java itext pdf remove text

java itext pdf remove text

java itext pdf remove text

Site health refers to a number of factors, including error messages, access denied messages, and page not found messages. The Recent log entries report contains a list of all system messages added to the log, including access denied messages, content creation messages, PHP error messages, and more (see Figure 11-6). Additionally, the list of entries can be filtered by both message type and severity. Two reports, top access denied errors and top page not found errors, provide you with a quick report of the most common errors. You will want to frequently check these reports. The top access denied

As we mentioned earlier, EJB 3 and Spring are often seen as competitors; however, if you look more closely, you can see that they can also be complementary. Spring has some particularly strong points: support for inversion of control (IoC) for components with simple lifecycles such as singletons; feature-heavy (but slightly more complex) aspect-oriented programming (AOP) support; a number of simple interfaces such as JDBCTemplate and JMSTemplate utilizing common usage patterns of low-level Java EE APIs; and so on. EJB 3, on the other hand, provides better support for transparent state management with stateful session beans, pooling, thread-safety, robust messaging support with MDBs, integrated support for distributed transaction management, standardized automated persistence through JPA, and so on. From a levelheaded, neutral point of view, EJB 3 and Spring can be complementary technologies. The good news is that parts of both the Spring and Java EE communities are working diligently to make Spring/EJB 3 integration a reality. This is particularly good news if you have a significant investment in Spring but want to utilize the benefits of EJB 3. We ll talk about Spring/EJB 3 integration in more detail in chapter 16. However, we d like to list the possibilities now. Treating EJB 3 business-tier components as Spring beans It is possible to treat EJB 3 business-tier components as Spring beans. This translates into an architecture shown in figure 1.8. In this architecture, Spring is used for gluing together the application that contains EJB 3 business-tier components. The Spring Pitchfork project, part of Spring 2, is meant to make such an integration scenario completely transparent. The Spring framework plans to

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Figure 1.8 Spring/EJB 3 integration strategy. It is possible to use EJB 3 business-tier components as if they were Spring beans. This allows you to use the complementary strengths of both technologies in a hybrid fashion.

persistence provider is guaranteed to implement it. You should check your provider s documentation before spending too much time figuring out which entity columns should be lazily fetched. Loading related entities One of the most intricate uses of fetch modes is to control the retrieval of related entities. Not too surprisingly, the EntityManager s find method must retrieve all entities related to the one returned by the method. Let s take the ActionBazaar Item entity, an exceptionally good case because it has a many-to-one, a one-tomany, and two many-to-many relationships. The only relationship type not represented is one-to-one. The Item entity has a many-to-one relationship with the Seller entity (a seller can sell more than one item, but an item can be sold by only one seller), a one-to-many relationship with the Bid entity (more than one bid can be put on an item), and a many-to-many relationship with the Category entity (an item can belong to more than one category and a category contains multiple items). These relationships are depicted in figure 9.7. When the find method returns an instance of an Item, it also automatically retrieves the Seller, Bid, and Category entities associated with the instance and populates them into their respective Item entity properties. As we see in listing 9.8, the single Seller entity associated with the Item is populated into the seller property, the Bid entities associated with an Item are populated into the bids List, and the Category entities the Item is listed under are populated into the categories property. It might surprise you to know some of these relationships are retrieved lazily.

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report may tell you whether someone is trying to hack into your web site, while the top page not found errors report will tell you whether a link is broken or an image is missing.

Figure 9.7 The Item entity is related to three other entities: Seller, Bid, and Category. The relationships to Item are many-to-one, one-to-many, and many-to-many, respectively.