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two instances, may lead to run-time errors; or alternatively, because one instance is sufficient to offer all the services required, and by ensuring that not more than one instance is created, you economize memory and resources The solution to the problem: The class must have a static attribute, usually called instance, to store a reference to the unique instance, as well as a method, generally called getInstance, that returns the value of instance If the instance is null, getInstance creates a new instance of the class and stores its reference in the instance attribute, and then returns it to the caller Listing 8-1 shows one way in which the singleton can be implemented using Java Listing 8-1. rdlc pdf 417 PDF417 Barcode Creating Library for RDLC Reports | Generate ...
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NET web & IIS applications; Easy to draw & create 2D PDF - 417 barcode images in jpeg, gif, png and bitmap files; Able to generate & print PDF - 417 in RDLC ... If you specify a version other than 3.0 (e.g., 2.1), then the EJB container will assume the EJB module is an older version and won t scan for annotations. This means it won t detect EJB 3 beans, or detect the persistence unit containing entities packaged in the EJB module. Make sure that version is either set to 3.0 or not specified at all. tence layer for enterprise applications. Accessing a data source is one of the most common tasks for EJBs. Whether you use entity beans or session beans with data access objects, this chapter should provide you with solutions for your data access problems. The topics we cover here range from using CMP persistence, to modeling entity bean relationships, to developing custom finder methods. In this chapter, you will learn about the following topics: rdlc pdf 417 PDF - 417 Client Report RDLC Generator | Using free sample for PDF ...
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Barcode Control SDK supports generating Data Matrix, QR Code, PDF - 417 barcodes in RDLC Local Report using VB and C# class library both in ASP.NET and ... Implementation of the Singleton Design Pattern Using Java public class MySingleton { private static MySingleton instance = null; public static MySingleton getInstance() { if (instance==null) { instance = new MySingleton(); } return instance; } } Because of the method getInstance, any class using MySingleton is ensured to be using the same instance of this class The inconvenience of this is that the new operator cannot be used directly by the other classes to instantiate MySingleton Using the Singleton design pattern is therefore not transparent for the classes that use MySingleton because these classes have to call getInstance instead of the usual constructor The issue of transparency in a design pattern, with respect to the other classes of an application, is not limited to the Singleton design pattern In general, the use of a design pattern in an application has important implications for the classes with which it interacts. Using data sources on a per-user basis Creating EJB 2.0 CMP entity beans Generating primary key values Finding a collection of entity beans Creating one-to-one entity relationships Creating one-to-many entity relationships Using a cascading delete Creating read-only entity beans Making use of a stored procedure Using EJB-QL Creating entity beans across table joins Tracking data changes Encapsulating entity bean access Discovering information about entity beans Reducing the number of calls to entity beans Managing large result sets ChargeCredit and ChargeCreditHome are the remote and home interfaces, respectively, of ChargeCreditEJB. Use the create method to get a reference to the remote interface, and then invoke the desired business method (in this case add) on the bean. As you can see from this example, EJB 3 supports the EJB 2 concepts, and the programming model is straightforward. If, instead of calling an EJB 2 session bean you d like to invoke an EJB 2 CMP entity bean from EJB 3, you d follow a similar approach to the previous example. Assume that ActionBazaar used EJB 2 CMP entity beans for its persistence tier. The specific case we ll discuss is one in which the PlaceBid EJB persists the Bid bean as follows: Connecting to a database via JDBC is essential in many applications. For instance, a session bean needs to access data to complete a business function, and entity beans with bean-managed persistence require access to a JDBC connection to load
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