How do I create a Principal in Java

How can I create a Principal in Java that can later be added to Websphere's Trust Map via a JAAS authentication module?
Below code is not working as it throws the following exception:
"Caused by: com.ibm.websphere.security.auth.WSLoginFailedException: javax.naming.AuthenticationException: [LDAP: error code 49 - 80090308: LdapErr: DSID-0C090334, comment: AcceptSecurityContext error...."
class PrincipalExt implements Principal, java.io.Serializable {
    private String userName;
    public PrincipalExt()
    public PrincipalExt(String userName) {
        setName(userName);
    public void setName(String name)
        this.userName = name;
    public String getName()
        return userName;
Then, once I have an instance
    public void login() throws LoginException {
        PrincipalExt aPrincipal = new PrincipalExt();
        aPrincipal.setName("someUserID");
        trustMap.put("com.ibm.wsspi.security.common.auth.module.IdentityAssertionLoginModule.trusted", true);
        trustMap.put("com.ibm.wsspi.security.common.auth.module.IdentityAssertionLoginModule.principal", aPrincipal);

Download JFreeChart and give it a try:
http://www.object-refinery.com/jfreechart/index.html
JFreeChart is distributed for free, including the complete source code (subject to the GNU LGPL).
Regards,
Dave Gilbert
JFreeChart Project Leader

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