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java.lang.Throwable	at examples.security.providers.roles.SampleRoleMapperProviderImpl.getRoles(SampleRoleMapperProviderImpl.java:158)	at weblogic.security.service.RoleManager.collectRoles(RoleManager.java:314)	at weblogic.security.service.RoleManager.getRoles(RoleManager.java:281)	at weblogic.security.service.AuthorizationManager.isAccessAllowed(AuthorizationManager.java:608)	at weblogic.servlet.security.internal.WebAppSecurity.hasPermission(WebAppSecurity.java:370)	at weblogic.servlet.security.internal.SecurityModule.checkPerm(SecurityModule.java:125)	at weblogic.servlet.security.internal.CertSecurityModule.checkUserPerm(CertSecurityModule.java:187)	at weblogic.servlet.security.internal.SecurityModule.beginCheck(SecurityModule.java:193)	at weblogic.servlet.security.internal.CertSecurityModule.checkA(CertSecurityModule.java:81)	at weblogic.servlet.security.internal.ServletSecurityManager.checkAccess(ServletSecurityManager.java:185)	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:2960)	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2466)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:152)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:133)