OpenSAML user discussion

Hi all,

Within the framework of my engineering school and my internship at the 
University of Amsterdam, I am working on a project about SAML2.0 and the 
library opensaml2.0.

In a first step, I implemented the opensaml2.0 library successfully by using 
the
Web site and documentations. And now, I try to implement the SAML 2.0 profile 
of
XACML 2.0.

I would like to construct an <saml:Statement 
xsi:type"xacml-saml:XACMLAuthzDecisionStatementType"> and (in the future) an 
<saml:Statement xsi:type"xacml-saml:XACMLPolicyStatementType"> in order to get
something like that :
 <choice minOccurs="0" maxOccurs="unbounded">    
     <element ref="saml:Statement"/>
         <XACMLAuthzDecisionStatement with request and response> or
         <XACMLPolicyStatement with policy and policySet>
     <element ref="saml:AuthnStatement"/>
     <element ref="saml:AuthzDecisionStatement"/>
     <element ref="saml:AttributeStatement"/>
 </choice>
 
First, I created a new SAML Object XACMLAuthzDecisionStatement with 
 - the interface, 
 - the implementation, 
 - the builder, 
 - the marshaller and 
 - the unmarshaller (like on the openSAML manual
 https://spaces.internet2.edu/display/SHIB/OSTwoDeveloperManual). I added 
these java programs in my opensaml2.0 library (saml2.core for the first and 
saml2.core.impl for the others).

I used an element QName to create the SAML Object. But, I have a problem and 
I think it is here (XACMLAuthzDecisionStatement.java) :
  /** Element local name. */
  public static final String DEFAULT_ELEMENT_LOCAL_NAME = 
"XACMLAuthzDecisionStatement";
 
  /** Default element name. */
  public static final QName DEFAULT_ELEMENT_NAME = new QName( 
SAMLConstants.SAML20_NS,DEFAULT_ELEMENT_LOCAL_NAME,SAMLConstants.SAML20_PREFIX);
 
  /** Local name of the XSI type. */
  public static final String TYPE_LOCAL_NAME = 
"XACMLAuthzDecisionStatementType";
 
  /** QName of the XSI type. */
  public static final QName TYPE_NAME = new QName(SAMLConstants.SAML20_NS,
TYPE_LOCAL_NAME, SAMLConstants.SAML20_PREFIX);
 
It's the same thing in the other files. I don't know what I have to make or 
modify (for example in the SAMLConstants.java file and schemas).

Then, when I integrate this new object in my Java program, I always have the 
same error (java.lang.NullPointerException). I think the problem comes that 
my program doesn't know the new type (XACMLAuthzDecisionStatementType).

 // Get the builder factory  
 XMLObjectBuilderFactory builderFactory =  
org.opensaml.xml.Configuration.getBuilderFactory();
 
 //===> Error XACMLAuthzDecisionStatementBuilder
 XACMLAuthzDecisionStatementBuilder xacmlauthz=
(XACMLAuthzDecisionStatementBuilder)builderFactory.getBuilder(XACMLAuthzDecisionStatement.DEFAULT_ELEMENT_NAME);
 
 //Use XACMLAuthzDecisionStatement
 XACMLAuthzDecisionStatement objectxacmlauthz = xacmlauthz.buildObject();
 
For information, I don't use schemas, I just try to get a SAML2.0 XML file
(profile of XACML 2.0).

I hope that you can give me some advices and I thank you in advance for your 
help.

Yours faithfully,

RAYNAL Sylvain