javax.ejb Annotation Type Singleton

最新推荐文章于 2025-07-31 14:41:43 发布

转载最新推荐文章于 2025-07-31 14:41:43 发布 · 517 阅读

本文介绍Java EE中EJB 3.1规范下的@Singleton注解，该注解用于定义单一实例会话Bean。文章详细解释了@Singleton的基本用法及其可选元素，如描述、映射名称和EJB名称。

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javax.ejb
Annotation Type Singleton

@Target(value=TYPE)
@Retention(value=RUNTIME)
public @interface Singleton

Component-defining annotation for a singleton session bean.

Since:

EJB 3.1

Optional Element Summary
`java.lang.String`	`description` A string describing the singleton session bean.
`java.lang.String`	`mappedName` A product specific name(for example, global JNDI name) that this session bean should be mapped to.
`java.lang.String`	`name` The ejb-name for this bean.

name

public abstract java.lang.String name

The ejb-name for this bean. Defaults to the unqualified name of the singleton session bean class.

Default:

mappedName

public abstract java.lang.String mappedName

A product specific name(for example, global JNDI name) that this session bean should be mapped to. Application servers are not required to support any particular form or type of mapped name, nor the ability to use mapped names. The mapped name is product-dependent and often installation-dependent. No use of a mapped name is portable.

Default:

description

public abstract java.lang.String description

A string describing the singleton session bean.

Default:

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