Allow @ConditionalOnProperty NOT to match if the property value is empty

In my opinion @ConditionalOnProperty should be behave like @ConditionalOnExpression("!'${some.property:}'.empty")

If property is present but value is empty should be equal like there’s no property or at least there should be a flag which enables such behaviour

Issue Analytics

State:
Created 4 years ago
Reactions:2
Comments:9 (5 by maintainers)

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1reaction

wilkinsonacommented, May 7, 2019

We can’t change the current behaviour to match your expectation as it would be a breaking change. To provide the behaviour that you want, we would have to add an attribute to @ConditionalOnProperty to enable it so that you could opt in and so that existing use of @ConditionalOnProperty would be unaffected.

You have a couple of options with what’s currently available:

Use havingValue to restrict the value that the condition will match
Set the property value to false

If these don’t meet your needs then a custom condition may be your best option as I am still not convinced that we want the added complexity of another attribute.

0reactions

wilkinsonacommented, May 8, 2019

Thanks again for the suggestion. We’ve discussed this today and the team’s opinion is that we don’t want the extra complexity of an additional attribute. To get the functionality that you want, you should write a custom condition as described in the Stack Overflow issue to which you have linked above.

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