Read system properties in Spring XML config application with expression language

Question

It seems to be easy, but it does not work. I can't paste system property in my easy example:

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:client.properties</value> </list> </property> <property name="searchSystemEnvironment" value="true"/> <property name="ignoreResourceNotFound" value="true"/> <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/> </bean> <bean id="client" class="com.epam.spring.Client" c:id="${id}" p:fullName="#{systemEnvironment['user.name']}" p:greeting="${greeting}" />

Bean Client is ok, but field fullName is always null. In every case i have in fullName NULL, help me, please, what's wrong? I tried to use other systemEnvironment['something.else'], but it does not help. Tries like this: p:fullName="#{ T(java.lang.System).getenv().get('java.version') }" But id don't want to work.

Just a clarification: Please, note that in Java context "system properties" are set with -Dprop=value and are distinct from OS environment variables. Using SpEL and systemEnvironment accesses the latter, not "system properties" mentioned in the title. System properties are accessed by systemProperties, example in this answer: stackoverflow.com/a/22630883/658826 — virgo47
– virgo47, Commented Jul 12, 2021 at 8:22

IvanSPb · Accepted Answer · 2017-10-29 17:48:09Z

I found the solution! Issue in this line: p:fullName="#{systemEnvironment['user.name']}"

Just write

p:fullName="#{systemProperties['user.name']}

and all is ok )))

And it is important, I think, operational system: windows 10

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