Could not resolve Spring property placeholder

Question

I have my config:

Answer 1

It's definitely not a problem with propeties file not being found, since in that case another exception is thrown.

Make sure that you actually have a value with key idm.url in your idm.properties.

Answer 2

make sure your properties file exist in classpath directory but not in sub folder of your classpath directory. if it is exist in sub folder then write as below classpath:subfolder/idm.properties

Answer 3

the following property must be added in the gradle.build file

processResources {
    filesMatching("**/*.properties") {
        expand project.properties
    }
}

Additionally, if working with Intellij, the project must be re-imported.

Answer 4

You may have more than one org.springframework.beans.factory.config.PropertyPlaceholderConfigurer in your application. Try setting a breakpoint on the setLocations method of the superclass and see if it's called more than once at application startup. If there is more than one org.springframework.beans.factory.config.PropertyPlaceholderConfigurer, you might need to look at configuring the ignoreUnresolvablePlaceholders property so that your application will start up cleanly.

Answer 5

Ensure 'idm.url' is set in property file and the property file is loaded

Answer 6

Your property file location is classpath:idm.properties

This is rather unusual, it means that idm.properties must be located either at the top level of WEB-INF/classes or at the top-level of one of the jars inside WEB-INF/lib. Usually it's good practice to either use a dedicated folder for properties or keep them close to the context files that use them.

So my suggestion is this: Is your properties file perhaps next to your context file? If so, it's not on the classpath (see this question: Is WEB-INF in the CLASSPATH?).

The classpath: prefix maps to a ClassPathResource, but you probably need a ServletContextResource, and you'll get that from a WebApplicationContext using the syntax without prefix:

<context:property-placeholder location="idm.properties" />

Reference:

• The ResourceLoader
  (describes how different ApplicationContext types handle resources without prefix)
• The PropertyPlaceholderConfigurer mechanism
  (describes the <context:property-placeholder> mechanism)