In Eclipse: Could not find or load main class org.testng.remote.RemoteTestNG

Question

Configuration

I have version 2019-12 (4.14.0) of Eclipse (having recently upgraded from 2019-03) with the following plugins installed (amongst others):

TestNG 6.14.3.201902250526
TestNG M2E (Maven) Integration (Optional) 6.14.3.201902250526
TestNG P2 Features 6.14.3.r201802240500

Eclipse is running against jdk1.8.0_152.

In Eclipse, my Java Build Path includes testng-6.14.3. I've tried to match the Eclipse plugin version against the version using in the project.

Under Properties -> TestNG I have all the default settings. There is no setting here for "Use Project TestNG.jar".

What Works

When I run tests from the command line with Gradle they all pass with no issue.

There are no complile errors showing in Eclipse.

What Does Not Work

When I run a test from Eclipse (by right clicking on a class) the console shows:

Error: Could not find or load main class org.testng.remote.RemoteTestNG

It appears I need a copy of testng-remote.jar. Should this have been installed as part of the plug-in, or am I meant to have included that in my build.gradle as a dependency?

Why can't I run tests from Eclipse? Do I need to install something further to resolve this error?

What I have Tried

I have tried removing and re-installing the TestNG plugin.

Answer 1

It seems you hit the bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=558495 in Windows. I reverted my version back to 2019-09 because of it.

The bug causes jars which should be on the classpath not to be on the classpath. This affects projects with long classpaths.