ejb | 易学教程

EJB 3 Session Bean Design for Simple CRUD

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问题 I am writing an application that's sole purpose in life is to do CRUD operations for maintaining records in database. There are relationships between some of the tables/entities. Most examples I've seen for creating session beans deals with complex business logic/operations that interact with many entities which I don't have. Since my application is so very basic, what would be the best design for the session bean(s)? I was thinking of having one session bean per entity which had CRUD the

Spring学习总结——Spring概念详解

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Spring是一个开源框架，Spring是于2003 年兴起的一个轻量级的Java 开发框架，由Rod Johnson创建。简单来说，Spring是一个分层的JavaSE/EEfull-stack(一站式) 轻量级开源框架。你可能正在想“Spring不过是另外一个的framework”。当已经有许多开放源代码（和专有）J2EEframework时，我们为什么还需要Spring Framework？Spring是独特的，因为若干个原因：它定位的领域是许多其他流行的framework没有的。Spring致力于提供一种方法管理你的业务对象。Spring是全面的和模块化的。Spring有分层的体系结构，这意味着你能选择使用它孤立的任何部分，它的架构仍然是内在稳定的。因此从你的学习中，你可得到最大的价值。例如，你可能选择仅仅使用Spring来简单化JDBC的使用，或用来管理所有的业务对象。它的设计从底部帮助你编写易于测试的代码。Spring是用于测试驱动工程的理想的framework。Spring对你的工程来说，它不需要一个以上的framework。Spring是潜在地一站式解决方案，定位于与典型应用相关的大部分基础结构。它也涉及到其他framework没有考虑到的内容。背景 Rod Johnson在2002年编著的《Expert one on one J2EE design and

“java.lang.AbstractMethodError: org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager” with Hibernate

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问题 I'm working with Hibernate, EJB and a Restfull webservice. I have this exception below, and i don't know what to do. WARNING: EJB5184:A system exception occurred during an invocation on EJB PessoaResource, method: public java.lang.String service.PessoaResource.findAll() WARNING: javax.ejb.EJBException at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:748) at com.sun.ejb.containers.EJBContainerTransactionManager.completeNewTx

“java.lang.AbstractMethodError: org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager” with Hibernate

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Difference between Java Bean and Enterprise Java Beans? [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . Are they different or they are used interchangeably? If they are Different, then what made them different from each other? 回答1: A JavaBean is just a plain old Java object that conforms to certain conventions including the use of accessor functions (getFoo/setFoo) for member access

Can't get SessionContext on EJB

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问题 I can't get a SessionContext object on an EJB. I've tried all the options suggested on 4 Ways to Get EJBContext in EJB 3 and none of them worked. For example, the following code in my project... @Stateful public class SecurityService { @Resource private SessionContext context; @PostConstruct public void init() { } } ... generates the following exception during deploy: [#|2012-02-28T14:35:02.805-0300|SEVERE|glassfish3.1.1|javax.enterprise.system.core.com.sun.enterprise.v3.server|_ThreadID=18;

EJB Rollback does not work with Container Management Transaction or Bean Managament Transaction on commit exception

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问题 I spent hours triying to do a rollback with EJB. I have a CDI controller where I want to remove some object. When I try to remove in EJB I get an exception and I Try to do rollback, but It does not work. Every SQL which has been execute with commit before get the exception does not rollback. Obviusly It is not because I get another exception when I try to do the rollback in BMT. Otherwise when I tried with CMT I get an exception of hibernate but I get the same results that BMT. My controller

EntityManager is null inside Pojo class in ejb container

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问题 I have a Java web service module and ejb modulein netbeans (All part of an enterprise application). the web service is consuming the ejb class using @EJB injection. Inside the ejb module i have a TransactionManager class which is not an enterprise bean. just a POJO class. I am trying to inject the EntityManager using @PersistanceContext(unitName = "testPU") EntityManager em; but the em is allways null. I am calling the TransactionManager class from by bean, and if i declare the EntityManager

EntityManager is null inside Pojo class in ejb container

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Spring Cloud Config + ejb

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问题 I am setting for my application set the 'Spring Cloud Config' (http://cloud.spring.io/spring-cloud-config/) to make all the centralized settings, however there is a problem, I have a set of 10 applications, however an application is using legacy EJB, there are some connector or customer 'Spring Cloud Client Setup' for EJB? 回答1: Non-Spring java apps and non-java apps can use the spring cloud config server rest api. See this answer. You would probably be interested in these endpoints that