Singleton

```
@Target(value=TYPE)
 @Retention(value=RUNTIME)
public @interface Singleton
```
Component-defining annotation for a singleton session bean.

Since:

EJB 3.1

Examples (en):

xa-datasource, webservice-ws-with-resources-config, webservice-handlerchain, tomee-jersey-eclipselink, singleton-startup-ordering, simple-singleton, simple-remote-tomcatusers, schedule-methods, schedule-methods-meta, schedule-expression, schedule-events, rest-on-ejb, rest-example, rest-example-with-application, rest-applicationcomposer-mockito, resources-jmx-example, resources-declared-in-webapp, reload-persistence-unit-properties, polling-parent, myfaces-codi-demo, injection-of-env-entry, dynamic-proxy-to-access-mbean, dynamic-implementation, dynamic-datasource-routing, deltaspike-fullstack, datasource-versioning, connector-war, change-jaxws-url, cdi-events, cdi-alternative-and-stereotypes, bval-evaluation-redeployment, async-servlet, async-postconstruct, async-methods, access-timeout, access-timeout-meta

Examples (es):

simple-singleton, myfaces-codi-demo, async-methods, access-timeout, access-timeout-meta

Examples (pt):

xa-datasource, webservice-ws-with-resources-config, webservice-handlerchain, simple-remote-tomcatusers, myfaces-codi-demo, injection-of-env-entry, dynamic-proxy-to-access-mbean, dynamic-datasource-routing, deltaspike-fullstack, datasource-versioning, change-jaxws-url, cdi-events, cdi-alternative-and-stereotypes, async-servlet, async-postconstruct, async-methods, access-timeout, access-timeout-meta

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element and Description
`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.

- Element Detail
  - name
```
public abstract java.lang.String name
```
    The ejb-name for this bean. Defaults to the unqualified name of the singleton session bean class.
    
    Returns:
    
    a String object.
    
    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.
    
    Returns:
    
    a String object.
    
    Default:
    
    ""
- - description
```
public abstract java.lang.String description
```
    A string describing the singleton session bean.
    
    Returns:
    
    a String object.
    
    Default:
    
    ""

Annotation Type Singleton

Optional Element Summary

Element Detail

name

mappedName

description