Java RMI, Enterprise JavaBeans provides a far simpler and more productive platform on version , is covered by this, the 3rd edition of O'Reilly's EJB book. O'Reilly Media, Inc. Enterprise JavaBeans , Sixth Edition, the image of a wallaby and joey, and related trade dress are .. No more manual database connections. JBoss codebase, popular forums, and the upcoming EJB specification. O'Reilly Media, Inc. Enterprise JavaBeans™, Fifth Edition, the .. For example: " Enterprise JavaBeans , Fifth Edition, by Bill Burke and.
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If you're up on the latest Java technologies, then you know that Enterprise JavaBeans (EJB) is the hottest news in Java this year. In fact, EJB is being . Written by the developers of the JBoss EJB implementation, this book Use examples with either the JBossAS, OpenEJB, or GlassFish v3 EJB Containers. This repo is designed to synchronize materials between my computers. In this case, I use GitHub just like Dropbox. - slavaburdun/MyMaterials.
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Down sides: - lot of tiny errors; while they are not deal breaker, it'd be nice if ALL the code presented was truly functional. It's usually little things that can be solved by googling the topic like forgot to implement Serializable, a variable's name mispelled, etc.
No CD comes witht he book thumb down and following the link provided in the book takes you to the JBoss source, rather than the examples's source. The web service was the only chapter I couldn't make the example work. The theory part of the book is general in nature, specifying which behaviors are specs dictated and which are vendor implementation dependant. The practice part is JBoss specific, which is one of the main reasons I bought this book.
This book explains and demonstrates the fundamentals of the EJB 3. Although EJB makes application development much simpler, it is still a complex technology that requires a great deal of time and study to master. This book provides a straightforward, no-nonsense explanation of the underlying technology, Java classes and interfaces, the component model, and the runtime behavior of EJB.
It does not include material on previous versions of the specification, however. Although this book focuses on the fundamentals, it's not an easy read. EJB is an extremely complex and ambitious enterprise technology. Before reading this book, you should be fluent in the Java language and have some practical experience developing business solutions.
Experience with distributed object systems is not required, but you will need some experience with JDBC to follow the examples in this book. I review this book in the context of its table of contents: 1. Introduction - Defines component transaction monitors and explains how they form the underlying technology of the EJB component model. Architectural Overview - Defines the architecture of the EJB component model and examines the differences between the three basic types of enterprise beans: entity beans, session beans, and message-driven beans.
Developing Your First Beans - Walks you through the development of some simple enterprise and entity beans. Persistence: EntityManager - Explains how entity beans interact with the new entity manager service.
This chapter focuses on the details of the persistence service and how it can be accessed within Java EE and with regular Java programs that run outside of a Java EE environment.
Mapping Persistent Objects - Defines the basic relational database mapping provided by the Java Persistence specification. This chapter takes a thorough look at the process of developing entity beans--specifically, mapping them to a relational database. Entity Relationships - A continuation of chapter six that expands your understanding of persistence and complex bean-to-bean relationships. Entity Inheritance - Discusses entity bean inheritance and how an object hierarchy can be mapped to a relational database.
This code shares a single address between the Home Address and Billing Address relationships: Test71Bean, in the test71b method. Examine the code for this example. The code also creates an instance of a Customer EJB: Test71Bean, in the test71c method. First, the test code locates the Customer home interface through JNDI, then finds the Customer that needs new phone numbers: Part 2 The example programs in Exercise 7.
Initialize the Database No database initialization is needed; JBoss will create the needed tables at bean deployment. Examine and Run the Client Applications This exercise uses six example programs to demonstrate the various relationships described in the corresponding chapter of the EJB book. Note that you can rerun any of these examples as many times as you like because they clean up after themselves by removing all the entities they create.
Test72Bean, in the test72a method. First, this code creates the relationships described in the top half of the figure. This relationship change is illustrated in the bottom half of Figure Test72Bean, in the test72b method.
JBoss Workbook for Enterprise JavaBeans, 3rd Edition 63 First, this code creates the relationships described in the top half of the figure. Those relationships actually move from A to B. Afterward, Cruise A and Reservations no longer have any Cruise-Reservation relationships, as you see in the bottom half of Figure Test72Bean, in the test72c method.
The result of this action can be seen in the bottom half of Figure Test72Bean, in the test72d method. First two sets of customers are created: They now have a reservation for both Cruise A and Cruise B.
The bottom half of Figure illustrates this result: Test72Bean, in the test72e method. First, four sets of customers are created: Test72Bean, in the test72f method. First four sets of cabins are created: It does this with an example Customer bean and some other beans related to it.
The example code is pretty straightforward and needs no explanation. If you think you need to, review Exercise 6. To initialize all the tables in this example, though, you must perform the Ant task run. Each Test81Bean method is invoked by a small, simple client application. All they do is delegate to the ejbSelect methods they wrap. As you can see, they are extremely useful in exposing private ejbSelect methods so that they can be invoked by test programs or business logic.
All the workbook example programs for Chapter 8 use the custom home methods for this purpose. To run it invoke the Ant task run. Sacha has bad credit! For an explanation of the details of the tested queries below, please refer to the Simple Queries with Paths section of Chapter 8 of that book.
Test81Bean, in the test81b method. Again, these ejbSelect methods are wrapped by custom home methods. For an explanation of the details of the tested queries below, please refer to the IN Operator section of Chapter 8 of that book.
Test81Bean, in the test81c method. The test programs of this section demonstrate most of the example queries provided in Chapter 8 of the EJB book.
If you think you need to, review Chapter 6. Each Test82Bean method is invoked by a small, simple client application. Test82Bean, in the test82a method. Test82Bean, in the test82b method. Customer finder method: Ship finder method: Test82Bean, in the test82c method.
As in previous sections, the ejbSelect query is wrapped in a custom home method. Customer ejbSelect method: Cruise finder method: Test82Bean, in the test82d method. Reservation finder method: Test82Bean, in the test82e method. Test82Bean, in the test82f method.
The code uses two Customer EJB finder methods. One queries for all customers living in Georgia or Massachusetts. The other queries for all customers that do not live in these two states.
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Test82Bean, in the test82g method. There are two Customer EJB finder methods. One selects all customers that have a null home address. The other selects all customers that do not have a null address. Test82Bean, in the test82h method. One returns all the Cruises that do not have Reservations. The other method returns all Cruises that have Reservations. Test82Bean, in the test82i method. Test82Bean, in the test82j method. Test82Bean, in the test82k method. One Customer EJB finder method demonstrates the use of a couple of functional expressions.
First, you must declare an ejbSelectGeneric method that will invoke your dynamic queries and an ejbHome wrapper method so that the test program can invoke it. Test82Bean, in the test82Dynamic method.
Please review the advanced CMP 2.
You will also build a client application to test this Ship BMP bean. Initialize the Database As in the CMP examples, the state of the entity beans will be stored in the database that is embedded in JBoss.
The bean is in fact the only one that knows how to load, store, remove, and find data. The persistence mapping is not described in a configuration file, but embedded in the bean code instead. One consequence is that the database environment for BMP must always be built explicitly.
As an analogy, consider the static methods of a class: This first part of the deployment descriptor essentially tells the container that the Ship bean: The second part of the deployment descriptor declares the transactional and security attributes of the Ship bean: If no transaction is active when a method invocation enters the container, a new one will be started.
In entity beans, transactions are always managed by the container and never directly by the bean. Thus, all work done on transactional resources, such as databases, will implicitly be part of the transactional context of the container. While this shortcut is generally useful for quick prototyping, it will not satisfy more complex deployment situations. Furthermore, using a JBoss-specific deployment descriptor enables you to fine-tune a container for a particular situation.
This mapping was a design decision made by the JBoss container developers and has not been dictated by the EJB specification: When you write a JBoss-specific deployment descriptor, you have three options: JBoss will use the default configuration found in standardjboss.
The default settings are not used at all. JBoss will configure the container only as you specify in jboss. JBoss loads the default settings from the existing configuration found in standardjboss.
This solution allows you to make minor modifications to the default container with minimal writing in your deployment descriptor. The Ship bean uses the last option, to test its behavior with different commit options. The bean expects to find a data source bound to the java: Then jboss. In any default JBoss installation, java: You can see that, depending on the first argument found on the command line, either CreateDB or DropDB, the client application will call the corresponding home method.
The client application first creates a new Ship and calls some of its remote methods to set its tonnage and capacity. Then it finds the bean again by calling findByPrimaryKey , and compares the bean references for equality.
Because they represent the same bean instance, they must be equal. Creating the database table 2. Testing the bean possibly many times 3.
Dropping the database table For each of these steps, a different Ant target is available. Once this step has been performed, the actual testing of the BMP bean can take place.
Doing so will remove all database files and allow you to start fresh. The client does not implicitly start any transaction in its code. The transaction starts only when the invocation enters the bean container and commits when the invocation leaves the container.
Thus, when the client performs three calls, each one is executed in its own transactional context. Look at the implications for the BMP bean: Consequently, these three lines of code cause the bean to be stored three times.
Worst of all, after any method invocation, the container has no way of knowing whether the state of the bean has been modified, and thus, to be on the safe side, it triggers storage of the bean.. Given that there is no read-only method concept in EJBs, calls to get methods also trigger calls to ejbStore: You can see that transaction boundaries i. The commit option determines how an entity bean container can make use of its cache.
Remember from the container configuration section that the bean is currently using commit option A. JBoss Workbook for Enterprise JavaBeans, 3rd Edition If you select commit option A, the entity bean container is allowed to cache any bean that it has loaded.
Next time an invocation targets a bean that is already in the application server cache 1 , the container will not have to make a costly database access call to load it again. If you select commit option B or C, the entity bean container is allowed to cache a bean only if it loads that bean during the lifetime of the currently running transaction.
Once the transaction commits or rolls back, the container must remove the bean from the cache. The next time an invocation targets the bean, the container will have to reload it from the database.
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That extra reloading is costly — but you must use B or C 2 whenever the data represented by the container can also be modified by other means. Direct database access calls through a console, for example, will cause the container cache to become unsychronized with the database, leading to incorrect computations and other dire results.
To circumvent these limitations, JBoss provides some proprietary optimizations: See the JBoss web site for more information.
The bean instance can be cached across transactions, but a configurable timeout value indicates when this cached data is stale and must be reloaded from the database. This option is very useful when you want some of the efficiency of commit option A, but want cached entities to be updated periodically to reflect modifications by an external system.
Consequently, you can define for each EJB the commit option that best fits its specific environment. While database caches are critical to performance, application server caches can improve it even further.
This distinction allows you to use commit option B for very specific container optimizations such as checking whether the data has really been modified in the database and reusing the instance if no modification has occurred, instead of reloading the whole state. JBoss Workbook for Enterprise JavaBeans, 3rd Edition After this introduction to what commit options are, it becomes possible to guess that the container is currently using commit option A without looking at its configuration.
Two pieces of evidence lead us to this conclusion: The container first checks whether the cache already contains an instance for the given primary key.
Note that only direct access to a given bean using its remote reference or findByPrimaryKey calls can be resolved in cache. All other queries findAll , findByCapacity , etc.
To see how different commit options lead to different behavior, in jboss. Then run the tests again. Possible Optimizations As you have seen during the execution of the client application, the Ship bean performs many ejbLoad and ejbStore operations. There are two reasons behind this behavior: You can reduce the number of transactions in several ways: BMP code optimization is a wide topic.
Here are some tricks that are frequently used: Set it to true each time the state of the bean changes in set methods, for example. In the implementation of ejbStore , perform the actual database call only if isModified is true. Think about the impact on the test application.
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All the ejbStore calls resulting from invocations to get methods will detect that no data has been modified and will not try to synchronize with the database.
This tactic is especially useful for beans with lots of fields, or with fields that contain large data. Note that any decent CMP engine performs many of these optimizations automatically, by default. You will also build a client application to test this ProcessPayment bean.
The bean will insert the payment information data directly into the database, without using an intermediary entity bean. The present exercise leaves these EJBs unchanged, and focuses on the ProcessPayment stateless session bean. The ProcessPayment bean has a very simple remote interface. It offers options to process a payment by check, cash, or credit card. Each possibility is handled by a different method: The other two are more interesting. To the EJB container, this choice of parameter type makes no difference at all.
The second parameter conveys the details of the transaction in a data object whose type reflects the form of payment. A data object is a Serializable object that a client and a remote server can pass by value back and forth.
Most of the time it is a simple data container, with minimal behavior. Each remote method first performs validity tests appropriate to the type of payment. Eventually all of them call the same private method: For example, byCredit implements this logic thus: Date card. If not, it simply delegates to process the chore of inserting the payment information into the database. Note that some parameters passed to process are meaningless. For example, the fourth parameter represents the check bar code, which means nothing in a credit card payment, so byCredit passes a dummy value.
Note that the returned value is not significant. The method either returns true or throws an application exception, so its return type could as easily be void. These settings ensure that the container will automatically manage the transactions and enlist any transactional resources the bean uses. The descriptor contains a reference to a data source it will use to store the payments. You use this data source the same way you did in the BMP example in chapter Integer and a default value It only maps the data source to the embedded database in JBoss: Use the createdb Ant target: Then run the Ant build target clean.
This will remove all database files and allow you to start fresh. The PaymentException has not been raised! Check number is too low.The quick Download da base de dados de empresas portuguesas atualizada diariamente An entity bean can manage its own persistence Bean managed persistence or can delegate this function to its EJB Container Container managed persistence. CabinHomeRemote; import com. The name of the sub-directory represents the name of the configuration.
In any default JBoss installation, java: