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Before object orientation became popular, programs were usually written in procedural languages and often employed relational databases to hold the data. Because of the strengths and maturity of relational database technology, it is now often advantageous to develop object-oriented applications that use relational databases. The problem with this approach is that there is an inherent difference between object-oriented and relational database technologies, making it less than natural for them to coexist in one application. The use of entity beans is one way to get the best of both of these worlds, because: Entity beans are objects, and they can be designed using object-oriented principles and utilized in applications as objects. The data in these entity bean objects are usually persisted in relational databases. All of the benefits of relational technologies, including maturity of products, speed, reliability, ability to recover, and ease of querying, can be leveraged.



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@BeforeMethod public void init() { interestCalculator = new SimpleInterestCalculator(); interestCalculator.setRate(0.05); } @DataProvider(name = "legal") public Object[][] createLegalInterestParameters() { return new Object[][] { new Object[] { 10000, 2, 1000.0 } }; } @DataProvider(name = "illegal") public Object[][] createIllegalInterestParameters() { return new Object[][] {new Object[] { -10000, 2 }, new Object[] { 10000, -2 }, new Object[] { -10000, -2 }}; } @Test(dataProvider = "legal") public void calculate(double amount, double year, double result) { double interest = interestCalculator.calculate(amount, year); assertEquals(interest, result); } @Test( dataProvider = "illegal", expectedExceptions = IllegalArgumentException.class) public void illegalCalculate(double amount, double year) { interestCalculator.calculate(amount, year); } } If you run the preceding test with TestNG, the calculate() method will be executed once, while the illegalCalculate() method will be executed three times, as there are three data sets returned by the illegal data provider.





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In a typical EJB scenario, when a session bean needs to access data it calls the methods of an entity bean. Entity beans represent the persistent data in an EJB application. For example, an application for an educational institution might have an entity bean named Student that has one instance for every student that is enrolled in an institution. Entity beans, often backed by a relational database, read and write to tables in the database. Because of this, they provide an object-oriented abstraction to a relational database. Entity beans will be covered in detail in the next chapter.

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This problem is compounded if you re comparing more than two implementations The number of pairs to compare increases quadratically with the number of versions (as explained in 3), drastically increasing the chance that at least two of the versions will appear freakishly different, just by chance (This is what s called the problem of multiple comparisons) There are statistical solutions to this problem, but the easiest practical way around it is to repeat the experiment with the two implementations in question Maybe even a couple of times Do they still look different Second, there are issues when comparing averages At the very least, you should stick to comparing averages of actual timings A common practice to get more meaningful numbers when performing timing experiments is to normalize the running time of each program, dividing it by the running time of some standard, simple algorithm.

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A common testing skill is to test each module of your application in isolation and then test them in combination. You would like to apply this skill in testing your Java applications.

When an EJB-based application needs to receive asynchronous messages from other systems, it can leverage the power and convenience of message-driven beans. Asynchronous messages between systems can be analogous to the events that are fired from a UI component to an event handler in the same JVM. One example application that could use message-driven beans is in the business to business (B2B) domain: a wholesaler could have an EJB application that uses message-driven beans to listen for purchase orders issued electronically from retailers.

This can indeed be useful but can in some cases make your results less than meaningful See the paper How not to lie with statistics: The correct way to summarize benchmark results by Fleming and Wallace for a few pointers For some other perspectives, you could read Bast and Weber s Don t compare averages, or the more recent paper by Citron et al, The harmonic or geometric mean: does it really matter Third, your conclusions may not generalize Similar experiments run on other problem instances or other hardware, for example, might yield different results If others are to interpret or reproduce your experiments, it s important that you thoroughly document how you performed them Tip 6: Be careful when drawing conclusions about asymptotics from experiments.

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