Using @Value Spring Annotation with Groovy

Question

I have a groovy class where I wan to autowire a property value.

Eg:

public @Value("${valueA}" ) String valueA;

With the addition of the the property-placeholder in my appliction context

<context:property-placeholder location="classpath:spring/app.properties" />

The app.properties has a value set for "valueA" so in theory this should populate the String valueA in my class at runtime.

This setup works perfectly if I use a java class but not if I use a groovy class.

I get a compile error:

Error: expected '$valueA' to be an inline constant of type java.lang.String in @org.springframework.beans.factory.annotation.Value
Error: Attribute 'value' should have type 'java.lang.String'; but found type 'java.lang.Object' in @org.springframework.beans.factory.annotation.Value

I just want to know if the above syntax is correct when using a groovy class and if not what is the correct syntax for autowiring the @Value parameter at runtime.

Thanks for asking this. It was driving me sort of crazy but the answers below do the trick. — Peter N. Steinmetz
– Peter N. Steinmetz, Commented Jun 8, 2014 at 18:08

sourcedelica · Accepted Answer · 2011-04-13 13:07:51Z

87

Use single quotes, ie.

public @Value('${valueA}') String valueA

answered Apr 13, 2011 at 13:07

sourcedelica

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3 Comments

Michael Rutherfurd Over a year ago

Is this because with double quotes you get a GString instead of a String and the substitution is done at the wrong time?

Sion Over a year ago

Thanks, this affected me in my Groovy project. I suspect this doesn't happen in Java as there is no GString type.

BrentR Over a year ago

This seems to work, but not when attempting to use a default value. public @Value('${propertyName:defaultValue}') String valueA In this scenario, 'defaultValue' is always used as the value for propertyName, even when overridden in a property file. The value in the property file is not used.

Andre Steingress · Accepted Answer · 2011-04-14 07:17:41Z

33

since using a $ causes Groovy to interpret the annotation argument as a GString, you get a compile error. you can either escape \$ or use single quotes.

answered Apr 14, 2011 at 7:17

Andre Steingress

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