Intellij, cannot resolve symbol ByteBufferGuard

Question

I have setup a small project, with a small final class ByteBufferGuard in a ByteBufferGuard.java file:

final class ByteBufferGuard {
    @FunctionalInterface
    static interface BufferCleaner {
        void freeBuffer(String resourceDescription, ByteBuffer b) throws IOException;
    }
}

And then another class, MMapDirectory.java. Well, in this class I can't refer to BufferCleaner simply by importing it, because this:

import ByteBufferGuard.BufferCleaner;

returns:

cannot resolve symbol ByteBufferGuard

But it's strange because only ByteBufferGuard is marked red, it does see, instead, what comes next, that is BufferCleaner.

Both classes are located under the same gradle default root package, that is src/main/java/

Looking at similar answers, I already tried to "invalidate caches/restart" and also delete .idea folder and open the project again.. no success so far.

Let's say this is not a blocker, because I can substitute all the references of BufferCleaner with ByteBufferGuard.BufferCleaner, but still it bothers me, so I'd like to solve this issue.

Do you know what could be the problem?

java 1.8 u112

intellij 2017.1 eap

Another interesting fact, is that the very same import using Kotlin works like a charm..

I think you need to import the whole class: `import ByteBufferGuard`. Not 100% sure. — Yogev Levy, Jan 23 '17 at 08:52
@CKing, they are under the same package so it shouldn't matter, however I tried to write `public final class ByteBufferGuard` but unfortunately it doesn't work neither — elect, Jan 23 '17 at 08:57
@YogevLevy, when I type `import ByteBufferGuard`, `ByteBufferGuard` is red. — elect, Jan 23 '17 at 08:57
Try `import static ByteBufferGuard.BufferCleaner;`? Also, is `MMapDirectory.java` in the same package as `ByteBufferGuard`? — Chetan Kinger, Jan 23 '17 at 08:58
@CKing, tried, exactly same result, `ByteBufferGuard` red, but `.BufferCleaner` not. Yes, they are under the same package — elect, Jan 23 '17 at 08:59
Don't hesitate to ask me whatever you think it might be the right information, then :) — elect, Jan 23 '17 at 09:01
You might want to try to copy/paste those two classes and try out yourself. I am curious to know if it works on your machine — elect, Jan 23 '17 at 09:04

score 1 · Accepted Answer · edited May 23 '17 at 12:24

1

Do not use the default package (unnamed package) - if you move both files to a package (subdirectory) it should work.

package some.package;

final class ByteBufferGuard {
    @FunctionalInterface
    static interface BufferCleaner {
        void freeBuffer(String resourceDescription, ByteBuffer b) throws IOException;
    }
}

and

package some.package;

import some.package.ByteBufferGuard.BufferCleaner;

public class MapDirectory {
    private BufferCleaner cleaner;
    // ...
}

(tested with eclipse, but should be the same)

It is not possible to import classes from the default package:

edited May 23 '17 at 12:24

Community

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answered Jan 23 '17 at 09:46

user85421

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downvote without comment will not help improve the answer! – user85421 Jan 23 '17 at 10:04
It was indeed this the problem, thanks Carlos! – elect Jan 23 '17 at 10:30
I +1 (when it was 0), and it's zero again, it looks like someone else also downvoted.. I won't never understand those people.. – elect Jan 23 '17 at 12:32

score 0 · Answer 2 · answered Jan 23 '17 at 09:34

0

Maybe make your class public, or if You want to be a package, make sure, other class who use ByteBufferGuard is in the same package

answered Jan 23 '17 at 09:34

MatWdo

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Intellij, cannot resolve symbol ByteBufferGuard

2 Answers2