External Java clients (stand alone clients or servers from other cells) with Java Naming and Directory Interface (JNDI) access can look up a Java 2 Connector (J2C) resource such as a data source or Java Message Service (JMS) queue. However, they are not permitted to take advantage of the component managed authentication alias defined on the resource. This alias is a default value used when the user and password are not supplied on the getConnection() call. Therefore, if an external client needs to get a connection, it must assume responsibility for the authentication by passing it through arguments on the getConnection() call.
Any client running in the WebSphere Application Server process (such as a Servlet or an enterprise bean) within the same cell that can look up a resource in the JNDI namespace can obtain connections without explicitly providing authentication data on the getConnection() call. In this case, if the component's res-auth setting is Application , authentication is taken from the component-managed authentication alias defined on the connection factory. With res-auth set to Container , authentication is taken from the login configuration defined on the component's resource-reference. It is important to note that J2C authentication alias is per cell . An enterprise bean or Servlet in one application server cannot look up a resource in another server process which is in a different cell, because the alias would not be resolved.