Consider the following classes and interfaces:
public interface Foo {
public void method();
}
public abstract class AbstractFoo implements Foo { }
public class SomeFoo extends AbstractFoo {
public void method() {}
}
Compile this. Then change SomeFoo:
public class SomeFoo extends AbstractFoo {
public void method() throws Exception {}
}
You'll get a compiler error since Foo.method() doesn't throw Exception.
Change Foo:
public interface Foo {
public void method() throws Exception;
}
Information about the abstract methods inherited from Foo is apparently
stored in AbstractFoo, so AbstractFoo now needs to be recompiled -- but
IDEA doesn't realize this so ctrl-f9 will just give you the same
compiler error again and again until you rebuild the entire project or
realize there's an abstract intermediate class and recompile it manually.
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