java ean 128

java barcode ean 128

java barcode ean 128

java gs1 128

java gs1-128

java gs1 128,

java barcode ean 128,
java gs1-128,
java barcode ean 128,
java ean 128,

java ean 128,
java ean 128,
java barcode ean 128,
java gs1 128,
java barcode ean 128,

java gs1-128,
java gs1-128,
java barcode ean 128,
java barcode ean 128,
java barcode ean 128,
java gs1-128,
java gs1 128,
java gs1-128,
java ean 128,
java ean 128,
java gs1-128,
java gs1 128,
java gs1-128,
java gs1 128,
java gs1-128,
java gs1-128,
java gs1 128,
java gs1-128,
java gs1-128,
java gs1 128,
java gs1-128,

java barcode ean 128,
java ean 128,
java gs1-128,
java gs1-128,
java barcode ean 128,
java ean 128,
java gs1 128,
java gs1-128,
java ean 128,
java gs1 128,
java barcode ean 128,
java barcode ean 128,
java gs1-128,
java barcode ean 128,
java ean 128,
java ean 128,
java gs1 128,
java gs1 128,
java ean 128,
java ean 128,
java barcode ean 128,
java barcode ean 128,
java barcode ean 128,
java gs1 128,
java ean 128,
java barcode ean 128,
java barcode ean 128,
java ean 128,
java gs1 128,
java ean 128,
java gs1 128,
java barcode ean 128,
java barcode ean 128,
java barcode ean 128,
java gs1 128,
java gs1-128,
java gs1-128,
java barcode ean 128,
java ean 128,
java gs1 128,
java gs1 128,
java ean 128,
java ean 128,
java ean 128,
java barcode ean 128,
java barcode ean 128,
java gs1 128,
java gs1 128,

At runtime, the Manning website engine would detect that the authors of the EJB3InAction book really are Larry, Moe, and Curly, and not Debu Panda, Reza Rahman, and Derek Lane. This is an invaluable feature if you develop enterprise applications that can be deployed to a variety of environments. In the simplest case, the differing environments could be a test and a production server. In the most complex case, you could be selling shrink-wrapped enterprise applications deployed to an unknown customer environment. The most obvious way of mixing and matching annotation and XML metadata is to use XML for deployment environment specific configurations while using annotations for everything else. If you really don t like annotations, that s fine too. You can avoid using them completely in favor of XML deployment descriptors. We ll primarily focus on annotations rather than deployment descriptors in this book simply because they are so much more intuitive to look at and explain. Common metadata annotations Obviously, EJB defines its own set of standard annotations. We ll be discussing these annotations throughout this book. During the course of developing Java EE 5.0, it became apparent that the Java EE container as a whole could use some of the annotations geared toward EJB 3. In particular, these annotations are extremely useful in integrating EJB with the web/servlet tier. Some of these annotations were separated out of the EJB 3 spec and christened common metadata annotations. These annotations are a core part of what makes EJB 3 development, including dependency injection, easy. Table 2.1 lists some of the major common metadata annotations. We ll discuss them throughout this part of the book, starting with some of the most fundamental ones in this chapter.

To illustrate the mix-in mechanism, we will extend the order-management application by adding a date to all the orders that are created. We will begin by defining the interface and the class that will be mixed in with the application. The CalendarItf interface defines methods for setting and retrieving a date. The Calendar class, which is shown in Listing 5-8, provides an implementation for this interface. Listing 5-8. The Implementation of the Calendar Class package aop.jboss; import java.util.Date; public interface CalendarItf { public void setDate(Date date); public Date getDate(); } public class Calendar implements CalendarItf { private Object initial; private Date date; public Calendar( Object initial ) { this.initial = initial; date = new Date(); } public void setDate(Date date) { this.date = date; } public Date getDate() { return date; } } In addition to the setDate and getDate methods, the Calendar class defines a constructor that takes an Object as a parameter. This is the constructor that will be called by JBoss AOP when this mix-in class is instantiated. The XML file in Listing 5-9 associates the Calendar mix-in class with the Order application class. Listing 5-9. Defining a Mix-In with JBoss AOP < xml version="1.0" encoding="UTF-8" > <aop> <introduction class="aop.jboss.Order"> <mixin> <interfaces> aop.jboss.CalendarItf </interfaces> <class> aop.jboss.Calendar </class> <construction> new aop.jboss.Calendar(this) </construction>

Since this target depends on the target that creates the ejb.jar file, it can assume that a JAR file (with the project name) exists. Using the <copy> tag, the target creates a temporary JAR file. Next, the <java> tag sets up the classpath, names the class to execute (the weblogic.ejbc class), and also uses the <arg> tag to add arguments to the execution of the Java class. These arguments are specific to the EJB compiler needed by the EJB container. Once the execution is complete, the target completes execution by deleting the temporary JAR file it used as input to the EJB compiler. The execution of the EJB compiler produced a new JAR file, again named after the project.

Figure 11.3 The class loader by default follows Parent First Delegation model. When a class is required, it first asks its parent to load the class.

which the JVM searches for classes. This approach is called the Parent First delegation model. Now that we ve reviewed the basics of Java class loading, let s quickly review how class loading works in a Java EE application.

Unit-testing stateless session beans helps you catch errors in your business logic before moving your application to the next phase: application or user testing. Using Cactus, you can create tests that execute in the EJB container in order to test not only the business logic, but also the deployment of the EJBs in the EJB container. This integration testing helps prevent deployment errors long before it s time to move the application into other environments.