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public void businessMethod() throws EJBException { //perform important logic boolean returnValue = performBusinessFunction(); try { //evaluate success of logic if( returnValue ){ //do something else } else{ //force immediate rollback throw new SystemException( "Condition failed, rolling back"); } }catch( CustomException ce ) { throw new EJBException( ce ); } }

request = aRequest; } public void HttpRequestContext.setHttpRequest(HttpServletRequest aRequest) { request = aRequest; } public HttpServletRequest HttpRequestContext.getHttpRequest() { return request; } public String HttpRequestContext.getAuthType() { return getHttpRequest().getAuthType(); } // same principle... public String HttpRequestContext.getCharacterEncoding() {...} public int HttpRequestContext.getContentLength() {...} public String HttpRequestContext.getContentType() {...} public String HttpRequestContext.getContextPath() {...} public String HttpRequestContext.getPathInfo() {...} public String HttpRequestContext.getPathTranslated() {...} public String HttpRequestContext.getProtocol(){...} public String HttpRequestContext.getQueryString(){...} public String HttpRequestContext.getRemoteAddress(){...} public String HttpRequestContext.getRemoteHost(){...} public String HttpRequestContext.getRemoteUser(){...} public String HttpRequestContext.getRequestedSessionID(){...} public String HttpRequestContext.getRequestURI(){...} public String HttpRequestContext.getScheme(){...} public String HttpRequestContext.getServerName(){...} public String HttpRequestContext.getServletPath(){...} public Object HttpRequestContext .getSessionAttribute(String aAttribute) {...} public void HttpRequestContext.setSessionAttribute(String attr,Object val) {...} public Object HttpRequestContext.getRequestAttribute(String aAttribute){...} public void HttpRequestContext.setRequestAttribute(String attr,Object val) {...} // login public void LoginRequestContext.setHttpRequest(HttpServletRequest aRequest) { loginRequest = aRequest; } public HttpServletRequest LoginRequestContext.getHttpRequest() { return loginRequest; }

Summary

If you have used EJB 2, you might be familiar with the container-managed relationship (CMR) feature of entity beans with bidirectional relationships. This feature monitored changes on either side of the relationship and updated the other side automatically. CMR is not supported in this version because entities can possibly be used outside of containers. However, mimicking this feature is not too hard using a few extra lines of code. Let us take the User-BillingInfo one-to-one relationship, for example. The code for changing the BillingInfo object for a User and making sure both sides of the relationship are still accurate would look like this:

Transactions are automatically rolled back if a system exception is thrown at any time during the transaction. System exceptions are the RuntimeException and any of its subclasses. Because system exceptions are runtime exceptions, they do not need to be declared in the method declaration. If a system exception is thrown from within the method that started the transaction, the transaction is rolled back. If a client started the transaction, the client s transaction is marked for rollback. Using system exceptions to force rollbacks does have certain, important side effects. When the container catches a system exception, it rolls back the transaction, logs the exception, and discards the EJB that originated the exception. For stateless session and entity beans, losing a bean instance is not that important, since a new one will be identical in every way for the client. However, losing a reference to a stateful bean will cause a client to lose the state it might have accumulated in that bean.

user.setBilling(billing); billing.setUser(user);

public void LoginRequestContext .initialize(HttpServletRequest aRequest) { loginRequest = aRequest; setUserName(aRequest.getParameter(USER_PARAM)); setUserPassword(aRequest.getParameter(PASSWORD_PARAM)); } // subscription public void SubscriptionContext.setHttpRequest( HttpServletRequest aRequest) { subscriptionRequest = aRequest; } public HttpServletRequest SubscriptionContext.getHttpRequest() { return subscriptionRequest; } public void SubscriptionContext .initialize(HttpServletRequest aRequest) { subscriptionRequest = aRequest; setFirstName(aRequest.getParameter(FIRST_PARAM)); setLastName(aRequest.getParameter(LAST_PARAM)); setEmail(aRequest.getParameter(EMAIL_PARAM)); } // other requests [...] }

7.4 Summary

In this chapter, we discussed basic domain modeling concepts: entities, relationships, and how to define them using JPA. The lightweight API makes creating rich, elegant, object-oriented domain models a simple matter of applying annotations or deployment descriptor settings to plain Java objects. The even greater departure from the heavyweight, framework code laden approach of EJB 2 is the fact that the new persistence API can be separated altogether from the container, as you ll see in upcoming chapters. It is interesting to note that the API doesn t directly control relationship multiplicity. In the case of one-to-one and many-to-one relationships, the optional element somewhat specifies the multiplicity of the relationship. However, in the case of one-to-many and many-to-many relationships, the API does not enforce multiplicity at all. It is instead the responsibility of the programmer to control the size of the collection holding entity references (java.util.Set objects in our examples) and therefore control multiplicity. In chapter 8 we move on to the next step in building the ActionBazaar persistence layer and show you how to map the entities and relationships we created to the database using object-relational mapping.

5.3 Rolling back the current transaction 5.8 Managing EJB state at transaction boundaries 5.10 Managing EJB state after a rollback