Juergen Hoeller opened SPR-9640 and commented

http://openjdk.java.net/jeps/126

Consider marking all applicable Spring callback interfaces with Java 8's @FunctionalInterface. Even if that marker basically just works as a compiler assertion along the lines of @Override, it might still be worth using it consistently as a formal documentation measure. Applicable Spring interfaces can then by found by that marker and will be documented as such in javadoc.

This issue is a sub-task of #14273

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