To solve, use the full class name, including package name, in the java command. To avoid this error, you need to specify the absolute (including packages) name of the .class file (just name) which is in the current directory. Wrong class name − You might have specified the wrong class name. But some of the most popular and common errors are often faced by programmers who are new in programming. Developed by JavaTpoint. In the following image, we are not inside the demo folder where the class is located. Also occurs, when we have done a mistake with the class name argument. Once you write a Java program you need to compile it using the javac command, this shows you the compile time errors occurred (if any). It means the DemoClass.class file must be inside the directory C:\demo. The error generates because the JVM fails to load the main class or package name. What is the reason behind the error “Could not found or load main class” in java? Among these errors, could not find or load main class in Java, is one of them that occurs usually. 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. But some of the most popular and common errors are often faced by programmers who are new in programming. The subdirectory path doesn't match the fully qualified name. In the above program, let's create a package named com.javatpoint. Among these errors, could not find or load main class in Java, is one of them that occurs Let's create a program that generates and displays an error on the console. We may error could not find or load main class while running the Java class. All rights reserved. Duration: 1 week to 2 week. How to fix "Exception in thread main" in java? Solution − In this the class name is with wrong case it, it should be decorated. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at hr@javatpoint.com. It also occurs when we specify the .class extension at the end of the class name. To generate and display the error, we have misspelled the class name while typing the java command java DemoClas. 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. It is very common to face errors and exceptions in the Java programming language. There are some other reasons that generate the same error, as follows: To avoid or resolve the error, we need to specify the absolute package name or class name. Subham Mittal has worked in Oracle for 3 years . C/C++ difference's between "int main()" and "int main(void)". It occurs when we try to run a program. JavaTpoint offers too many high quality services. Remember that if the class is inside a package, we must use the full class name, including the package name, in the java command. How to resolve "Expected BEGIN_OBJECT but was BEGIN_ARRAY" using Gson in Java? We see that the above program compiles and runs, successfully. Solution − The extension .class is not required while executing the program. Mail us on hr@javatpoint.com, to get more information about given services. The main class is a class in which the main() method is defined. Why "this" keyword cannot be used in the main method of java class? Could Not Find or Load Main Class in Java. Following are the scenarios where this error could occur −. © Copyright 2011-2018 www.javatpoint.com. 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. When the error occurs, the JVM shows the following error message on the console: The error is mostly generated when we incorrectly specify the class name at run time of the program. Java regex program to match parenthesis "(" or, ")". Let's generate the error that could not find or load main class in the above program. The CLASSPATH of the application is incorrectly specified. Then you need to execute it using the java command as −, While executing, when JVM does not find a .class file with the specified name then a run time error occurs saying “Could not found or load main class” error as −. D:\sample>java Example Error: Could not find or load main class Example Caused by: java.lang.ClassNotFoundException: Example Solution To avoid this error, you need to specify the absolute (including packages) name of the .class file (just name) which is in the current directory. Check if a String is not empty ("") and not null in Java, Difference between using - "standard table of", "Hashed table of", or simply "table of" in SAP ABAP. Once you resolve them and compile your program success fully, an executable file with the same name as your class name is generated in your current folder, with the .class extension. Solution − In this scenario we have mention the name of the wrong package While executing we need to specify the correct package name in which the .class file exists as −. Wrong case − You need to specify the name of the class with same case Example.java is different from example.java. The error indicates that the java command failed to find or load the main class. It means, on compiling the following Java program the .class file will be generated inside the C:\demo\com\javatpoint\DemoClass.class. To avoid the error, do not write .class extension at the end of the class name while using the java command. Solution − In this the class name is wrongly spelt, we need to correct it. It is very common to face errors and exceptions in the Java programming language. For more java articles ,Click here to Subscribe JavaHungry The error also occurs when we don't place the class in the correct folder. The class has been declared in the wrong package. Wrong package − You might have created the .class file in a package and tried to execute without package name or with wrong package name.

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