XACML Class cast exception - xacml

Question

I am new to XACML and getting the following error
java.lang.String cannot be cast to com.sun.xacml.ctx.Attribute
at com.sun.xacml.BasicEvaluationCtx.setupSubjects(BasicEvaluationCtx.java:252)
I have defined my attribute something like this:
Set subjects=new HashSet();
subjects.add("Julius Hibbert");
Subject subject = new Subject(subjects);
Set subjectList=new HashSet();
subjectList.add(subject);
value = new AnyURIAttribute(new URI("http://medico.com/record/patient/BartSimpson"));
Attribute resource = new Attribute(new URI("urn:oasis:names:tc:xacml:1.0:resource:resource-id"), null, null, value);
Set resourceAttrs=new HashSet();
resourceAttrs.add(resource);
Set actionAttrs=new HashSet();
DateTimeAttribute date=new DateTimeAttribute();
AttributeValue attvalue=new StringAttribute("read");
Attribute action = new Attribute(new URI("urn:oasis:names:tc:xacml:1.0:action:action-id"), "", date, attvalue);
actionAttrs.add(action);
Set env=new HashSet();
RequestCtx request = new RequestCtx(subjects, resourceAttrs,
actionAttrs, environmentAttrs);
My XACML file is:
<?xml version="1.0" encoding="UTF-8"?>
<Policy
xmlns="urn:oasis:names:tc:xacml:2.0:policy:schema:os"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:oasis:names:tc:xacml:2.0:policy:schema:os
http://docs.oasis-open.org/xacml/2.0/access_control-xacml-2.0-context-schema-os.xsd"
PolicyId="urn:oasis:names:tc:xacml:2.0:conformance-test:IIA1:policy"
RuleCombiningAlgId="urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:deny-overrides">
<Description>
Policy for Conformance Test IIA001.
</Description>
<Target/>
<Rule
RuleId="urn:oasis:names:tc:xacml:2.0:conformance-test:IIA1:rule"
Effect="Permit">
<Description>
Julius Hibbert can read or write Bart Simpson's medical record.
</Description>
<Target>
<Subjects>
<Subject>
<SubjectMatch
MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
<AttributeValue
DataType="http://www.w3.org/2001/XMLSchema#string">Julius Hibbert</AttributeValue>
<SubjectAttributeDesignator
AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id"
DataType="http://www.w3.org/2001/XMLSchema#string"/>
</SubjectMatch>
</Subject>
</Subjects>
<Resources>
<Resource>
<ResourceMatch
MatchId="urn:oasis:names:tc:xacml:1.0:function:anyURI-equal">
<AttributeValue
DataType="http://www.w3.org/2001/XMLSchema#anyURI">http://medico.com/record/patient/BartSimpson</AttributeValue>
<ResourceAttributeDesignator
AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id"
DataType="http://www.w3.org/2001/XMLSchema#anyURI"/>
</ResourceMatch>
</Resource>
</Resources>
<Actions>
<Action>
<ActionMatch
MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
<AttributeValue
DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
<ActionAttributeDesignator
AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id"
DataType="http://www.w3.org/2001/XMLSchema#string"/>
</ActionMatch>
</Action>
<Action>
<ActionMatch
MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
<AttributeValue
DataType="http://www.w3.org/2001/XMLSchema#string">write</AttributeValue>
<ActionAttributeDesignator
AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id"
DataType="http://www.w3.org/2001/XMLSchema#string"/>
</ActionMatch>
</Action>
</Actions>
</Target>
</Rule>
</Policy>
Where am I going wrong?I am using Sun XACML implementation.

Answer 1

After observing your code I found that you are trying to cast a String type to Attribute Type of class com.sun.xacml.ctx.Attribute. Pass the parameters as it is defined by the attribute class : Attribute Class
Paste your code in the Pastebin so that i can take a look.