ClassCircularityError in JAAS Authorization with Weblogic Server 10.3

Question

We are implementing JAAS authorization in which roles and policies are stored in a custom JAAS policy file and users are stored in the embedded LDAP server provided by Weblogic. We are facing problem is authorizing users using the custom policy created.
We have implemented the JAAS authentication service with weblogic server 10g R3 and user's information stored in embedded LDAP server provided WLS. Given below are the details of implementation for JAAS Authorization:
Following are the custom classes created:
1. Custom Principal Class
public class Principal implements java.security.Principal, java.io.Serializable {
private String name;
public Principal() {
name = "";
public Principal(String newName) {
name = newName;
public boolean equals(Object o) {
if (o == null)
return false;
if (this == o)
return true;
if (o instanceof Principal) {
if (((Principal) o).getName().equals(name))
return true;
else
return false;
else
return false;
public int hashCode() {
return name.hashCode();
public String toString() {
return name;
public String getName() {
return name;
2. Custom Permission Class
public class ActionPermission extends Permission {
     public ActionPermission(String name) {
          super(name);
     @Override
     public boolean equals(Object obj) {
          if ((obj instanceof ActionPermission)
                    && ((ActionPermission) obj).getName().equals(this.getName())) {
               return true;
          } else {
               return false;
     @Override
     public String getActions() {
          return "";
     @Override
     public int hashCode() {
          return this.getName().hashCode();
     @Override
     public boolean implies(Permission permission) {
          if (!(permission instanceof ActionPermission)) {
               return false;
          String thisName = this.getName();
          String permName = permission.getName();
          if (this.getName().equals("*")) {
               return true;
          if (thisName.endsWith("*")
                    && permName.startsWith(thisName.substring(0, thisName
                              .lastIndexOf("*")))) {
               return true;
          if (thisName.equals(permName)) {
               return true;
          return false;
Following are the configuration changes:
1. Added custom policy to weblogic.policy.
grant Principal com.scotia.security.authorization.Principal "test" <User defined in the embedded LDAP server of WLS>{
permission com.scotia.security.authorization.permission.ActionPermission "viewScreen";
2. Set the java security manager in startWeblogic.cmd file.
%JAVA_HOME%\bin\java %JAVA_VM% %MEM_ARGS% %JAVA_OPTIONS% -Dweblogic.Name=%SERVER_NAME% -Djava.security.manager -Djava.security.policy=%WL_HOME%\server\lib\weblogic.policy %PROXY_SETTINGS% %SERVER_CLASS%
3. Set Realm "Security Model" to "Custom Roles and Policies".
Right now we are facing the given below exception:
java.lang.ClassCircularityError: com/scotia/security/authorization/THORPrincipal
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:247)
     at sun.security.provider.PolicyFile.addPermissions(PolicyFile.java:1381)
     at sun.security.provider.PolicyFile.getPermissions(PolicyFile.java:1268)
     at sun.security.provider.PolicyFile.getPermissions(PolicyFile.java:1231)
     at sun.security.provider.PolicyFile.getPermissions(PolicyFile.java:1167)
     at sun.security.provider.PolicyFile.implies(PolicyFile.java:1122)
     at weblogic.security.service.WLSPolicy.implies(Unknown Source)
     at java.security.ProtectionDomain.implies(ProtectionDomain.java:213)
     at java.security.AccessControlContext.checkPermission(AccessControlContext.java:301)
     at java.security.AccessController.checkPermission(AccessController.java:546)
     at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
     at java.lang.SecurityManager.checkRead(SecurityManager.java:871)
     at java.io.File.exists(File.java:731)
     at weblogic.utils.classloaders.DirectoryClassFinder.getSource(DirectoryClassFinder.java:36)
Please help if anyone has some clue regarding this exception. We tried checking the jdk version used by eclipse and weblogic and found it to be same.

Answer 1

1. Custom Principal Class
public class Principal implements java.security.Principal, java.io.Serializable {Rename it. You are asking for trouble naming a class after an interface it implements.
java.lang.ClassCircularityError: com/scotia/security/authorization/THORPrincipalWhat's that class? You haven't shown us.