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tutorial/cdi-basic003.html at gh-pages · javaee/tutorial · GitHub
This repository was archived by the owner on Jan 28, 2019. It is now read-only.
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<!DOCTYPE html
>
<
html
lang
="
en
"
>
<
head
>
<
meta
charset
="
utf-8
"
/>
<
title
>
About Beans
</
title
>
<
meta
name
="
viewport
"
content
="
width=device-width, initial-scale=1.0
"
>
<
link
href
="
css/style.css
"
rel
="
stylesheet
"
>
<
script
src
="
https://use.fontawesome.com/96c4d89611.js
"
>
</
script
>
</
head
>
<
body
>
<
table
id
="
doc-title
"
cellspacing
="
0
"
cellpadding
="
0
"
>
<
tr
>
<
td
align
="
left
"
valign
="
top
"
>
<
b
>
Java Platform, Enterprise Edition (Java EE) 8
</
b
>
<
br
/>
<
b
>
The Java EE Tutorial
</
b
>
<!-- <p class="beta">Beta Draft (Pre-General Availability)</p> -->
</
td
>
</
tr
>
</
table
>
<
hr
/>
<
table
width
="
90%
"
id
="
top-nav
"
cellspacing
="
0
"
cellpadding
="
0
"
>
<
colgroup
>
<
col
width
="
12%
"
/>
<
col
width
="
12%
"
/>
<
col
width
="
*
"
/>
</
colgroup
>
<
tr
>
<
td
align
="
left
"
>
<
a
href
="
cdi-basic002.html
"
>
<
span
class
="
vector-font
"
>
<
i
class
="
fa fa-arrow-circle-left
"
aria-hidden
="
true
"
>
</
i
>
</
span
>
<
span
style
="
position:relative;top:-2px;
"
>
Previous
</
span
>
</
a
>
</
td
>
<
td
align
="
left
"
>
<
a
href
="
cdi-basic004.html
"
>
<
span
class
="
vector-font
"
>
<
i
class
="
fa fa-arrow-circle-right vector-font
"
aria-hidden
="
true
"
>
</
i
>
</
span
>
<
span
style
="
position:relative;top:-2px;
"
>
Next
</
span
>
</
a
>
</
td
>
<
td
align
="
right
"
>
<
a
href
="
toc.html
"
>
<
span
class
="
vector-font
"
>
<
i
class
="
fa fa-list vector-font
"
aria-hidden
="
true
"
>
</
i
>
</
span
>
<
span
style
="
position:relative;top:-2px;
"
>
Contents
</
span
>
</
a
>
</
td
>
</
tr
>
</
table
>
<
div
id
="
preamble
"
>
<
div
class
="
sectionbody
"
>
<
div
class
="
paragraph
"
>
<
p
>
<
a
id
="
GJEBJ
"
>
</
a
>
<
a
id
="
about-beans
"
>
</
a
>
</
p
>
</
div
>
</
div
>
</
div
>
<
div
class
="
sect1
"
>
<
h2
id
="
_about_beans
"
>
About Beans
</
h2
>
<
div
class
="
sectionbody
"
>
<
div
class
="
paragraph
"
>
<
p
>
CDI redefines the concept of a bean beyond its use in other Java
technologies, such as the JavaBeans and Enterprise JavaBeans (EJB)
technologies. In CDI, a bean is a source of contextual objects that
define application state or logic. A Java EE component is a bean if
the lifecycle of its instances may be managed by the container according
to the lifecycle context model defined in the CDI specification.
</
p
>
</
div
>
<
div
class
="
paragraph
"
>
<
p
>
More specifically, a bean has the following attributes:
</
p
>
</
div
>
<
div
class
="
ulist
"
>
<
ul
>
<
li
>
<
p
>
A (nonempty) set of bean types
</
p
>
</
li
>
<
li
>
<
p
>
A (nonempty) set of qualifiers (see
<
a
href
="
cdi-basic006.html#GJBCK
"
>
Using
Qualifiers
</
a
>
)
</
p
>
</
li
>
<
li
>
<
p
>
A scope (see
<
a
href
="
cdi-basic008.html#GJBBK
"
>
Using Scopes
</
a
>
)
</
p
>
</
li
>
<
li
>
<
p
>
Optionally, a bean EL name (see
<
a
href
="
cdi-basic009.html#GJBAK
"
>
Giving
Beans EL Names
</
a
>
)
</
p
>
</
li
>
<
li
>
<
p
>
A set of interceptor bindings
</
p
>
</
li
>
<
li
>
<
p
>
A bean implementation
</
p
>
</
li
>
</
ul
>
</
div
>
<
div
class
="
paragraph
"
>
<
p
>
A bean type defines a client-visible type of the bean. Almost any Java
type may be a bean type of a bean.
</
p
>
</
div
>
<
div
class
="
ulist
"
>
<
ul
>
<
li
>
<
p
>
A bean type may be an interface, a concrete class, or an abstract
class and may be declared final or have final methods.
</
p
>
</
li
>
<
li
>
<
p
>
A bean type may be a parameterized type with type parameters and type
variables.
</
p
>
</
li
>
<
li
>
<
p
>
A bean type may be an array type. Two array types are considered
identical only if the element type is identical.
</
p
>
</
li
>
<
li
>
<
p
>
A bean type may be a primitive type. Primitive types are considered to
be identical to their corresponding wrapper types in
<
code
>
java.lang
</
code
>
.
</
p
>
</
li
>
<
li
>
<
p
>
A bean type may be a raw type.
</
p
>
</
li
>
</
ul
>
</
div
>
</
div
>
</
div
>
<
hr
/>
<
table
width
="
90%
"
id
="
bottom-nav
"
cellspacing
="
0
"
cellpadding
="
0
"
>
<
colgroup
>
<
col
width
="
12%
"
/>
<
col
width
="
12%
"
/>
<
col
width
="
*
"
/>
</
colgroup
>
<
tr
>
<
td
align
="
left
"
>
<
a
href
="
cdi-basic002.html
"
>
<
span
class
="
vector-font
"
>
<
i
class
="
fa fa-arrow-circle-left
"
aria-hidden
="
true
"
>
</
i
>
</
span
>
<
span
style
="
position:relative;top:-2px;
"
>
Previous
</
span
>
</
a
>
</
td
>
<
td
align
="
left
"
>
<
a
href
="
cdi-basic004.html
"
>
<
span
class
="
vector-font
"
>
<
i
class
="
fa fa-arrow-circle-right vector-font
"
aria-hidden
="
true
"
>
</
i
>
</
span
>
<
span
style
="
position:relative;top:-2px;
"
>
Next
</
span
>
</
a
>
</
td
>
<
td
align
="
right
"
>
<
a
href
="
toc.html
"
>
<
span
class
="
vector-font
"
>
<
i
class
="
fa fa-list vector-font
"
aria-hidden
="
true
"
>
</
i
>
</
span
>
<
span
style
="
position:relative;top:-2px;
"
>
Contents
</
span
>
</
a
>
</
td
>
</
tr
>
</
table
>
<
span
id
="
copyright
"
>
<
a
href
="
img/cpyr.adoc
"
>
<
img
src
="
img/oracle.gif
"
height
="
10px
"
alt
="
Oracle Logo
"
/>
<
span
>
Copyright © 2017, Oracle and/or its affiliates. All rights reserved.
</
span
>
</
a
>
</
span
>
<!--<p align="center" class="beta">Beta Draft (Pre-General Availability)</p> -->
</
body
>
</
html
>
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