trying to read env variables to custom properties file not in application.property in spring boot

Question

I am trying to read some credentials from env variables in custom.properties file but it's not able to recognize code for my properties file given below but it's not working the way I am fetching env variable like this "${varName}"

org.apache.ws.security.crypto.provider=org.apache.wss4j.common.crypto.Merlin
# Type - Valid Keystore Type. Eg - pkcs12 , jks   
org.apache.ws.security.crypto.merlin.keystore.type=jks
# Keystore Password 
org.apache.ws.security.crypto.merlin.keystore.password=${keystorePassword}
# Keystore Private Password
org.apache.ws.security.crypto.merlin.keystore.private.password=${keystorePassword}
# Keystore Alias
org.apache.ws.security.crypto.merlin.keystore.alias=${keystoreAlias}
# Keystore File Name
org.apache.ws.security.crypto.merlin.keystore.file="something.jks"

can someone please help me out how to get env variables to custom.properties file and

Answer 1

Kindly try with the below sample code .

it reads properties from custom properties file and with prefix value . for eg :Below example reads value from properties with the key of org.apache.ws.security.crypto.provider

@Configuration
@PropertySource(value = "classpath:<properytfilename>.properties")
@ConfigurationProperties(prefix = "org.apache.ws.security.crypto")
public class CustomProperties {

    private String provider;

}

Answer 2

Use java.util.Properties

....
@Value("${what.ever.env}")
private String keystorePassword;

...
            Properties properties = new Properties();
            properties.setProperty("org.apache.ws.security.crypto.provider", "org.apache.wss4j.common.crypto.Merlin");
            properties.setProperty("org.apache.ws.security.crypto.merlin.keystore.password", keystorePassword);


            File file = new File("custom.properties");
            FileOutputStream fileOut = new FileOutputStream(file);
            properties.store(fileOut, "Comment here");
            fileOut.close();
...