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tutorial/cdi-basic007.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
>
Injecting 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-basic006.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-basic008.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
="
GJBAN
"
>
</
a
>
<
a
id
="
injecting-beans
"
>
</
a
>
</
p
>
</
div
>
</
div
>
</
div
>
<
div
class
="
sect1
"
>
<
h2
id
="
_injecting_beans
"
>
Injecting Beans
</
h2
>
<
div
class
="
sectionbody
"
>
<
div
class
="
paragraph
"
>
<
p
>
To use the beans you create, you inject them into yet another
bean that can then be used by an application, such as a JavaServer Faces
application. For example, you might create a bean called
<
code
>
Printer
</
code
>
into
which you would inject one of the
<
code
>
Greeting
</
code
>
beans:
</
p
>
</
div
>
<
div
class
="
listingblock
"
>
<
div
class
="
content
"
>
<
pre
class
="
prettyprint highlight
"
>
<
code
class
="
language-oac_no_warn
"
data-lang
="
oac_no_warn
"
>
import javax.inject.Inject;
public class Printer {
@Inject Greeting greeting;
...
}
</
code
>
</
pre
>
</
div
>
</
div
>
<
div
class
="
paragraph
"
>
<
p
>
This code injects the
<
code
>
@Default
</
code
>
<
code
>
Greeting
</
code
>
implementation into the
bean. The following code injects the
<
code
>
@Informal
</
code
>
implementation:
</
p
>
</
div
>
<
div
class
="
listingblock
"
>
<
div
class
="
content
"
>
<
pre
class
="
prettyprint highlight
"
>
<
code
class
="
language-oac_no_warn
"
data-lang
="
oac_no_warn
"
>
import javax.inject.Inject;
public class Printer {
@Inject @Informal Greeting greeting;
...
}
</
code
>
</
pre
>
</
div
>
</
div
>
<
div
class
="
paragraph
"
>
<
p
>
More is needed for the complete picture of this bean. Its use of scope
needs to be understood. In addition, for a JavaServer Faces application,
the bean needs to be accessible through the EL.
</
p
>
</
div
>
<
div
class
="
paragraph
"
>
<
p
>
Now that you can identify the target of the injection, it is important to
understand what can be injected and in what context. JSF 2.3 provides producers
that enable most important JSF artifacts to be injected. For detailed information,
see the package
<
a
href
="
https://javaee.github.io/javaee-spec/
"
>
javadoc
</
a
>
for
<
code
>
javax.faces.annotation
</
code
>
.
</
p
>
</
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-basic006.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-basic008.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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