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The three security annotations, @PermitAll, @DenyAll, and @RoleAllowed, cannot simultaneously be applied to the same class or the same method.

Let s now wrap up our discussion of declarative security management by discussing our final annotation, @RunAs. @RunAs The @RunAs annotation comes in handy if you need to dynamically assign a new role to the existing Principal in the scope of an EJB method invocation. You might need to do this, for example, if you re invoking another EJB within your method but the other EJB requires a role that is different from the current Principal s role. Depending on the situation, the new assumed role might be either more restrictive, lax, or neither. For example, the cancelBid method in listing 6.5 might need to invoke a statistics-tracking EJB that manages historical records in order to delete the statistical record of the canceled bid taking place. However, the method for deleting a historical record might require an ADMIN role. Using the @RunAs annotation, we can temporarily assign a CSR an ADMIN role so that the statistics-tracking EJB thinks an admin is invoking the method:

public class MessageBean implements MessageDrivenBean, MessageListener { private MessageDrivenContext ctx; public void onMessage(Message msg) { MapMessage map = (MapMessage) msg; String symbol = null; String description = null; ErrorHome errorHome = null; try { symbol = map.getString("Symbol"); description = map.getString("Description"); System.out.println("Received Symbol : " + symbol); System.out.println("Received Description : " + description); processEquityMessage( symbol, description ); } catch(Exception e){ e.printStackTrace(); System.out.println("Error Creating Equity with Symbol:"+symbol); System.out.println("Consuming error and " + "passing on to error Handler"); try{ handleError( e, msg ); } catch(Exception errorExc){} } } private void handleError( Exception e, Message msg ) { ErrorHandler handler = lookupErrorEJB(); handler.handleMessageDrivenError( e.getMessage(), msg ); } }

public privileged aspect SQLAccount extends POJOEntity { // EJB- or EJBHome-specific methods public String AccountPOJO.ejbCreate(String accountId,String type,

@RunAS("ADMIN") @RolesAllowed("CSR") public void cancelBid(Bid bid, Item item) {...}

You should use this annotation sparingly since like the @PermitAll annotation, it can open up security holes you might not have foreseen. As you can see, declarative security gives you access to a powerful authentication framework while staying mostly out of the way. The flexibility available to you through the relatively small number of relevant annotations should be apparent as well. If you have ever rolled out your own security or authentication system, one weakness might have crossed your mind already. The problem is that although you can authenticate a role using declarative security, what if you need to provide security settings specific to individuals, or even simple changes in method behavior based on the current Principal s role This is where programmatic EJB security steps onto the stage.

The handleError() method looks up a session EJB that handles specific errors. For example, the following remote interface could expose error-handling functionality to an entire EJB application:

In effect, programmatic security provides direct access to the Principal as well as a convenient means to check the Principal s role in the code. Both of these functions are made available through the EJB context. We ll begin exploring

programmatic security by redeveloping the bid-canceling scenario as a starting point. Listing 6.6 implements the scenario.

String description,BigDecimal balance,BigDecimal creditLine, BigDecimal beginBalance,java.util.Date beginBalanceTimeStamp, ArrayList customerIds) throws CreateException, MissingPrimaryKeyException { if ((accountId == null) || (accountId.trim().length() == 0)) { throw new MissingPrimaryKeyException( "ejbCreate: accountId arg is null or empty"); } this.accountId = accountId; this.type = type; this.description = description; this.balance = balance; this.creditLine = creditLine; this.beginBalance = beginBalance; this.beginBalanceTimeStamp = beginBalanceTimeStamp; this.customerIds = customerIds; try { insertRow(); } catch (Exception ex) { throw new EJBException("ejbCreate: " + ex.getMessage()); } return accountId; } public void AccountPOJO.ejbPostCreate(String accountId,String type, String description,BigDecimal balance,BigDecimal creditLine, BigDecimal beginBalance,java.util.Date beginBalanceTimeStamp, ArrayList customerIds) {} public Collection AccountPOJO.ejbFindByCustomerId( String customerId) throws FinderException { Collection result; try { result = selectByCustomerId(customerId); } catch (Exception ex) { throw new EJBException("ejbFindByCustomerId " + ex.getMessage()); } return result; } private void AccountPOJO.setExtraContext() { customerIds = new ArrayList(); } private void AccountPOJO.setEntityId(String id) { this.accountId = id;

public interface ErrorHandler extends javax.ejb.EJBObject { public void handleMessageDrivenError( String message, Message mg ); public void handleSessionError( Object errorMessage ); public void handleEntityError( Object errorMessage ); }