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A basic Hibernate client/server application may be designed with server-side units of work that span a single client request. When a request from the application user requires data access, a new unit of work is started. The unit of work ends when processing is complete and the response for the user is ready. This is also called the session-per-request strategy (you can replace the word session with persistence context whenever you read something like this, but it doesn t roll off the tongue as well). We already mentioned that Hibernate can support an implementation of a possibly long-running unit of work, called a conversation. We introduce the concept of conversations in the following sections as well as the fundamentals of object identity and when objects are considered equal which can impact how you think about and design conversations. Why is the concept of a conversation useful

<url-pattern>/services/*</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>AdminServlet</servlet-name> <url-pattern>/servlet/AdminServlet</url-pattern> </servlet-mapping>

For example, in web applications, you don t usually maintain a database transaction across a user interaction. Users take a long time to think about modifications, but, for scalability reasons, you must keep database transactions short and release database resources as soon as possible. You ll likely face this issue whenever you need to guide the user through several screens to complete a unit of work (from the user s perspective) for example, to fill an online form. In this common scenario, it s extremely useful to have the support of the persistence service, so you can implement such a conversation with a minimum of coding and best scalability. Two strategies are available to implement a conversation in a Hibernate or Java Persistence application: with detached objects or by extending a persistence context. Both have strength and weaknesses.

The detached object state and the already mentioned features of reattachment or merging are ways to implement a conversation. Objects are held in detached state during user think-time, and any modification of these objects is made persistent manually through reattachment or merging. This strategy is also called session-perrequest-with-detached-objects. You can see a graphical illustration of this conversation pattern in figure 9.2. A persistence context only spans the processing of a particular request, and the application manually reattaches and merges (and sometimes detaches) entity instances during the conversation. The alternative approach doesn t require manual reattachment or merging: With the session-per-conversation pattern, you extend a persistence context to span the whole unit of work (see figure 9.3). First we have a closer look at detached objects and the problem of identity you ll face when you implement a conversation with this strategy.

The configuration data you need to paste may well vary from the beta-2 release, the latest version at the time of writing, and the final version, so follow the process we have described to get the most up-to-date settings. 15.4.2 Adding the libraries The servlet configuration is not enough we need to add the Axis libraries. We do this by bringing all the JAR files from the xml-axis/lib directory into our WAR file. Rather than do this naively, we first filter out any files that we don t need, such as log4j-core.jar and crimson.jar. We move these into a subdirectory called not_to_server. This lets us use the pattern lib/**/*.jar to pull in all the Axis jar files needed client side, while lib/*.jar works as the server-side pattern. Including SOAP services in the build Everything is ready; it is time to extend our web application with the SOAP entry point. We do this with three property declarations and one new target:

As application developers, we identify an object using Java object identity (a==b). If an object changes state, is the Java identity guaranteed to be the same in the new state In a layered application, that may not be the case. In order to explore this, it s extremely important to understand the relationship between Java identity, a==b, and database identity, x.getId().equals( y.getId() ). Sometimes they re equivalent; sometimes they aren t. We refer to the conditions under which Java identity is equivalent to database identity as the scope of object identity. For this scope, there are three common choices:

<property name="soap.src.dir" location="soap"/> <property name="soap.classes.dir" location="${build.dir}/soap/classes"/> <property name="soap.jws.dir" location="${build.dir}/soap/jws"/> <target name="make-soap-api" depends="init"> <mkdir dir="${soap.classes.dir}"/> <javac srcdir="${soap.src.dir}" destdir="${soap.classes.dir}" includeAntRuntime="false" > <classpath> <path refid="compile.classpath"/> <pathelement location="${build.classes.dir}"/> </classpath> </javac> <copy todir="${soap.jws.dir}"> <fileset dir="${soap.src.dir}" includes="**/*.java"/> <mapper type="glob" from="*.java" to="*.jws"/>