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Asked: 2026-05-19T14:25:10+00:00

I have an issue where NoClasDefFoundError is being thrown. It puzzles me since I

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I have an issue where NoClasDefFoundError is being thrown. It puzzles me since I am using interfaces, and no class definition should be available. I have read through some posts which point to Classpath, but I don’t believe that to be the issue here (although I may be wrong). I am using NetBeans 6.9.1 IDE.

I have created a sample setup to reproduce the issue. Four projects: Interfaces, Objects, Locator and Consumer. Below you will find the implementations.

At runtime consumer coplains about missing SomeObject implementation, which it should not be aware of since it is accepting interface.

Exception in thread “main”
java.lang.NoClassDefFoundError:
objects/SomeObject

What am I missing?

package interfaces;
public interface ISomeInterface { }

package objects;
import interfaces.ISomeInterface;
public class SomeObject implements ISomeInterface{ }

package locator;
import interfaces.ISomeInterface;
import objects.SomeObject;
public class Locator { public static ISomeInterface LocateImplementation() { return new SomeObject(); }}

package consumer;
import interfaces.ISomeInterface;
import locator.Locator;
public class Main { public static void main(String[] args) { ISomeInterface object = Locator.LocateImplementation(); }}
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1 Answer

  1. Editorial Team

    You can get a NoClassDefFoundError exception with interfaces just as you can with classes. Consider the “Class” in the name of the exception to be the .class file that is generated from compiling a class or interface, not a Java class.

    This is saying that the class/interface objects.SomeObject isn’t visible on your classpath. Check the location of that .class file and ensure that it’s on your classpath – if you’re positive it’s there, give us some screen shots or something that might help to debug the problem.

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