Java Package Names 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". 4. Solution; Assuming you have a java project and is using Visual Studio Code as IDE. You have put .java as suffix. So, again, let's run our program using the correct class name: $ java HelloWorld Hello world..!!! D:\sample>java Calculator.class Error: Could not find or load main class Calculator.class Caused by: java.lang.ClassNotFoundException: Calculator.class But to run a .class file, we need to provide the class name, not the file name. You have put the wrong directory on the classpath; 3. 3. So there is no need to provide the .class extension: $ java HelloWorld.class Error: Could not find or load main class HelloWorld.class. Incorrect case; 5. 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. The java command was not able to locate the class … 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. A typo; Could not load main class. D:\>javac Example.java D:\>java Example This is an example 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. Suddenly, you ran a main class and you encountered with this error: August 14, 2019. 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. 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. 1. 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. 4. Java ClassNotFoundException. All of your programs were running perfectly fine. You have put .class as suffix. However, directly invoking java … Not able to find class due to subdirectory path. This indicates that we were trying to load the class definition, and the class did not … How to solve java issue - could not load main class - Visual Studio Code. Classname without fully qualified classname; 2. ; 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. # 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 Most of the time this exception will occur when you try to run application without updating classpath with JAR files. Java ClassNotFoundException occurs when the application tries to load a class but Classloader is not able to find it in the classpath. Could not find main class. 1. 2. java.lang.ClassNotFoundException This exception indicates that the class was not found on the classpath.
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