Quick Answer

Fix class instantiation failures.

Understanding the Issue

Thrown when trying to instantiate an abstract class or interface. Also occurs when class initialization fails (e.g., static block throws exception).

The Problem

This code demonstrates the issue:

Java Error 
abstract class Animal {}
Animal a = new Animal(); // Error

The Solution

Here's the corrected code:

Java Fixed 
// Solution 1: Instantiate concrete subclass
class Dog extends Animal {}
Animal a = new Dog();

// Solution 2: Fix static initializers
class Problematic {
    static { if (true) throw new RuntimeException(); }
}
// Fix the static initializer block

// Solution 3: Check reflection usage
// Constructor.newInstance() may throw this wrapped in InvocationTargetException

Key Takeaways

Only instantiate concrete classes with valid initialization.