learn j2ee

What is J2EE? In enterprise applications, there are some general enterprise requirement modules, such as database connection, mail service, and transaction processing. since many enterprise applications need these modules, some large companies have developed their own general module services, that is, middleware. this avoids repeated development, long development cycle, and poor code reliability. however, the middleware incompatibility problems of var

The problem of Java Chinese has been plagued by many beginners. If we understand the Chinese problem principle of the Java System, we can take a fundamental solution to the Chinese problem. The oldest solution is to use string bytecode conversion, which is inconvenient. We need to break the object encapsulation and perform bytecode conversion. Another method is to encode the J2EE container. If the J2EE appl

The spring + easyjweb + ibatis J2EE online shopping jpetstore system is developed by the easyjf team. The business layer and persistence layer use the jpetsotre source code on springframework, and the presentation layer uses easyjweb, this system is a simple J2EE online store system, including product list, shopping cart, user management, online order and other functions. Source code: http://dl.easyjf.co

In distributed enterprise applications, asynchronous messaging is used to effectively coordinate the work of each part. J2EE provides JMS and message-driven bean for asynchronous message transmission between various components of the application. 1. What is a message system? Generally, a messaging system allows reliable asynchronous communication between separate uncoupled applications. In enterprise applications, an asynchronous, non-blocking messag

I,Description During large-scale J2EE project development, middleware such as Weblogic is often used as the application server to facilitate database connection pools, tuxedo services, and server cluster configuration.However, eclipse does not have WebLogic by default for server support. Therefore, you need to manually install the configuration. I personally do not like the huge and inflexibility of myeclipse.Describe my ide configuration. II,Oracle E

with ALT + shift) Alt + Shift + R Rename (one of my favorite ones, especially the rename of variables and classes, which saves a lot of labor compared with manual methods) Alt + Shift + M extraction method (this is one of the most common methods in refactoring, especially useful for a lot of mud code) Alt + Shift + C modify the function structure (more practical. N functions call this method and modify it once) Alt + Shift + L extract local variables (you can directly extract some magic

Complete version with link: Http://files.cnblogs.com/lovecindywang/.net.pdf Http://files.cnblogs.com/lovecindywang/j2ee.pdf The open-source and non-open-source platforms (of course, Many of Microsoft's products are also open-source) differ greatly from the following: There are indeed many good open-source products, but the quality is also uneven. The compatibility of different products in different versions is also a problem. Non-Open SourceCommunityThe contribution is relatively smal

I used to encounter this error when I used to patch Bi java. If there are different solutions on the Internet, I 'd like to share my solutions with you: Cannot login to the SAP J2EE Engine UsingUser and password as provided in the filesystem secure store. Enter valid loginInformation in the filesystem secure store usingSAP J2EE engine config tool. For more information, see sap note 701654. In fact, you on

Document directory Transaction Introduction JDBC transactions JTA (xa) Transaction Transaction Introduction 　　Generally, the J2EE Application Server supports JDBC transactions and JTA (Java transaction API) Transactions (usually managed by containers ). Generally, it is better not to use the above three transaction types in the program at the same time, such as nesting JDBC transactions in JTA transactions. Second, the transaction should be compl

data types provided in Oracle: Blob, clob, and nclob: three large objects (LOB) are used to save large image files or formatted text files, such as Word documents and non-text files such as audio and video files, the maximum length is 4 GB. Dizzy data is stored in the database. Bfile: A large binary object file stored outside the database. The maximum length is 4 GB. This type of LOB is used to record changes in the database, however, data is stored outside the database. Raw data types provided

label: des style blog Io for sp c on CTI 常用的J2EE应用服务器包括Weblogic、WebSphere和Tomcat等，以下是以WebLogic为例给出的计数器。 类别 计数器名称 计数器描述 JVM Heap Size JVM堆大小，该计数器的值是一个实时值 Heap Free JVM可用堆大小，该计数器的值是一个实时值 JDBC Connection Pool Waiting For ConnectionCurrent Count 等待的连接数量。如果该计数器的值持续较大，可能需要考虑增加应用服务器的JDBC连接池 Connections Total Count 总的JDBC连接数 Max Capacity JDBC连接池的总容量。可以通过该计数器和上两个计数器值的比较，获得连接池设置是

For the latest project, record it. First, let the J2EE brothers pass the interface classes implemented by the server Hessian and the public methods of this interface class into and return the classes that need to be serialized to themselves, and copy will also work, you can also compress it into a jar package. The package name and Class Name of the interface-related classes must also be the same as that of the server. The rest is that the client ha

Javascript, IMG, SRC, JSP, J2EE, hibernate, Struts-2.0 Environment: Eclipse, struts2, hibernate3.0 JSP, J2EE, JavaScript [write: drs163@163.com www.newsoftstudio.com] The struts2 action on the background server can return a list set to the JSP page. one project is a string of the file path. when the actual JSP page is displayed, each line of record is preceded by a small icon determined based on the file ty

Where is the development path of the J2EE technology? Author: Chen yuefeng From: http://blog.csdn.net/mailbomb I came into contact with the j2's Technology in 2002. At that time, the company needed to use a mobile terminal to access an internal project, so I learned the j2's technology, in the first half of 2003, I joined my colleagues in completing a project using the J2EE technology. However, after the

Classic J2EE design mode JSP-ACTION-Delegate-EJB-Service In, the business logic is implemented at the Service layer. We often see that the method with the same signature appears N times, but it is to pass the responsibility layer back, and ultimately implemented by the Service. The reason why there is a Delegate is that EJB users are reluctant to face the complex interface of EJB, while EJB writers often know how to call it. Therefore, EJB writers w