Error
Invalid '@FunctionalInterface' annotation; <BuggyBread> is not a functional interface
while using Functional Interface Annotation in Java 8.
Error Type
Compile Time
Sample Code
@FunctionalInterface
public interface BuggyBread {
abstract void method1();
abstract void method2();
}
Cause
BuggyBread is not a Functional Interface. A functional Interface should have one and only one abstract method. It may have multiple default methods.
Resolution
Remove abstract method method1() or method2()
@FunctionalInterface
public interface BuggyBread {
abstract void method1();
}
Invalid '@FunctionalInterface' annotation; <BuggyBread> is not a functional interface
while using Functional Interface Annotation in Java 8.
Error Type
Compile Time
Sample Code
@FunctionalInterface
public interface BuggyBread {
abstract void method1();
abstract void method2();
}
Cause
BuggyBread is not a Functional Interface. A functional Interface should have one and only one abstract method. It may have multiple default methods.
Resolution
Remove abstract method method1() or method2()
@FunctionalInterface
public interface BuggyBread {
abstract void method1();
}