How to fix the error: test source folder 'src/test/java' in project must have an output folder that is not also used for main source"?

Question

I have installed mahout and I have imported the existing maven project apache-mahout-distribution-0.12.2 to Eclipse IDE for Java Developers and can not build and I couldn't fix these problems. Please share me your knowledge!

This issue seems related: https://github.com/eclipse/eclipse.jdt.ls/issues/1635 — tangens, Oct 17 '21 at 17:58

score 6 · Answer 1 · answered Jul 16 '20 at 20:41

I had the same problem a couple of minutes ago. I tried some options as listed below and nothing happened:

Changing the output folder specific for test class
Changing the option 'Contains test sources' from no to yes and vice-versa
Excluding all source folders on build path

My solution: I removed the project from my workspace and a new one was created.

Furthermore infomation about Test Source configuration at Eclipse, https://www.eclipse.org/eclipse/news/4.8/jdt.php#jdt-test-sources

What you mean by I removed from workspace and new one was created, who creates it? Mystical powers? — Meric Ozcan, Mar 01 '23 at 11:38

Jan Hrabowski · Answer 2 · 2019-01-10T03:06:41.607

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I had similar issue and had to type-in the name of the output folder directly in the .classpath as follows

<classpathentry kind="src" output="target/test-classes" path="src/test/java"/>

Note that 'contains test source' on Java Build Path panel should be set to 'Yes'. Once I did that and refreshed the output became visible in the Java Build Path panel.

edited Jan 10 '19 at 03:06

answered Jan 10 '19 at 02:59

Jan Hrabowski

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score 2 · Answer 3 · answered Sep 21 '22 at 14:28

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I had this problem and solved it as follows:

Right-click on project, Properties -> Java Build Path -> Source
Tick the "Allow output folders for source folders" checkbox
Now you can double-click on "Output folder" and set it per source folder path.

answered Sep 21 '22 at 14:28

simonalexander2005

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score -1 · Answer 4 · answered Jul 31 '18 at 09:48

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Surely it will be enough to open project's Java Build Path, focus the src/test/java folder and set its output folder as <project>/target/test-classes.

answered Jul 31 '18 at 09:48

Little Santi

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There is no separate output folder for test sources in my version. – Sridhar Sarnobat Jan 15 '20 at 23:09
@SridharSarnobat Strange that Jan Hrabowski's answer worked for you, and not mine, while both of them are doing the same in different ways. – Little Santi Jan 16 '20 at 10:04

How to fix the error: test source folder 'src/test/java' in project must have an output folder that is not also used for main source"?

4 Answers4