static import only from classes and interfaces

Question

My code compiles fine in Eclipse, but when I try to compile from the commandline (via our ruby-based buildr system), I get this error message:

static import only from classes and interfaces

Suggesting that static import of public static fields is not permitted. What should I look for to help diagnose this problem? How can I fix it?

Update: per @Ted's request, the constant declaration in the referenced file:

public static final String NULL = "<NULL>";

and the (bowdlerized) reference in the referring file:

import static my.path.MyClass.NULL;

Please post the code that generates this message -- both the import statement and the field(s) being imported. — Ted Hopp, Aug 02 '12 at 16:47

Ted Hopp · Answer 1 · 2019-07-11T19:47:04.187

28

My guess is that Eclipse and buildr are using either different Java compiler versions or different compiler flags. There's a bug in the Java 7 compiler (bug ID: 715906) that generates this error when you statically import specific fields. The work-around is to use a wildcard static import. So instead of:

import static pkg.Class.staticField;

do this:

import static pkg.Class.*;

edited Jul 11 '19 at 19:47

answered Aug 02 '12 at 16:52

Ted Hopp

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score 11 · Answer 2 · answered Nov 13 '13 at 17:25

Late answer but I just got a similar issue and figured it out. I'll post in case it helps anyone else who finds this page...

I got a similar error when, after a big merge and refactor, I accidentally put a test class into src/main/java instead of src/test/java. Since the JUnit dependency was scope=tests, it didn't work in pure maven. Maybe you are having the same issue

score 7 · Answer 3 · answered Nov 14 '18 at 19:03

I also had this error and my issue turned out to be a wayward static import of a junit 4 package in my test source file.

I had the following:

import static org.junit.Assert.fail;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTimeout;

I removed the import static org.junit.Assert.fail; (no idea how I managed to get that in there in the first place) and all is now working.

score 1 · Answer 4 · answered Aug 19 '18 at 08:29

1

I accidentally set test directory as source. And Test sources were considered as source files.

sourceSets.main.java.srcDirs 'src'

| -- src
| -- main
| -- test

Fix:

sourceSets.main.java.srcDirs 'src/main'

answered Aug 19 '18 at 08:29

VenomVendor

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where did you set this property? which file? – ever alian Jan 16 '22 at 21:32
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@everalian this goes in build.gradle inside `android { }` block – VenomVendor Jan 17 '22 at 17:36

score 1 · Answer 5 · answered Mar 28 '23 at 21:20

This is not the most likely cause, but did the trick for me. I've seen this error message that was caused from cached data that wasn't removed properly during code changes (like moving constants from one file to another).

In this case, simply clean the project and rebuild it from scratch. This will take away stale cached data that's causing this compile error.

score 0 · Answer 6 · answered Jan 25 '23 at 09:42

0

Some how same solution mentioned by @m-watson

I have replaced

import static org.junit.Assert.assertThrows;

With

import static org.junit.jupiter.api.Assertions.assertThrows;

and it worked

answered Jan 25 '23 at 09:42

Alireza Fattahi

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static import only from classes and interfaces

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