使ejb与已存在的非java语言的(例如c++、cobol)现有系统整合起来。实事上,corba和ejb有非常密切的联系。j2ee中许多的概念来源于corba. corba是ejb的基础 许多的ejb的概念都来自于corba。ejb和j2ee带来的是java为中心的,基于组件的,适合快速应用开发的中间件程序结构。使用corba,要求写复杂的中间件api的程序,这无疑要求...
依赖注入和JNDI访问资源 @Resource:EJB3中依赖注入最全面的注解; 参数: name: 其值会在容器进一步解析, 其形式为 java:conp/env/{name}的全限定JNDI名; 在幕后容器在部署过程中会把EJB组件, 服务解析为资源, 并把资源绑定到ENC(环境命名上下文); 使用设置器(setter)注入, 方便单元测试, 便于初始化 @Resource...
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Advanced Certification CloudComputing And DevOps Advanced CertificationIn Business Analytics ArtificialIntelligence And Machine Learning DevOps Certification GameDevelopment Certification Front-End DeveloperCertification AWS Certification Training PythonProgramming Certification COMPILERS & EDITORS Java ...
Advanced Properties baseContextRef A reference to top level contextService element (string). Specifies a base context service from which to inherit context that is not already defined on this context service.timerService > nonPersistentContextService > baseContext > classloaderContextA...
**/ // Default Finder: <query> element in ejb-jar.xml not required public Topic findByEmpNo(Integer empNo); } Custom TopLink Finders You can take advantage of the TopLink query and expression framework to define advanced finders, including Call, DatabaseQuery, primary key, Expression, EJB...
EJB accelerators exist primarily in the middle tier of a J2EE architecture. Their role is to accelerate the performance of storing data needed for Enterprise Java Beans (EJBs). By speeding up the performance of the data storage, the performance of EJBs are accelerated in general. There are ...
EJB 1.1 Advanced Finder Methods Specifying thefindByPrimaryKeymethod is easy to do in OC4J. All the fields for defining a simple or complex primary key are specified within theejb-jar.xmldeployment descriptor. However, if you want to define other finder methods in a CMP entity bean, you must...
The most important one in this set of enhancements is the ability to declaratively create cron-like schedules to trigger EJB methods (there are more advanced features; feel free to check them out when the spec draft comes out). For example, all you would have to do is annotate an EJB me...
QueryServiceEJBRemote: Use this interface for advanced queries. ProcessInstanceMigrationServiceEJBRemote: Use this interface to migrate process instances when a new version of a process definition is deployed. If you run EJB applications and...