spring PropertyPlaceholderConfigurer and context property-placeholder

Question

I have following bean declaration      lt bean      class  org springframework beans factory config PropertyPlaceholderConfigurer  gt           lt property name  locations  gt               lt list gt                   lt value gt WEB-INF classes config properties database properties lt  value gt                   lt value gt classpath config properties database properties lt  value gt               lt  list gt           lt  property gt           lt property name  ignoreResourceNotFound  value  true   gt       lt  bean gt   lt bean id  dataSource  class  org apache commons dbcp BasicDataSource  gt       lt property name  driverClassName  value    jdbc driverClassName     gt       lt property name  url  value    jdbc url     gt       lt property name  username  value    jdbc username     gt       lt property name  password  value    jdbc password     gt   lt  bean gt    Now I want to change above PropertyPlaceholderConfigurer to following format    lt context component-scan base-package  org example config   gt   lt util properties id  jdbcProperties              location  classpath config properties database properties   gt     ignoreResourceNotFound will ignore the property while running  e g  When testing application WEB-INF    path will ignore  since maven project and property file is under src main resources      while launching web application  other property will ignore path  I need to implement same with above format  should be able to add multiple property file like database properties  test properties etc  in Spring 3  can I use annotation instead of these xml files for DB loading  how can I do it  since I am using only one xml file given above  to load db stuff    I am using Spring 3 framework

User · Answer

First  you don t need to define both of those locations  Just use classpath config properties database properties  In a WAR  WEB-INF classes is a classpath entry  so it will work just fine   After that  I think what you mean is you want to use Spring s schema-based configuration to create a configurer  That would go like this    lt context property-placeholder location  classpath config properties database properties   gt    Note that you don t need to  ignoreResourceNotFound  anymore  If you need to define the properties separately using util properties    lt context property-placeholder properties-ref  jdbcProperties  ignore-resource-not-found  true   gt    There s usually not any reason to define them separately  though

User · Answer

Following worked for me    lt context property-placeholder location  file src resources spring AppController properties   gt  Somehow  classpath xxx  is not picking the file

User · Answer

lt context property-placeholder       gt  is the XML equivalent to the PropertyPlaceholderConfigurer  So  prefer that  The  lt util properties  gt  simply factories a java util Properties instance that you can inject    In Spring 3 1  not 3 0     you can do something like this      Configuration  PropertySource   foo bar services properties   public class ServiceConfiguration          Autowired Environment environment         Bean public javax sql DataSource dataSource              String user   this environment getProperty  ds user                           In Spring 3 0  you can  access  properties defined using the PropertyPlaceHolderConfigurer mechanism using the SpEl annotations    Value    ds user    private String user    If you want to remove the XML all together  simply register the PropertyPlaceholderConfigurer manually using Java configuration  I prefer the 3 1 approach  But  if youre using the Spring 3 0 approach  since 3 1 s not GA yet      you can now define the above XML like this    Configuration  public class MySpring3Configuration                 Bean          public static PropertyPlaceholderConfigurer configurer                   PropertyPlaceholderConfigurer ppc                    ppc setLocations                    return ppc                        Bean          public class DataSource dataSource                   Value    ds user    String user                    Value    ds pw    String pw                                       DataSource ds                   ds setUser user               ds setPassword pw                                                       return ds                Note that the PPC is defined using a static bean definition method  This is required to make sure the bean is registered early  because the PPC is a BeanFactoryPostProcessor - it can influence the registration of the beans themselves in the context  so it necessarily has to be registered before everything else

[spring] spring PropertyPlaceholderConfigurer and context:property-placeholder

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