@Value("#{systemProperties.xxx}") with default value in Spring

If you run the following code with null:

  @Value("#{systemProperties.someResourceLocation}")
  private String someResourceLocation;

you will get the following exception:

Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 17): Property or field 'someResourceLocation' cannot be found on object of type 'java.util.Properties' - maybe not public?

You can use the following code instead:

  @Value("${someResourceLocation:" + DEFAULT_SOME_RESOURCE_LOCATION + "}")
  private String someResourceLocation;

Reference:
http://javavirtuoso.blogspot.kr/2012/11/autowiring-optional-properties-with.html