If your class relies on too many others, it will be coupled and fragile. A long import list is a good indicator.

TL;DR: Don't import too much.

Problems

Coupling
Single Responsibility Principle violation
Low Cohesion

Solutions

Break the class
Hide intermediate accidental implementation

Sample Code

Wrong

import java.util.LinkedList;
import java.persistence;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException 
import java.util.Queue;
import org.fermi.common.util.ClassUtil;
import org.fermi.Data;
//We rely on too many libraries

public class Demo {
   public static void main(String[] args) {

   }
}

Right


import org.fermi.domainModel;
import org.fermi.workflow;

//We rely on few libraries
//and we hide their implementation
//So maybe transitive imports are the same
//but we don't break encapsulation

public class Demo {
   public static void main(String[] args) {

   }
}