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The most rigorous approach to building a web service is to create a WSDL specification of the interface, and perhaps an XSD description of all the datatypes. SOAP has its own syntax for declaring simple datatypes, but because XSD is more standardized, we encourage you to follow the XSD path. The other aspect of rigorous service development is to implement the service in a Java file, and not as a JWS page, which lets you bypass the copy-based renaming of Java source to JWS pages. The Java files just live in the same source tree as the rest of the web application, and are validated by the build-time <javac> compile of the main source tree. We don t go into detail on this more rigorous server-side development process. We could probably write a whole new book on how to build, test, and deploy web services with Ant, and get into much more detail into how SOAP and Axis work. What we can do is provide some directions for you to follow, if you want to explore this problem. One of the best starting points is actually the test server classes you can find in the Axis CVS tree; these are the most up-to-date examples of service generation.

Flushing the Session state to the database at the end of a unit of work is required in order to make the changes durable and is the common case Note that automatic flushing when a transaction is committed is a feature of the Hibernate API! Committing a transaction with the JDBC API doesn t trigger a flush Hibernate doesn t flush before every query If changes are held in memory that would affect the results of the query, Hibernate synchronizes first by default You can control this behavior by explicitly setting the Hibernate FlushMode via a call to sessionsetFlushMode() The default flush mode is FlushModeAUTO and enables the behavior described previously If you chose FlushModeCOMMIT, the persistence context isn t flushed before query execution (it s flushed only when you call Transactioncommit() or Sessionflush() manually).

To turn a Java class into a SOAP endpoint, you need to provide a Web Service Deployment Descriptor (WSDD) that tells the Axis run time what the attributes of the service are In the descriptor, you must name the service and the class that implements it, and which class methods are to be accessible via SOAP You can also register handlers for SOAP headers These are the SOAP equivalent of headers in an HTTP request: little fragments of information that the SOAP endpoint or other server-side code can use to implement features such as security and sessions You could use HTTP headers instead, but the SOAP header model integrates better with an XML-based communication system, and works when you use alternative transports such as email.

This setting may expose you to stale data: Modifications you make to managed objects only in memory may conflict with the results of the query By selecting FlushModeMANUAL, you may specify that only explicit calls to flush() result in synchronization of managed state with the database Controlling the FlushMode of a persistence context will be necessary later in the book, when we extend the context to span a conversation Repeated flushing of the persistence context is often a source for performance issues, because all dirty objects in the persistence context have to be detected at flush-time A common cause is a particular unit-of-work pattern that repeats a query-modify-query-modify sequence many times Every modification leads to a flush and a dirty check of all persistent objects, before each query A FlushModeCOMMIT may be appropriate in this situation.