I get exactly the same error message when trying to use the Databaseserver loginmodule. I use JBoss 4.2.3. In the log there is the following: javax.security.auth.login.LoginException: java.lang.NullPointerException | at org.jboss.security.auth.spi.DatabaseServerLoginModule.getUsersPassword(DatabaseServerLoginModule.java:141) | at org.jboss.security.auth.spi.UsernamePasswordLoginModule.login(UsernamePasswordLoginModule.java:206) | It seems from the source file, that the Datasource returned is null. It's the following source in the login module: InitialContext ctx = new InitialContext(); | DataSource ds = (DataSource) ctx.lookup(dsJndiName); | conn = ds.getConnection(); | I configured everything from the documentation. login-config.xml: <application-policy name = "nedbDbLogin"> | <authentication> | <login-module code="org.jboss.security.auth.spi.DatabaseServerLoginModule" | flag="required"> | <module-option name="dsJndiName">java:jdbc/bavnedb</module-option> | <!--<module-option name="hashAlgorithm">MD5</module-option> | <module-option name="hashEncoding">base64</module-option> --> | <module-option name="principalsQuery"> | select password from USER where LOGIN_ID=?</module-option> | <module-option name="rolesQuery"> | select 'Nedb_User', 'Roles' from USER where LOGIN_ID=?</module-option> | </login-module> | </authentication> | </application-policy> | jboss-web.xml: | <?xml version="1.0" encoding="UTF-8"?> | <jboss-web> | <security-domain>java:/jaas/nedbDbLogin</security-domain> | </jboss-web> The code for the programmatic login: | UsernamePasswordHandler handler = new UsernamePasswordHandler(userId, password); | | LoginContext loginContext = new LoginContext(LOGIN_CONTEXT, | (CallbackHandler) handler); | loginContext.login(); | Do you have any idea what can be wrong? Thanks in advance View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4254426#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...