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Explicit notes on access to standard context beans in SpEL expressions

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Closes gh-25037
This commit is contained in:
Juergen Hoeller
2020-05-18 14:19:05 +02:00
parent 9d429e30de
commit 28177ad91b
2 changed files with 15 additions and 7 deletions
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15
src/docs/asciidoc/core/core-expressions.adoc
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@@ -539,8 +539,12 @@ example shows:
</bean>
----
The `systemProperties` variable is predefined, so you can use it in your expressions, as
the following example shows:
All beans in the application context are available as predefined variables with their
common bean name. This includes standard context beans such as `environment` (of type
`org.springframework.core.env.Environment`) as well as `systemProperties` and
`systemEnvironment` (of type `Map<String, Object>`) for access to the runtime environment.
The following example shows access to the `systemProperties` bean as a SpEL variable:
[source,xml,indent=0,subs="verbatim"]
----
@@ -551,8 +555,7 @@ the following example shows:
</bean>
----
Note that you do not have to prefix the predefined variable with the `#`
symbol in this context.
Note that you do not have to prefix the predefined variable with the `#` symbol here.
You can also refer to other bean properties by name, as the following example shows:
@@ -576,8 +579,8 @@ You can also refer to other bean properties by name, as the following example sh
[[expressions-beandef-annotation-based]]
=== Annotation Configuration
To specify a default value, you can place the `@Value` annotation on fields, methods, and method or constructor
parameters.
To specify a default value, you can place the `@Value` annotation on fields, methods,
and method or constructor parameters.
The following example sets the default value of a field variable: