Environment Variables in Spring?

[dleal]

I would like to know how to access to an environment variable in Spring. For example I would like to use some environment variable in order to set the url property:

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
      <property name="driverClassName"><value>org.hsqldb.jdbcDriver</value></property>
      <property name="url">
        <value>jdbc&#58;hsqldb&#58;P&#58;/springapp/v6/springapp/db/test</value>
      </property>
    </bean>

but I don't know which environment variables are accepted by Spring configuration files and how to use them (syntax), for example: ${user.home}, $HOME, etc. Any way are there any Spring Environment variables, could be used on the Spring configuration files.

Thanks in advance,

David Leal

[Nicholas_DSJ]

	<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>/WEB-INF/jdbc.properties</value>
			</list>
		</property>
	</bean>

	<bean id="localDS" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="$&#123;jdbc.driverClassName&#125;"/>
		<property name="url" value="$&#123;jdbc.url&#125;"/>
		<property name="username" value="$&#123;jdbc.username&#125;"/>
		<property name="password" value="$&#123;jdbc.password&#125;"/>
	</bean>

[dleal]

Thanks Nicholas for your replay, but I am asking for something diferent.

Let say you want to refer some environment variable on the jdbc.properties file or directly on the file: myapplication-servlet.xml, for
example, what about using: JAVA_HOME, environment variable, or any othe classical variable. Does spring load the environment variable information on the startup process? What is the syntax to use in order
to refer them. In a similar way like Ant: ${java.home}, which is a system variable loaded on the ant startup process.

I hope, now I have explained better,

Thanks,

David

[s100w]

See the PropertyPlaceholderConfigurer Javadocs:

"A configurer will also check against system properties (e.g. "user.dir") if it cannot resolve a placeholder with any of the specified properties. This can be customized via "systemPropertiesMode"."

[Alarmnummer]

See also your other topic:

http://forum.springframework.org/showthread.php?t=17174

I think the conclusion is:

-it is not a problem to use variables in Spring
-it is not a problem to use system properties in Spring
-but it is a problem to use environmental variables, because it is complicated to retrieve them.