You’ve recently upgraded to Java9, most likely using OpenJDK and you’re trying to install some plugins perhaps in Eclipse Oxygen or you’re engaged in some other activity trying to access a repository and you’re getting failures. Perhaps you’ve even tried to install by way of “dragging the button” onto Eclipse and now after restart your installation has become corrupted. What’s even more frustrating is that possibly some repository access seems to work, while others fail. You see messages like trustAnchors parameter must be non-empty and wonder what that means.
What’s the problem?