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springspring-bootapplication.properties

"java.lang.IllegalStateException: Cannot load driver class" in Spring Boot application

I am using to configure spring boot with an external YAML configuration and CMD.

-> application.yml file

spring:
  profiles: integration-test
  datasource:
    driverClassName: ${SPRING_DATASOURCE_DRIVER_CLASS_NAME}
    url: ${SPRING_DATASOURCE_URL}
    username: ${SPRING_DATASOURCE_USERNAME}
    password: ${SPRING_DATASOURCE_PASSWORD}

-> cmd

mvn clean install

-> Result

Caused by: java.lang.IllegalStateException: Cannot load driver class: ${SPRING_DATASOURCE_DRIVER_CLASS_NAME}

Can anyone explain this to me?

Solution

  • When you use the syntax ${}, you are actually telling Spring Boot to use the value of the property whose name is between brackets. In your case, Spring Boot tries to resolve the property SPRING_DATASOURCE_DRIVER_CLASS_NAME. When it fails, it uses the string as is, which leads to the error you mentioned, since no driver exists under the name ${SPRING_DATASOURCE_DRIVER_CLASS_NAME}.

    To solve the issue, you can either :

    1. replace the ${} by the real values, e.g. driverClassName: org.postgresql.Driver and do the same for the other properties (url, username and password)
    2. provide properties SPRING_DATASOURCE_DRIVER_CLASS_NAME,SPRING_DATASOURCE_URL and the two others. These can passed in the command line with -D options (e.g. -DSPRING_DATASOURCE_DRIVER_CLASS_NAME=org.postgresql.Driver) or through environment variables. You can look at spring Boot documentation for more details.