Using multiple property files via PropertyPlaceholderConfigurer in multiple projects modules

Question

We are currently writing an application which is split into multiple projects modules  For example  let s take the following modules    myApp-DAO myApp-jabber   Each module has its own Spring context xml file  For the DAO module I have a PropertyPlaceholderConfigurer which reads a property file with the necessary db connection parameters  In the jabber module I also have a PropertyPlaceHolderConfigurer for the jabber connection properties   Now comes the main application which includes myApp-DAO and myApp-jabber  It reads all the context files and starts one big Spring context  Unfortunately it seems like there can only be one PropertyPlaceholderConfigurer per context  so whichever module gets loaded first is able to read it s connection parameters  The other one throws an exception with an error like  Could not resolve placeholder  jabber host    I kind of understand what the problem is  but I don t really know a solution - or the best practice for my usecase   How would I configure each module so that each one is able to load its own property file  Right now I ve moved the PropertyPlaceHolderConfigurer out of the seperate context files and merged them into the main application s context  loading all property files with a single PropertyPlaceHolderConfigurer   This sucks though  because now everyone who uses the dao module has to know  that they need a PropertyPlaceHolderConfigurer in their context    also the integration tests in the dao module fail etc   I m curious to hear about solutions ideas from the stackoverflow community

User · Answer

You can have multiple  lt context property-placeholder   gt  elements instead of explicitly declaring multiple PropertiesPlaceholderConfigurer beans

User · Answer

I know that this is an old question  but the ignore-unresolvable property was not working for me and I didn t know why   The problem was that I needed an external resource  something like location  file   CATALINA HOME  conf db-override properties   and the ignore-unresolvable  true  does not do the job in this case    What one needs to do for ignoring a missing external resource is   ignore-resource-not-found  true    Just in case anyone else bumps into this

User · Answer

I tried the solution below  it works on my machine    lt context property-placeholder location  classpath  connection properties  ignore-unresolvable  true  order  1    gt    lt context property-placeholder location  classpath  general properties  order  2   gt       In case multiple  elements are present in the   Spring context  there are a few best practices that should be   followed       the order attribute needs to be specified to fix the order in which   these are processed by Spring all property placeholders minus the last   one  highest order  should have ignore-unresolvable    true    to allow   the resolution mechanism to pass to others in the context without   throwing an exception   source  http   www baeldung com 2012 02 06 properties-with-spring

User · Answer

The PropertiesPlaceholderConfigurer bean has an alternative property called  propertiesArray    Use this instead of the  properties  property  and configure it with an  lt array gt  of property references

User · Answer

If you ensure that every place holder  in each of the contexts involved  is ignoring unresolvable keys then both of these approaches work  For example      lt context property-placeholder location  classpath dao properties            classpath services properties            classpath user properties  ignore-unresolvable  true   gt    or       lt bean id  propertyConfigurer  class  org springframework beans factory config PropertyPlaceholderConfigurer  gt           lt property name  locations  gt               lt list gt                   lt value gt classpath dao properties lt  value gt                   lt value gt classpath services properties lt  value gt                   lt value gt classpath user properties lt  value gt               lt  list gt           lt  property gt            lt property name  ignoreUnresolvablePlaceholders  value  true   gt       lt  bean gt

[java] Using multiple property files (via PropertyPlaceholderConfigurer) in multiple projects/modules

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