Software⏱️ 2 min read📅 2026-05-31

How to Fix: Class Not Found Exception when running JUnit test

The Class Not Found Exception occurs when the JUnit test is unable to locate the specified class.

Quick Answer: Ensure that the class file for MyTest is included in the classpath and that the package name matches the directory structure.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

The Class Not Found Exception occurs when the Java Virtual Machine (JVM) is unable to locate a class file at runtime. In the context of JUnit tests, this error typically arises due to one or more of the following reasons:

🛑 Root Causes of the Error

  • 1. Incorrect Package Name or Class Path:

🚀 How to Resolve This Issue

Method 1: Update Class Path

  1. Step 1: Ensure that the correct package name and class path are specified in your test class.

Method 2: Use Absolute Path

  1. Step 1: When running tests, use the absolute path to locate your test classes.

🎯 Final Words

To avoid this error in JUnit tests, make sure that the package name and class path are correctly specified. You can also try using the absolute path when running your tests.

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