int"' with 'type="soapenc:int' (which made Java
WSDP work)
2. Including/Removing 'minOccurs' and/or 'maxOccurs'
3. Manually replacing 'public int id' with 'public SqlInt id' (SqlInt is
not the correct name, but its the one from the Dot-Net SQL namespace that
is used to support nulls for ints in the DB ... .NET barked at me when I
attempted to use this telling me it can't be used for XML serialization or
some such thing).

I am out of ideas and wondering if you can guide me to a way to AVOID
having .NET pass a zero(0) when this attribute is not specified (which is
what it currently does for Value Types).  I was hoping to find the
equivalent of java.lang.Integer (which can be null) in C# but have had no

One last note: This WSDL will be consumed by clients who purchase the
software I am developing.  They will be responsible for generating their
own Web Service Clients using the toolkit of their choice, so I am trying
to make it as standardized as possible while requiring minimum client
intervention/recoding when they generate the Web Service client.

Thanks in advance for any suggestions.


p.s. I got no replies to the newsgroup posting I put on

Erik Klein
Versatile Consulting Inc.
621 Lovett Road
Colts Neck, NJ07722

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