I'm trying to start someof another project on my Eclipse.
import org.eclipse.jetty.websocket.api.extensions.Frame;
import org.eclipse.jetty.websocket.client.ClientUpgradeRequest;
import org.eclipse.jetty.websocket.client.WebSocketClient;
When I use codes " org.eclipse.jetty ", I have an error; The import org.eclipse.jetty cannot be resolved.
How to I fix this problem? Thanks for helping.