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the bean class itself. As in our example, if you use the @WebService annotation in the bean class the endpoint interface will be generated automatically. We ll elaborate on the details of this annotation in the next section. We specified that the web service is a document-style web service by using the @javax.jws.SOAPBinding annotation c. We used the @javax.jws.WebMethod annotation to expose the addBid method in the web service d. You can use the @javax.jws.WebResult e and @javax.jws.WebParam f annotations to control the parameter names generated in the WSDL.

public abstract class PortfolioBean implements EntityBean { abstract public String getPortfolioName(); abstract public void setPortfolioName(String val); abstract public double getCashValue(); abstract public void setCashValue(double val); abstract public Owner getOwner(); abstract public void setOwner(Owner owner); //bean methods not shown }

A contract conflict occurs when one or several assertions are not verified. This conflict can arise for any reason, such as a hardware failure, the failure of a called routine, or a software bug that makes it impossible to satisfy the contract. In such cases, three strategies can be applied: Retrying: An alternative strategy is available. The contractors should restore the invariants and make another attempt using a different strategy. Organized panic: No alternative is available. The contractors must restore the invariants, terminate, and report failure to the user by triggering an exception. False alarm: It is possible to continue, maybe after some corrective measures are taken.

Using the @WebService annotation creates a stateless EJB to a web service. The rest of the annotations are optional.

In this section you ll learn how to use web services metadata annotations. We ll start with using the @WebService annotation to convert an EJB to a web service. You ll then see how to use the @SOAPBinding annotation to specify the web service style. You ll also learn about other annotations, such as @WebMethod, @WebParam, and @WebResult.

Finally, you must describe the entity relationship between the OwnerBean and AddressBean in the assembly descriptor of the ejb-jar.xml file (see listing 3.18). Notice that the bean deployment descriptors are normal CMP entity bean sections, except for missing one persistent field. The missing field is the one used to create the entity relationship.

The @WebService annotation is used on a bean or an interface class. If you use this annotation on the bean class, the annotation processor or the EJB container will generate the interface for you. If you already have a bean interface, then you can mark the @WebService annotation on the interface and the bean class will look like this:

One of the key mechanisms of OOP is inheritance. When inheritance is used, obligations are also inherited, and the subclasses can modify the inherited contracts. To ensure that the

@WebService public interface PlaceBidWS { public Long addBid(String bidderId, Long itemId, Double bidPrice); } @Stateless(name = "PlaceBid") public class PlaceBidBean implements PlaceBidWS, PlaceBid { ... }

<ejb-jar> <enterprise-beans> <entity> <ejb-name>OwnerEJB</ejb-name> <local-home>cascadeDelete.OwnerHome</local-home> <local>cascadeDelete.Owner</local> <ejb-class>cascadeDelete.OwnerBean</ejb-class> <persistence-type>Container</persistence-type> <prim-key-class>java.lang.String</prim-key-class> <reentrant>False</reentrant> <cmp-version>2.x</cmp-version> <abstract-schema-name>OwnerBean</abstract-schema-name> <cmp-field> <field-name>ownerName</field-name> Lists persistent </cmp-field> fields of the <cmp-field> OwnerBean <field-name>lastAccess</field-name> </cmp-field>

If you use the @WebService annotation on the interface, then all public methods on the web service endpoint will be exposed in the web service. In our example we have only one method (addBid), and it will be exposed in the web service. A careful look at the code reveals that the @WebService endpoint interface looks similar to the remote interface. You might be tempted to mark the same interface as both a web service and a remote interface, like this:

@WebService @Remote public interface PlaceBid { public Long addBid(String bidderId, Long itemId, Double bidPrice); }

subclasses offer at least the same level of service as the superclasses, these modifications must follow certain rules: For preconditions, subclasses keep the same conditions or make them less restrictive. For postconditions, subclasses keep the same conditions or make them more restrictive. For class invariants, the invariants of a superclass are automatically part of the invariants of the subclasses. For internal invariants, the invariants of a superclass are kept identical only if the subclass does not redefine the method that the invariant is defined about.