Здравствуйте! 
Использую DatabaseServerLoginModule. 
web-xml: 

<security-constraint> 
<web-resource-collection> 
<web-resource-name>protected page</web-resource-name> 
<url-pattern>/protected.jsp</url-pattern> 
<http-method>GET</http-method> 
<http-method>POST</http-method> 
</web-resource-collection> 
<auth-constraint> 
<role-name>admin</role-name> 
</auth-constraint> 
</security-constraint> 

<login-config> 
<auth-method>FORM</auth-method> 
<realm-name>Login page</realm-name> 
<form-login-config> 
<form-login-page>/login.jsp</form-login-page> 
<form-error-page>/login_error.jsp</form-error-page> 
</form-login-config> 
</login-config> 

<security-role> 
<role-name>admin</role-name> 
</security-role> 

В базе есть роль admin. 

Такой exception выпадает: 

org.jboss.resource.JBossResourceException: No matching credentials in Subject! 
at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnectionFactory.getConnectionProperties(BaseWrapperManagedConnectionFactory.java:335) 
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:147) 
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:539) 
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.getConnection(InternalManagedConnectionPool.java:228) 
at org.jboss.resource.connectionmanager.JBossManagedConnectionPool$BasePool.getConnection(JBossManagedConnectionPool.java:417) 
at org.jboss.resource.connectionmanager.BaseConnectionManager2.getManagedConnection(BaseConnectionManager2.java:324) 
at org.jboss.resource.connectionmanager.TxConnectionManager.getManagedConnection(TxConnectionManager.java:301) 
at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:379) 
at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:812) 
at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:8 
at org.jboss.security.auth.spi.DatabaseServerLoginModule.getUsersPassword(DatabaseServerLoginModule.java:141) 
at org.jboss.security.auth.spi.UsernamePasswordLoginModule.login(UsernamePasswordLoginModule.java:206) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at javax.security.auth.login.LoginContext.invoke(Unknown Source) 
at javax.security.auth.login.LoginContext.access$000(Unknown Source) 
at javax.security.auth.login.LoginContext$4.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at javax.security.auth.login.LoginContext.invokeModule(Unknown Source) 
at javax.security.auth.login.LoginContext.login(Unknown Source) 
at org.jboss.security.plugins.JaasSecurityManager.defaultLogin(JaasSecurityManager.java:601) 
at org.jboss.security.plugins.JaasSecurityManager.authenticate(JaasSecurityManager.java:535) 
at org.jboss.security.plugins.JaasSecurityManager.isValid(JaasSecurityManager.java:344) 
at org.jboss.web.tomcat.security.JBossSecurityMgrRealm.authenticate(JBossSecurityMgrRealm.java:491) 
at org.apache.catalina.authenticator.FormAuthenticator.authenticate(FormAuthenticator.java:257) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:416) 
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) 
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) 
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) 
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) 
at java.lang.Thread.run(Unknown Source)

В чем может быть проблема? Подскажите пжста!