java 使用@Resource 注解的 SessionContext 注入
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SessionContext Injection using @Resource annotation
提问by anergy
I need to rollback in EJB 3 Stateless SessionBean (CMT, JBoss version 5), for which I am using
我需要回滚我正在使用的 EJB 3 Stateless SessionBean（CMT，JBoss 版本 5）
sessionContext.setRollbackOnly();
This sessionContext is injected using @Resource annotation. My questions: 1) Is it preferred way to rollback in EJB3?
这个 sessionContext 是使用 @Resource 注释注入的。我的问题：1）它是在 EJB3 中回滚的首选方式吗？
2) Why Jboss complains on deployment if I use public setter injection
2) 如果我使用公共 setter 注入，为什么 Jboss 会抱怨部署
// throws exception on deployment.
private SessionContext sessionContext;
@Resource
public void setSessionContext(SessionContext sessionContext) {
this.sessionContext = sessionContext;
}
but following works fine:
但以下工作正常：
@Resource
private SessionContext sessionContext;
Here is the exception in first case:
这是第一种情况的例外：
javax.ejb.SessionContext is an interface, and JAXB can't handle interfaces.
this problem is related to the following location:
at javax.ejb.SessionContext
at public javax.ejb.SessionContext invoice.sap.service.jaxws.SetSctx.arg0
at invoice.sap.service.jaxws.SetSctx
javax.ejb.SessionContext does not have a no-arg default constructor.
this problem is related to the following location:
at javax.ejb.SessionContext
回答by Brett Kail
I assume the EJB is an @WebService, which is why you're getting JAXB errors. Try:
我假设 EJB 是一个 @WebService，这就是您收到 JAXB 错误的原因。尝试：
@Resource
@WebMethod(exclude=true)
public void setSessionContext(SessionContext sessionContext) {
this.sessionContext = sessionContext;
}
Alternatively, change the method visibility or add the final modifier (only public non-final non-static methods are webservices methods).
或者，更改方法可见性或添加 final 修饰符（只有公共非最终非静态方法是 Web 服务方法）。
回答by Heiko Rupp
1) yes
1) 是的
2) Dunno, perhaps a bug, perhaps deprecated. I've glanced through the EJB 3.1 spec and there I only saw the @Resource SessionContext sessionContextform, while the EJB 3.0 spec also showed the setter injection.
2）Dunno，也许是一个错误，也许已被弃用。我浏览了 EJB 3.1 规范，在那里我只看到了@Resource SessionContext sessionContext表单，而 EJB 3.0 规范还显示了 setter 注入。
