Deploying the Applications in VS .NET

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As the PizzaUnitsEB bean is of type BMP, only two files are needed for the deployment descriptor: ejb-jar xml and weblogic-ejb- jar xml The third file, weblogic-cmp-rdbms- jar xml, contains information about the container managed persistence, which is not used by this entity bean The following entries are in the file weblogic-ejb- jar xml:
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<weblogic-ejb-jar> <weblogic-enterprise-bean> <ejb-name>jsw c05 PizzaUnitsEB</ejb-name> <caching-descriptor> <max-beans-in-cache>100</max-beans-in-cache> < idle -timeout-seconds>5</ idle- timeout- seconds > </caching-descriptor> <persistence-descriptor> <delay-updates-until-end-of-tx>false< /delay-updates -until -end-of-tx> </persistence-descriptor> < jndi-name>jswc05 PizzaUnitsEB</ jndi-name> </weblogic-enterprise-bean> </weblogic-ejb-jar>
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Running the Entity Beans
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As in the previous chapter, a GNUmakef ile is provided to compile, deploy, and install the code for this chapter Specific targets for the new entity EJBs are defined (PizzaUnitsEB, OrderMasterEB, and OrderDetailEB) With these examples EJBs call each other, and so it is very important to understand the dependencies between them The order in which they are deployed is critical For the example in this chapter the order of dependency is (from the weblogic properties file):
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weblogicejbdeploy=\ c:/wlsbook/srv/c05-srv/ejb/PizzaUnitsEBBeanjar,\ c:/wlsbook/srv/c05-srv/ejb/OrderMasterEBBeanjar,\ c:/wlsbook/srv/c05-srv/ejb/OrderDetailEBBeanjar,\ c:/wlsbook/srv/c05-srv/ejb/PizzaServicesSLBeanjar,\ c:/wlsbook/srv/c05-srv/ejb/OrderServicesSLBeanjar,\ c:/wlsbook/srv/c05-srv/ejb/OutletServicesSLBeanjar,\ c:/wlsbook/srv/c05-srv/ejb/OrderSFBeanjar
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5
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This is more or less straightforward It becomes a little more complicated when you have circular dependencies This is, when bean A calls bean B, which then uses bean A For direct or indirect circular dependencies the solution is to place the beans involved in the same JAR file In any case, it is highly recommended that you try to use JAR files as much as you can They do make things a lot easier, more organized, and cleaner, and most important, allow for hot deployment
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The Controversy
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After developing the code for this chapter, the Wonder Troops find themselves embroiled in a pretty lively controversy about the usage of entity beans On one side of the table sits Mr Senior Developer and the majority of developers They think that: Q Q Entity beans should only be used for queries when the enumeration or collection returned by a finder method is not more than a handful of records Functions such as a listing of all the customers of Pizza2Go, which is bound to return a large number of records, should use JDBC directly The argument is based on the fact that a large number of bean instances in the container will substantially diminish the performance of the server They feel more comfortable using entity beans for updates and inserts to the persistence store, as well as for simple retrievals of information
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The opposition consists of Mrs Chief Architect and a few of the developers Their view is that most of the access to the persistence store should be done solely through entity beans, except for queries that return a very large number of records Direct JDBC access is the big no-no The productivity gains possible during the development cycle through using entity beans far out-weigh any possible performance degradation, in their opinion The situation is reminiscent of historic fights where Assembler was pitted against FORTRAN or COBOL - execution efficiency against development and maintenance productivity However Mrs Chief Architect does not ignore the fact that this technology is relatively new and that there might be limitations on the implementations that are available today This could potentially be the main performance issue Nobody seems to have a clear answer to the situation Happily, for the parties involved, the performance of entity beans is one of the items that will be measured in 11, where the load capacity tests will hopefully resolve the controversy There is also a school of thought that container- and bean-managed beans should not be mixed in one system, as it makes design decisions too complex and maintenance too difficult However, not enough work has yet been done with EJBs to know which approach is going to be the best
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The EJB 20 specification also introduces some significant changes, notably a much more sophisticated specification for beans using container-managed persistence, and it remains to be seen how much these will impact on EJB design Since this book is concerned with proven development techniques, this has not been addressed here
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