How To Fix Error Java Lang Noclassdeffounderror

How to Fix java.lang.NoClassDefFoundError The java.lang.NoClassDefFoundError in Java is a common, yet frustrating error that arises when the Java Virtual Machine (JVM) cannot find a class definition at runtime, even though it was available during compile time. This means the class was present when the code was compiled, but is missing when the program is executed. Understanding the causes and implementing the correct solutions is crucial for maintaining stable Java applications. ...

January 1, 2026 · 5 min · 974 words · Editorial Team