Spring 4, MongoDB, using @Value in MongoConfiguration

Question

I use a MongoConfiguration class to setup my Sping 4 MongoDB. I want to read properties from application.properties so I use @Value:

....
@Configuration
@EnableMongoRepositories
@ComponentScan(basePackageClasses = {Application.class})
public class MongoConfiguration extends AbstractMongoConfiguration {

   @Value("${mongodb.host}")
   String mongodb_host; 

   @Value("${mongodb.port}")
   int mongodb_port; 

   @Value("${mongodb.databasename}")
   String mongodb_databasename; 

   @Override
   protected String getDatabaseName() {
      return mongodb_databasename;
   }

   @Override
   public Mongo mongo() throws Exception {
      return new MongoClient( mongodb_host, mongodb_port );
   }

   @Override
   protected String getMappingBasePackage() {
      return "com.example.mongodb01";
   }
}

This works fine for a web application -- but when I try the same idea in a command line Java application it fails (it's as if the application.properties was found but @Value never ran). I know I am reading the applications.properties file OK. It must have something to do with the differences in running in a servlet container vs. an application but after much searching and trials I have not been able to resolve this and fix it. I would appreciate any help on this -- Thank you!

I did see a similar question and I tried adding the below to my MongoConfiguration but still had the same problem:

@Bean
public static PropertySourcesPlaceholderConfigurer propertyPlaceholderConfigurer() {
  return new PropertySourcesPlaceholderConfigurer();
}

ikumen · Accepted Answer · 2014-05-08 22:14:09Z

1

Did you include the @PropertySource

@Configuration
@PropertySource("classpath:application.properties")
@EnableMongoRepositories
@ComponentScan(basePackageClasses = {Application.class})
public class MongoConfiguration extends AbstractMongoConfiguration {
   ...

answered May 8, 2014 at 22:14

ikumen

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2 Comments

Matt M. Over a year ago

Adding @PropertySource("classpath:application.properties") fixed it. It's interesting that it worked OK on the web app without PropertySource. So in the end I needed PropertySource and the Bean mentioned above for the non-web app but not for web apps.

Matt M. Over a year ago

I wonder if @Value is the best way to do this or if I should be using Environment env.getProperty() -- anyone with ideas on that please comment!

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