In order to solve this error, you must know how Java find and loads the classes, that's a little bit complex topic for beginners, but we will touch the same base here. Java ClassNotFoundException occurs when the application tries to load a class but Classloader is not able to find it in the classpath. # Compile Java source code C:\projects> javac HelloWorld.java C:\projects> dir 15/04/2019 01:20 PM 425 HelloWorld.class 15/04/2019 01:42 PM 138 HelloWorld.java # Run Java C:\projects>java HelloWorld.class Error: Could not find or load main class HelloWorld.class Caused by: java.lang.ClassNotFoundException: HelloWorld.class August 14, 2019. Classname without fully qualified classname; 2. 4. 3. So, again, let's run our program using the correct class name: $ java HelloWorld Hello world..!!! Inclusion of .class extension − While executing a file there is no need to include the .class extension in your program you just need to specify the name of the class file. Java Package Names Java ClassNotFoundException. You have put .java as suffix. All of your programs were running perfectly fine. This indicates that we were trying to load the class definition, and the class did not … You have put the wrong directory on the classpath; 3. But to run a .class file, we need to provide the class name, not the file name. 2. Solution; Assuming you have a java project and is using Visual Studio Code as IDE. ClassNotFoundException occurs when you try to load a class at runtime using Class.forName() or loadClass() methods and requested classes are not found in classpath. java.lang.ClassNotFoundException This exception indicates that the class was not found on the classpath. Not able to find class due to subdirectory path. D:\>java EXAMPLE Error: Could not find or load main class EXAMPLE Caused by: java.lang.NoClassDefFoundError: Example (wrong name: EXAMPLE) Solution − In this the class name is with wrong case it, it should be decorated. Suddenly, you ran a main class and you encountered with this error: Error: Could not find or load main class HelloWorld comes when you are trying to run your Java program using java command with the main class as HelloWorld but Java is not able to find the class. D:\sample>java Calculator.class Error: Could not find or load main class Calculator.class Caused by: java.lang.ClassNotFoundException: Calculator.class How to solve java issue - could not load main class - Visual Studio Code. Most of the time this exception will occur when you try to run application without updating classpath with JAR files. 1. However, directly invoking java … Incorrect case; 5. You have put .class as suffix. D:\>javac Example.java D:\>java Example This is an example class ; Common causes of java.lang.ClassNotFoundException are using Class.forName or ClassLoader.loadClass to load a class by passing String name of a class and it’s not found on the classpath. Could not find main class. So there is no need to provide the .class extension: $ java HelloWorld.class Error: Could not find or load main class HelloWorld.class. The java command was not able to locate the class … The message ‘Could not find or load main class’ means that the first step of the Java engine fetching the class for execution has failed. When running the Java program by clicking "Run" on top of the static main function, it reports "Could not find or load the main class: xxx". 1. 4. A typo; Could not load main class.
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