Java 如何显示Saml断言节点？

嗨，伙计们，我希望你们都好 我已经用opensaml-j创建了一个saml断言，我想显示它的内容 但当我这样做时，它会在main方法中抛出NullPointerException 有人能告诉我原因吗？？ 这是我的密码

import java.security.SecureRandom;

import org.joda.time.DateTime;
import org.opensaml.core.xml.schema.XSString;
import org.opensaml.core.xml.schema.impl.XSStringBuilder;
import org.opensaml.saml.common.SAMLVersion;
import org.opensaml.saml.saml1.core.NameIdentifier;
import org.opensaml.saml.saml1.core.Subject;
import org.opensaml.saml.saml2.core.impl.EvidenceBuilder;
import org.opensaml.saml.saml1.core.impl.NameIdentifierBuilder;
import org.opensaml.saml.saml1.core.impl.SubjectBuilder;
import org.opensaml.saml.saml2.core.Action;
import org.opensaml.saml.saml2.core.Assertion;
import org.opensaml.saml.saml2.core.Attribute;
import org.opensaml.saml.saml2.core.AttributeStatement;
import org.opensaml.saml.saml2.core.AttributeValue;
import org.opensaml.saml.saml2.core.AuthzDecisionStatement;
import org.opensaml.saml.saml2.core.Conditions;
import org.opensaml.saml.saml2.core.DecisionTypeEnumeration;
import org.opensaml.saml.saml2.core.Evidence;
import org.opensaml.saml.saml2.core.Issuer;
import org.opensaml.saml.saml2.core.impl.ActionBuilder;
import org.opensaml.saml.saml2.core.impl.AssertionBuilder;
import org.opensaml.saml.saml2.core.impl.AttributeBuilder;
import org.opensaml.saml.saml2.core.impl.AttributeStatementBuilder;
import org.opensaml.saml.saml2.core.impl.AuthzDecisionStatementBuilder;
import org.opensaml.saml.saml2.core.impl.ConditionsBuilder;
import org.opensaml.saml.saml2.core.impl.IssuerBuilder;

public class CreateSamlAssertion {

@SuppressWarnings("deprecation")
public static Assertion createAssertion(){
    Assertion assertion=(Assertion)new AssertionBuilder().buildObject();
    assertion.setID(idGenerator());
    assertion.setVersion(SAMLVersion.VERSION_20);
    assertion.setIssueInstant(new DateTime());
    Issuer issuer=(Issuer)new  IssuerBuilder().buildObject();
    issuer.setNameQualifier("tfou");//StaticData.logName
    assertion.setIssuer(issuer);
    Subject subject=(Subject)new SubjectBuilder().buildObject();
    NameIdentifier nameId=(NameIdentifier)new NameIdentifierBuilder().buildObject();
    nameId.setFormat(NameIdentifier.EMAIL);
    nameId.setNameIdentifier("tfou2");//StaticData.destName
    subject.setNameIdentifier(nameId);
    Conditions conditions=(Conditions)new ConditionsBuilder().buildObject();
    conditions.setNotBefore(new DateTime());
    conditions.setNotOnOrAfter(new DateTime().plusMinutes(20));
    assertion.setConditions(conditions);
    AuthzDecisionStatement authDecisionStatement=getAuthzDecisionStatement();
    assertion.getAuthzDecisionStatements().add(authDecisionStatement);
    return assertion;
}

private static AuthzDecisionStatement getAuthzDecisionStatement(){
    AuthzDecisionStatement aDStatement=(AuthzDecisionStatement)new AuthzDecisionStatementBuilder().buildObject();
     DecisionTypeEnumeration decision = DecisionTypeEnumeration.PERMIT;
    aDStatement.setDecision(decision);
    aDStatement.setResource("http://www.hb.com/Resources/Resource A1");
    Action actions=getAction();
    actions.setNamespace("http://www.hb.com/Resources/");
    aDStatement.getActions().add(actions);
    Evidence evidence=getEvidence();
    aDStatement.setEvidence(evidence);
    return aDStatement;
}


private static Evidence getEvidence(){

    Evidence evidence=(Evidence) new EvidenceBuilder().buildObject();
    Assertion assertion=(Assertion)new AssertionBuilder().buildObject();
    AttributeStatement aStatement=(AttributeStatement) new AttributeStatementBuilder().buildObject();
    Attribute attribute1=(Attribute)new AttributeBuilder().buildObject();
    attribute1.setName("IssuerCapabilityID");

     XSString attrValue1 = (XSString)new XSStringBuilder().
             buildObject(AttributeValue.DEFAULT_ELEMENT_NAME, XSString.TYPE_NAME);
     attrValue1.setValue("Cap01");
     attribute1.getAttributeValues().add(attrValue1);

    Attribute attribute2=(Attribute)new AttributeBuilder().buildObject();
    attribute2.setName("IssuerCapabilityID");
    XSString attrValue2 = (XSString)new XSStringBuilder().
             buildObject(AttributeValue.DEFAULT_ELEMENT_NAME, XSString.TYPE_NAME);
     attrValue2.setValue("Cap02");
     attribute2.getAttributeValues().add(attrValue2);


    aStatement.getAttributes().add( attribute1);
    aStatement.getAttributes().add(attribute2);
    assertion.getAttributeStatements().add((org.opensaml.saml.saml2.core.AttributeStatement) aStatement);
    evidence.getAssertions().add(assertion);
    return evidence;
}

private static Action getAction(){
    Action action=(Action)new ActionBuilder().buildObject();
    action.setAction("Read");
    action.setAction("Write");
    return action;
}

private static String idGenerator(){
    SecureRandom random=new SecureRandom();
    return String.valueOf(random.nextInt());
}
}

这是主要课程：

import org.opensaml.core.xml.io.MarshallingException;
import org.opensaml.saml.saml2.core.Assertion;
import org.opensaml.saml.saml2.core.impl.AssertionMarshaller;
import org.opensaml.xml.util.XMLHelper;
import org.w3c.dom.Element;


public class SamlTest {

public static void main(String[] args) throws MarshallingException {
    // TODO Auto-generated method stub
    Assertion assertion=CreateSamlAssertion.createAssertion();
    AssertionMarshaller marshaller = new AssertionMarshaller();
    Element plaintextElement = marshaller.marshall(assertion);
    String originalAssertionString = XMLHelper.nodeToString(plaintextElement);

    System.out.println("Assertion String: " + originalAssertionString);
}
}

这是堆栈跟踪

线程“main”java.lang.NullPointerException中的异常 位于org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport.getMarshallerFactory（XMLObjectProviderRegistrySupport.java:116） 位于org.opensaml.core.xml.io.AbstractXMLObjectMarshaller。（AbstractXMLObjectMarshaller.java:68） 位于org.opensaml.saml.common.AbstractSAMLObjectMarshaller。（AbstractSAMLObjectMarshaller.java:30） 位于org.opensaml.saml.saml2.core.impl.AssertionMarshaller（AssertionMarshaller.java:34）

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在SamlTest.main（SamlTest.java:14）上，这为引导敲响了警钟。

你在任何地方运行过引导程序吗

DefaultBootstrap.bootstrap();

---

这给自举打响了警钟。

你在任何地方运行过引导程序吗

DefaultBootstrap.bootstrap();

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谢谢你的回答，但现在我有另一个问题，它抛出ClassCastException这里是堆栈跟踪：`Exception in thread“main”java.lang.ClassCastException:org.opensaml.core.xml.schema.impl.XSAnyBuilder无法转换为org.opensaml.xml.xmlObjectBuilder我建议发布一个新问题，作为一个新问题，我暂时不能问，我必须等待2天才能再次询问感谢先生的答案，但现在我有另一个问题，它引发了ClassCastException这是堆栈跟踪：`线程“main”java.lang.ClassCastException中的异常：org.opensaml.core.xml.schema.impl.XSAnyBuilder无法转换为org.opensaml.xml.xmlObjectBuilder我建议发布一个新问题，我暂时不能问，我必须等待2天才能再次问