How to create spring property programatically?

Question

I can easily create new property by adding it to yml or properties file: my.custom.property=5. but how can i do the same from the code? sth like:

@SomeSpringAnnotation("my.custom.property")
fun myFun() = 5

or

registerProperty("my.custom.property", 5)

@Zorglube i coulnd't find such spring class. can u plz elaborate or give a few lines of code? — piotrek
– piotrek, Commented Oct 23, 2020 at 9:16
You can through reload properties method to realize change property value in runtime.How to hot-reload properties in Java EE and Spring Boot? — TongChen
– TongChen, Commented Oct 23, 2020 at 9:27

Michal · Accepted Answer · 2020-10-23 10:11:27Z

1

Adding @PropertySource with custom factory allows for creating dynamic PropertySource.

I did not try it though. Ii might also be evaluated too late for some properties. I personally also think it is not very good idea to create properties dynamically. Customizing the code which is using the property would be better solution IMO.

Another approach would be using @Value with EL expression along the lines of @Value("#{someBean.someValue}").

edited Oct 23, 2020 at 10:11

answered Oct 23, 2020 at 9:25

Michal

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pigman · Accepted Answer · 2020-10-23 09:00:25Z

0

programatically?i don't think it's meaningful! what's the difference between a programatical property and a constant?

if you want to create a property advanced, the default-value expression of Value annotation is a good way.eg.@Value("${my.custom.property:5}") private int myCustomProperty;

answered Oct 23, 2020 at 9:00

pigman

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4 Comments

piotrek Over a year ago

because instead of 5 it can be complexRuntimeComputation()

piotrek Over a year ago

i think what you show is property autowiring, not property creation

Michal Over a year ago

@piotrek - @Value can evaluate an expression using EL with the # syntax, e.g. @Value("#{someBean.someValue}") .

pigman Over a year ago

why don't you call the method instead of property creation ?im sorry that i still don't know what you want to do.how about Cache with annotation of PutCache and Cachable?

akuma8 · Accepted Answer · 2020-10-23 09:10:32Z

0

Have a look at, System.setProperty(...) or System.setProperties(), those methods can be used to set properties at runtime.

answered Oct 23, 2020 at 9:10

akuma8

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1 Comment

piotrek Over a year ago

but is there a way to just create a spring property and not to polute env with new env variables?

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