Compiler errors in IDE for Unsafe

In the hollow subproject I get a handful of compiler errors regarding the use of sun.misc.Unsafe. For example:

Access restriction: The type 'Unsafe' is not API
Access restriction: The method 'Unsafe.getLong(Object, long)
…

For me this happens after a pristine import into Eclipse. It may fail for other IDEs.

[kineshsatiya]

Upon running gradle build in hollow subproject using intelliJ IDE, I get a couple of warnings.

Unsafe is internal proprietary API and may be removed in a future release
import sun.misc.Unsafe;

Another issue, that I see, errors in my IDE in project hollow-diff-ui

hollow/hollow-diff-ui/src/tools/java/com/netflix/hollow/diff/ui/DiffUITest.java:3: error: package org.junit does not exist
import org.junit.Test;
                ^
hollow/hollow-diff-ui/src/tools/java/com/netflix/hollow/diff/ui/DiffUITest.java:6: error: cannot find symbol import com.netflix.hollow.diffview.FakeHollowDiffGenerator;

I was able to get Eclipse working by changing "Forbidden Reference" to Warning under Java Compiler → Errors/Warnings → Deprecated and restricted API