13/07/2025
Hello Friends in this live session i discussed about Difference Between ClassNotFoundException & NoClassDefFoundError
ClassNotFoundException:
This Occurs when JVM tries to load a class which is not present in class path .
Can be caught and handled programmatically.
Scenarios :
* Incorrect package name specified.
* Misspelled class name in code.
* Missing dependency JAR files.
* Dynamically loading class using reflection . (Class.forName)
NoClassDefFoundError :
This occurs when class was present in compile time but not present at Runtime.
Difficult to handle programmatically.
Scenarios :
* Class path misconfiguration
* JAR file not included in the classpath
* External dependencies missing at runtime
* Class file deleted or moved after compilation.
| Feature | ClassNotFoundException | NoClassDefFoundError |
| --------------- | ------------------------------------------- | ------------------------------------------------------------- |
| Type | Checked Exception | Unchecked Error |
| When it occurs | When loading class dynamically | When class was present at compile time but missing at runtime |
| Common cause | Wrong class name or class not in classpath | Class removed or not present in runtime classpath |
| How to fix | Check `Class.forName()` input and classpath | Ensure class is in runtime classpath |
| Example trigger | `Class.forName("com.example.X")` | `new SomeClass()` (if missing at runtime) |
π¨βπ» Java Interview Questions for Freshers (Basic Level Java Interview Questions And Answers):
π‘ FAQs:
1. What are the common Java Interview Questions for Freshers?
Expect basic questions on Java fundamentals, Core Java, Java Collections, object-oriented programming, data types, and exception handling.
2. How do I prepare for Java Coding Interview Questions?
Practice Java coding questions, focusing on algorithms, data structures, and problem-solving, while reviewing Core Java questions as they form the foundation.
3. What should I focus on for Java Interview Questions for Experienced candidates?
For experienced roles, focus on advanced topics like Java 8, multithreading, design patterns, and performance optimization.
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