Hello,
Maybe this already widely known, but on my machine (Windows 10 x64, JDK8, Eclipse Java 2019-09), when I try to build imagej or scifio from source for the first time directly from the Eclipse GUI, there will be errors during the tests.
Example: checkout a clean copy of ImageJ, import into Eclipse, and then go to pom.xml -> Run As -> Maven build. The test will fail.
When I instead run maven directly from the command line, the build will succeed.

After the initial manual build with maven, also the Eclipse way will start to work.

Here is the initial discussion that prompted me file this bug here: imagej/ImageJ#273