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Containers are a central theme in the J2EE architecture. Earlier in this chapter I talked about application infrastructure in terms of the plumbing and electricity that a house provides for its inhabitants. Containers are where those infrastructure services interface with, and provide a host for, application logic. In the same way that application developers can partition application logic into tiers of specific functionality, the designers of J2EE have partitioned the infrastructure logic into logical tiers. They have done the work of writing the application support infrastructure things that you d otherwise have to build yourself. These include things like security, transaction handling, naming, and resource location, and of course the guts of network communications that connect the client to the server. J2EE provides a set of interfaces that allow you to plug your application logic into that infrastructure and access those services. Those interface layers are the J2EE containers. Think of containers as playing a role much like a video gaming console that you plug game cartridges into. The gaming console provides a point of interface for the game, a suite of services that lets the game be accessed by the user and allows the game to interact with the user. The game cartridge itself needs only be concerned with itself it doesn t need to concern itself with how the game is displayed to the user, nor what sort of controller is being used, or even if the household electricity is 120VAC or 220VAC the console provides a container that abstracts all of that stuff out for the game, allowing the game programmer to focus solely on the game and not the infrastructure:



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</properties> </persistence-unit> </persistence>' In a Java EE environment, a Java EE container is able to manage the entity manager for you and inject it into your EJB components directly. But when you use JPA outside of a Java EE container (e.g., in a Java SE application), you have to create and maintain the entity manager by yourself. Now let s implement the CourseDao interface in the jpa subpackage using JPA in a Java SE application. Before you call JPA for object persistence, you have to initialize an entity manager factory. The purpose of an entity manager factory is to produce entity managers for you to persist your objects.

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jar and jboss-archive-browsing.jar (located in the lib/hibernate directory of the Spring installation) in your classpath. As Hibernate EntityManager depends on Javassist (http://www.jboss.org/ javassist/), you also have to include javassist.jar in your classpath. If you have Hibernate installed, you should find it in the lib directory of the Hibernate installation. Otherwise, you have to download it from its web site.

</tr> <tr> <td> <input type="submit" value="Submit Rating"> </td> </tr> </table> </form> <% } else { %> No stock information found <% } %> </body> </html>

Now, we need a servlet to process the request to add a stock rating from an analyst. After adding the rating, the servlet will send the request back to the RatingsForm.jsp to display the new model of the data. This servlet needs to be saved to the /web directory:

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including the shortest edge can be made smaller, so the minimum spanning tree must include the shortest edge (As you ll see, this is the basic idea behind Kruskal s algorithm) What if we consider all the edges incident at a single node can we draw any conclusions then Take a look at b, for example By the definition of spanning trees, we must connect b to the rest somehow, which means we must include either (b, d) or (b, a) Again, it seems tempting to choose the shortest of the two And once again, the greedy choice turns out to be very sensible Once again, we prove that the alternative is inferior using a proof by contradiction: assume that it was better to use (b, a) We d build our minimum spanning tree with (b, a) included.

package com.apress.springrecipes.course.jpa; ... import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.EntityTransaction; import javax.persistence.Persistence; import javax.persistence.Query; public class JpaCourseDao implements CourseDao { private EntityManagerFactory entityManagerFactory; public JpaCourseDao() { entityManagerFactory = Persistence.createEntityManagerFactory("course"); } public void store(Course course) { EntityManager manager = entityManagerFactory.createEntityManager(); EntityTransaction tx = manager.getTransaction(); try { tx.begin(); manager.merge(course); tx.commit(); } catch (RuntimeException e) {

package web; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; public class AddRating extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) { try { String analyst = request.getParameter("analysts"); String ticker = request.getParameter("stocks"); String rating = request.getParameter("ratings"); Vector v = new Vector(); v.add(analyst); v.add(ticker); v.add(rating); ArrayList ratings = (ArrayList)request.getAttribute("data"); ratings.add(v); ArrayList unratedStocks = (ArrayList)request.getAttribute("unrated"); unratedStocks.remove(unratedStocks.indexOf(ticker)); ServletContext context = getServletContext(); RequestDispatcher dispatcher = context.getNamedDispatcher("RatingsForm"); dispatcher.forward(request, response); } catch (Exception e) { log("Exception in AddRating.doPost()", e); } } }

Create a simple Error.jsp page to handle bad request URLs. If you are using Tomcat stand alone, you need to change the port number shown below from 1024 to 8080. Save this page in the root directory of the web application:

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