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This means we have completed our example web service, from integration with our application all the way to our client, including both configuration checks to probe for Axis, and client-side functional tests to verify that the service does what we expect. We are now very close to being able to declare the service ready for production. One missing item is the extra server-side functionality to retrieve the indexed files; we will leave this until version 2.0. What we do have to do for version 1.0 is verify that our service is interoperable.

<key column="ITEM_ID" not-null="true"/> <composite-element class="Bid"> <parent name="item"/> <property .../> ... </composite-element> </idbag> </class>

The separate mapping for Bid is no longer needed. If you really want to make this a one-to-many entity association, Hibernate offers another convenience option you may be interested in. Enabling orphan deletion The cascading option we explain now is somewhat difficult to understand. If you followed the discussion in the previous section, you should be prepared. Imagine you want to delete a Bid from the database. Note that you aren t deleting the parent (the Item) in this case. The goal is to remove a row in the BID table. Look at this code:

Interoperability, or interop, as it is often called, is an ongoing issue with SOAP. The developers of SOAP toolkits, the SOAPBuilders, all work on interoperability tests to verify that foundational datatypes such as strings, integers, Booleans, arrays, and base64 encoded binary data can all be exchanged between clients and servers. This is all very well, but it is not enough; complex types are not yet standardized. Consider the HashTable class: Java implements java.util.HashTable and .NET has its own implementation in System.Collections.HashTable. You can return one of these from a service you implement in your language of choice:

anItem.getBids().remove(aBid);

public HashTable getEmptyHashTable() { return new HashTable(); }

If the collection has the Bid mapped as a collection of components, as in the previous section, this code triggers several operations:

A client written to use the same toolkit as the service will be able to invoke this SOAP method and get a hashtable back. A client written in another toolkit, or in a different language, will not be able to handle this. If we were writing our server API by coding a WSDL file first and then by writing entry points that implemented this WSDL, we would probably notice that there is no easy way to describe a hashtable; consequently, we would define a clean name-value pair schema to represent it. Because we are developing web services the lazy way, by writing the methods and letting the run time do the WSDL generation, we do suffer from the hashtable problem. There is no warning at build time that the datatypes we are using in our service are not usable by other SOAP libraries, which means that we may only find out that we have an interop problem some time after we have deployed our service. We need to rectify this.

The aBid instance is removed from the collection Item.bids. Because Bid is mapped as a value type, and no other object can hold a reference to the aBid instance, the row representing this bid is deleted from the BID table by Hibernate.

Applying Ant to a project requires careful integration with the rest of the software development and build processes As it is only a build tool, and should not be dictating how to organize your software process, though it has certain preferences for the build process itself We have outlined the steps that we recommend for starting a new project using Ant, and for migrating an existing project to Ant We advise learning Ant with a new project until you are comfortable with the tool because migrating is a more difficult process Large projects are a challenge in their own right The core technique to cope with large projects and their complex build processes is to subdivide the projects and have a master build file in a parent directory that invokes the others using <ant>.

In other words, Hibernate assumes that aBid is an orphan if it s removed from its owning entity s collection. No other in-memory persistent object is holding a reference to it. No foreign key value that references this row can be present in the database. Obviously, you designed your object model and mapping this way by making the Bid class an embeddable component. However, what if Bid is mapped as an entity and the collection is a <one-tomany> The code changes to

anItem.getBids().remove(aBid); session.delete(aBid);