Is there a way to specify a default property value in Spring XML

Question

We are using a PropertyPlaceholderConfigurer to use java properties in our Spring configuration  details here   eg    lt foo name  port  gt     lt value gt   my server port  lt  value gt   lt  foo gt    We would like to add an additional property  but have a distributed system where existing instances could all use a default value   Is there a way to avoid updating all of our properties files  by indicating a default value in the Spring config for when there isn t an overriding property value defined

User · Answer

lt foo name  port  gt      lt value gt   my server port 8088  lt  value gt   lt  foo gt    should work for you to have 8088 as default port  See also  http   blog callistaenterprise se 2011 11 17 configure-your-spring-web-application

User · Answer

Spring 3 supports   my server port defaultValue  syntax

User · Answer

Are you looking for the PropertyOverrideConfigurer documented here   http   static springsource org spring docs 2 5 x reference beans html beans-factory-overrideconfigurer      The PropertyOverrideConfigurer    another bean factory post-processor    is similar to the   PropertyPlaceholderConfigurer  but in   contrast to the latter  the original   definitions can have default values or   no values at all for bean properties    If an overriding Properties file does   not have an entry for a certain bean   property  the default context   definition is used

User · Answer

There is a little known feature  which makes this even better  You can use a configurable default value instead of a hard-coded one  here is an example   config properties   timeout default 30 timeout myBean 60   context xml    lt bean id  propertyConfigurer  class  org springframework beans factory config PropertyPlaceholderConfigurer  gt       lt property name  location  gt           lt value gt config properties lt  value gt       lt  property gt   lt  bean gt    lt bean id  myBean  class  Test  gt       lt property name  timeout  value    timeout myBean   timeout default      gt   lt  bean gt    To use the default while still being able to easily override later  do this in config properties   timeout myBean     timeout default

User · Answer

http   thiamteck blogspot com 2008 04 spring-propertyplaceholderconfigurer html points out that  local properties  defined on the bean itself will be considered defaults to be overridden by values read from files    lt bean id  propertyConfigurer class  org springframework beans factory config PropertyPlaceholderConfigurer  gt       lt property name  location  gt  lt value gt my config properties lt  value gt  lt  property gt       lt property name  properties  gt         lt props gt           lt prop key  entry 1  gt 123 lt  prop gt         lt  props gt       lt  property gt     lt  bean gt

User · Answer

The default value can be followed with a   after the property key  e g      lt property name  port  value    my server port 8080     gt    Or in java code     Value    my server port 8080    private String myServerPort    See     valueSeparator   from AbstractPropertyResolver  and VALUE SEPARATOR  from SystemPropertyUtils    BTW  the Elvis Operator is only available within Spring Expression Language  SpEL   e g   https   stackoverflow com a 37706167 537554

User · Answer

Also i find another solution which work for me  In our legacy spring project we use this method for give our users possibilities to use this own configurations    lt bean id  appUserProperties  class  org springframework beans factory config PropertiesFactoryBean  gt       lt property name  ignoreResourceNotFound  value  false   gt       lt property name  locations  gt           lt list gt               lt value gt file   conf user properties lt  value gt           lt  list gt       lt  property gt   lt  bean gt    And in our code to access this properties need write something like that    Value    appUserProperties userProperty    private String userProperty   And if a situation arises when you need to add a new property but right now you don t want to add it in production user config it very fast become a hell when you need to patch all your test contexts or your application will be fail on startup   To handle this problem you can use the next syntax to add a default value    Value    appUserProperties get  userProperty     default value     private String userProperty   It was a real discovery for me

[java] Is there a way to specify a default property value in Spring XML?

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