Spring Configuration file not reading values from application.properties

Question

The start of my Configuration file with path src/main/java/{package name}/DataBaseConfiguration.java:

@Configuration @PropertySource("classpath:application.properties") public class DataBaseConfiguration { private static final Logger LOGGER = LoggerFactory.getLogger("DataBaseConfiguration.class"); @Value("${tenantdb.driver.classname}") static String tenantDbDriverClassname; @Value("${tenantdb.url}") static String tenantDbUrl; @Value("${tenantdb.username}") static String tenantDbUsername; @Value("${tenantdb.password}") static String tenantDbPassword;

My application.properties file with path src/main/resources/application.properties:

tenantdb.driver.classname=org.postgresql.Driver tenantdb.url=jdbc:postgresql://127.0.0.1:5000/tenant_db tenantdb.username=tenant_admin_user tenantdb.password=postgres tenantdb.connectionpool.initialSize=3 tenantdb.connectionpool.maxActive=25 tenantdb.connectionpool.maxIdle=25 tenantdb.connectionpool.minIdle=1

I am using gradle to build the project. I convert things into a JAR and run the JAR as $java -jar /path/to/jar. The code executes and runs and all my print debugging statements are logged. However the values of my variables are all null i.e. things are not being read from the properties file.

I have made sure that the application.properties file is in the JAR.

Files in archive integrity-check-service.jar

META-INF/ META-INF/MANIFEST.MF BOOT-INF/ BOOT-INF/classes/ BOOT-INF/classes/com/ BOOT-INF/classes/com/agilysys/ BOOT-INF/classes/com/agilysys/analytics/ BOOT-INF/classes/com/agilysys/analytics/integritycheckservice/ BOOT-INF/classes/com/agilysys/analytics/integritycheckservice/CompareData.class BOOT-INF/classes/com/agilysys/analytics/integritycheckservice/DataBaseConfiguration.class BOOT-INF/classes/application.properties

(There are other files but I haven't printed them all here.)

Does anyone know why this is happening?

You can write a setter() metod for your static field and use @Value annotation with it. Example is here : baeldung.com/spring-inject-static-field — Orçun Çolak
– Orçun Çolak, Commented Apr 8, 2020 at 4:29
@OrçunÇolak No point in even making that stuff static to begin with since the class will only be instantiated once. — SledgeHammer
– SledgeHammer, Commented Apr 8, 2020 at 17:04

SledgeHammer · Accepted Answer · 2020-04-07 23:16:39Z

2

@PropertySource doesn't work with static variables. Get rid of the static keyword.

answered Apr 7, 2020 at 23:16

SledgeHammer

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4 Comments

zoheb siddiqui Over a year ago

Removed static, All values are still null.

SledgeHammer Over a year ago

@zohebsiddiqui did you use EnableConfigurationProperties or declare your PropertySourcesPlaceholderConfigurer bean?

zoheb siddiqui Over a year ago

Actually, changing them to non static fixed it. I forgot to rebuild my Jar. Thank you for your help.

Orçun Çolak Over a year ago

It is not the "@PropertySource" not working it static fields. "@Value" annotation does not work with static fields. See : baeldung.com/spring-inject-static-field

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