java lang noclassdeffounderror

Problem java lang noclassdeffounderror

In this blog, we will study how to solve the java lang java lang noclassdeffounderror error. This error mainly occurs if one put the main.java file in the wrong package. The code for the main file is given below:

import graphics.shapes.*;
import graphics.linepoint.*
import graphics.spaceobjects.*;

public class Main {
    public static void main(String args[]) {
        Square s = new Square(2, 3, 15);
        Line l = new Line(1, 5, 2, 3);
        Cube c = new Cube(13, 32, 22);
    }
}

The error that appears while running the above file is also shown below:

Solution

One of the easiest solutions to the above problem is to put the above file in the graphics package. Another step is to add the classpath to the “_test”. Then compile the above file and run it using the java.graphics.Main. 

Another problem can be each class in the software has its own class file after the above code has been compiled. These binary files contain the bytecode that Java uses to carry out your program’s instructions. The NoClassDefFoundError indicates that the classloader, which is in charge of dynamically loading classes, was unable to locate the. The class file for the class that one is attempting to use. In this example, the classloader is java.net.URLClassLoader.

This issue typically indicates that your classpath does not contain the necessary classes since the code would not compile without the requisite classes (unless the classes are loaded using reflection). Keep in mind that each entry in your classpath will be searched by the classloader, specifically java.net.URLClassLoader, for classes in package a.b.c in folder a/b/c/. NoClassDefFoundError can also mean that users are trying to utilize an a.jar file that one compiled against but is lacking a transitive dependency for.

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