Can I pass variable in @Value annotation to read a property file, whose key is stored in a String variable?

Question

Can I get the value from a properties file where the value of the key to properties file entity is stored in a variable (contants Class)?

Structure is like: properties file

x.y.z=123

Constant file

public static final String abc = "x.y.z";

Service class like

@Value(${"getConstant("abc").getValueOfProperty()})
public String resource;

Here I don't only want to read the value from the constants class. The transfer of values is taking place two times here. — Saksham Goel, Jan 17 '20 at 06:12
As long as the `String` variable is final, you can use it in `@Value` annotation. — pkgajulapalli, Jan 17 '20 at 06:13
Structure is like: properties file--- x.y.z=123 Constant file== public static string abc = "x.y.z" Service class like --- @Value(${"getConstant("abc").getValueOfProperty()}) — Saksham Goel, Jan 17 '20 at 06:15
As the variable `abc` is not final, you can't use it in @Value. — pkgajulapalli, Jan 17 '20 at 06:16
sorry, that was a typo. the variable abc is final too, but in a different class. — Saksham Goel, Jan 17 '20 at 06:24
In that case, you can directly use `@Value("${" + Constants.abc + "}")` — pkgajulapalli, Jan 17 '20 at 06:28
in that case it is giving me the value of the constant, not the value to which it corresponds to in property file — Saksham Goel, Jan 17 '20 at 06:33
The application must be looking for a different properties file. You can use `@PropertySource(value = "classpath:YOUR_PROPERTY_FILE")` over the Service class to specify the property file. Make sure the property file is in classpath. — pkgajulapalli, Jan 17 '20 at 06:38

score 0 · Answer 1 · answered Jan 17 '20 at 06:15

0

I think, we can do like,

private final String VALUE_STRING = "${external.value:default}";
@Value(VALUE_STRING)
private String value;

answered Jan 17 '20 at 06:15

Vivek

1 Answers1