OpenSAML user discussion

[mochamaster <>]

I receive a NullPointerException when "fromDOMing" a
Response with an empty StatusMessage:

<Response xmlns="urn:oasis:names:tc:SAML:1.0:protocol"
xmlns:samlp="urn:oasis:names:tc:SAML:1.0:protocol"
InResponseTo="066c27af-771a-4a7c-a8f3-48854d519f1f"
IssueInstant="2003-04-10T19:34:11Z" MajorVersion="1"
MinorVersion="0"
ResponseID="f516b30f-83e6-4e85-8f31-29be55d2fbc9">
  <Status>
    <StatusCode Value="samlp:Success" />
    <StatusMessage />
  </Status>
  <Assertion
xmlns="urn:oasis:names:tc:SAML:1.0:assertion"
AssertionID="a1bac44b-9e62-41d3-ae6a-0cb799617dc3"
IssueInstant="2003-04-10T19:34:11Z"
Issuer="DAS-NYSECAP" MajorVersion="1"
MinorVersion="0">
    <Conditions NotBefore="2003-04-10T19:34:11Z"
NotOnOrAfter="2003-05-10T19:34:11Z" />
    <AuthenticationStatement
AuthenticationInstant="2003-04-10T19:34:11Z"
AuthenticationMethod="urn:oasis:names:tc:SAML:1.0:am:password">
      <Subject>
        <NameIdentifier
NameQualifier="user">nxlabjp4</NameIdentifier>
      </Subject>
    </AuthenticationStatement>
  </Assertion>
</Response>



java.lang.NullPointerException
        at
org.opensaml.SAMLException.fromDOM(SAMLException.java:373)
        at
org.opensaml.SAMLException.<init>(SAMLException.java:230)
        at
org.opensaml.SAMLException.getInstance(SAMLException.java:184)
        at
org.opensaml.SAMLResponse.fromDOM(SAMLResponse.java:180)
        at
org.opensaml.SAMLResponse.<init>(SAMLResponse.java:126)


I don't want to set a StatusMessage value.  My code
uses 

new SAMLException( SAMLException.SUCCESS, "")
in a new SAMLResponse(..) constructor

the "" indicates the status message and is converted
to <StatusMessage /> in toDOM(..). I recommend that
the element is not created if the value is "" (however
a null check is performed).

The existance of the StatusMessage element causes
fromDOM to assume that it has a value and the NPE
occurs there (msg=m.getFirstChild().getNodeValue()).

However there is no way to pass a null Status Message
to the constructor because it creates an ambiguous
ctor call case with SAMLException(QName,String) and
SAMLException(QName,Exception) ctors.



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