Spring-boot: Validation of @ConfigurationProperties does not happen for nested properties

[dsyer]

E.g. this works:

@ConfigurationProperties("config")
class Props {

    @NotEmpty
    private String value = "";

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

}

this doesn't

@ConfigurationProperties("config")
class Config {
    @NotNull
    // this works
    private Props props = new Props();

    public Props getProps() {
        return props;
    }

    public void setProps(Props props) {
        this.props = props;
    }

    @Validated // shouldn't be necessary, just tried it in case
    public static class Props {

        @NotEmpty
        private String value = "";

        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
        }

    }
}

[dsyer]

This works:

@ConfigurationProperties("config")
class Config {
    @NotNull
    @Valid
    private Props props = new Props();

    public Props getProps() {
        return props;
    }

    public void setProps(Props props) {
        this.props = props;
    }

    public static class Props {

        @NotEmpty
        // doesn't work here
        private String value = "";

        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
        }

    }
}

[spyvip]

@dsyer

why use it here？ but others all wrong.

public static class Props

[philwebb]

@shipengyan I'm not sure I understand the question, but here's not the best place to ask it. We like to keep the issue tracker purely for bugs and enhancements. The issue has also been closed for 2 years.

If have a general question you should ask on http://stackoverflow.com, or you can join us on http://gitter.im.

[kcotzen]

This comment is for people who still face this issue:

For me, the salvation was this:
@ConfigurationProperties("config")
@Validated <---------THIS
class Config {

It wasn't necessary the static class