I see following in Spring Boot application.properties file. What is it doing here:
spring.datasource.password = ${DB_PASSWD:password}
It means try resolving DB_PASSWD property. If found, use it's value. If not, use the default provided value password. In short:
${property:defaultValue}
The property value is looked up from property sources registered in Spring context, see Environment.getProperty() and #PropertySource.
Related
When using Spring Cloud config server, I have observed the below behavior. Please let me know, if my hypothesis is correct regarding the behavior.
If the application-${env}.yaml/properties have the server.port property set, I cannot override the value, even by passing -Dserver.port
If I do not inherit the property defined in the spring cloud config, then I will be able to provide the value inside the application.yaml/property of the application
If the property is defined inside the application's application.property/yaml, I can override the value from the command line by passing the -Dserver.port option.
Is my assumptions right based on the above behavior.
Yes, spring cloud config value can't overwrite by default . We can change to override with property pring.cloud.config.allowOverride=true
https://cloud.spring.io/spring-cloud-static/spring-cloud.html#overriding-bootstrap-properties
I was wondering if we can supply a custom attribute (a key to be in application.properties file), I know for sure that -Dserver.port=8080 works, and overrides the property value, but server.port is a spring boot's expected property value.
How about something other than that, for example a jdbc connection string or service name? does -Ddb.service.name=dbservice work?
Yes, any property can be set via system property. You can use -D or -- notation. There are also a variety of property sources Spring Boot uses:
https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html
I want to do encryption for some sensitive data in application.properties file of spring boot application.
for that I have used jasypt-spring-boot-starter plugin .
also used #EnableEncryptableProperties tag on spring application.
I have encrypted access key for my database and written its encrypted value in the property file.
com.test.SharedAccessKey=ENC(vfQQ9veC1G+RV8BC0VA==)
also provided in property file
jasypt.encryptor.password=secretpassword
jasypt.encryptor.algorithm=PBEWithMD5AndDES
I am accessing this property in spring boot application as followes
#Value("${com.test.SharedAccessKey}")
public String shareAcessKey;
But logger.info(shareAcessKey) print as it is ENC(vfQQ9veC1G+RV8BC0VA==)
what I am missing in above , can anyone help.
Issue was resolved . I have done some configuration in my spring Configuration class #Configuration related to property file.
as set property place holder configure to setIgnoreUnresolvablePlaceholders
after removing above code . Jasypt password is got picked up.
Can expressions be used as a right-hand-side value in a Spring application.properties file?
For example, something like this:
logging.level.com.acme=#{'${MY_RUN_ENV}'=='PROD'?'WARN':'DEBUG'}
That, specifically, does not work. But, I'm wondering if I can do something similar to what's intended there
No you can not use SpEL within properties files.
Finally, while you can write a SpEL expression in #Value, such
expressions are not processed from Application property files.
You can however use placeholders within properties files, eg:
app.name=MyApp
app.description=${app.name} is a Spring Boot application
For your use case, you should look at the profile-specific configuration mechanism.
Which allows you to load different config based on an environment profile.
No this is not possible, From spring boot reference:
Feature #ConfigurationProperties
SpEL evaluation No
Instead you can have an application-default.properties in production and in it define loglevel=WARN.
And in your application.properties:
loglevel=DEBUG
logging.level.com.acme=${loglevel}
The profile-specific properties file(-default by default) should override the properties from application.properties, more info here.
Use profile based properties file.
In application-dev.properties :
logging.level.com.acme=WARN
and in application-prod.properties :
logging.level.com.acme=DEBUG
FYI when spring boot doesn't find a propertie in a profile based file it use the value in the default one . So you can set properties in application.properties and override them in a profile based file when their value changed.
Can I use a propertie inside a application.properties?
sample:
myLevel=ERROR
logging.level.org.springframework=$myLevel
logging.level.org.apache.catalina=$myLevel
tks
You might use property placeholders:
The values in application.properties are filtered through the existing Environment when they are used so you can refer back to previously defined values (e.g. from System properties).
For your case:
myLevel=ERROR
logging.level.org.springframework=${myLevel}
logging.level.org.apache.catalina=${myLevel}
See also:
Spring Boot - Placeholders in properties