Among these errors, could not find or load main class in Java, is one of them that occurs usually. If you want to read similar articles to Could Not Find Or Load Main Class – What Does It Mean?, we recommend you visit our Software category. If you used a Java build tool, then it will run the Javac in order to detect the problem and alert you. You need to be least concerned about it, as system classes automatically find their location and you don’t have to do anything about it. You need to be careful while selecting between relative and absolute path names in the class paths. Here are a few examples: 2. 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 If you are still getting the error message, then you need to check the directory on the class path, the subdirectory that should match with the FQN, and the package declaration in the class path. There may be several reasons that may cause this error message to appear on your screen. You declared the class in wrong package. We are trying to execute this class using the command line. It occurs when we try to run a program. If that’s correct, the next thing you need to look into is the class path. Java is a relatively easy language program to learn and operate. Let us know if you liked the post. In order to resolve the error problem, you need to identify its cause first. It is employed in a huge array of computing platforms, including mobile phones, embedded devices, super computers and enterprise servers. Make sure that you have written the right program and its class name. For a deeper understanding of this concept, you need to learn some information about class path as well. Even if you specify the class name in the right way, Java command may not be able to find the needed class. If the FQN of your class is com.acme.example.Toon, then JVM will look for Toon.class inside the directory. If everything seems fine and there is no spelling mistake, then check that you have set the path correctly. Could Not Find Or Load Main Class – What Does It Mean? We get this error because we are incorrectly trying to run the main () inside the class using java command. The error occurs because it must be called with its fully qualified name. There can be several different ways of providing a wrong class name. 1. If you are a new Java developer, you must have seen the ‘could not find or load main class’ error, after which your programs refuse to run. The error indicates that the java command failed to find or load the main class. That’s the only way we can improve. Main class defined in the manifest.mf file and … But some of the most popular and common errors are often faced by programmers who are new in programming. However, if your Java code is built by hand, then the compiler may not be able to detect it and you may receive the ‘could not find or load main class’ error message on your screen. There are chances that you put the source code file in a wrong folder, or you left out the declaration of the package. If you did this in some IDE, then its compiler will alert you about it immediately. One of the most common reasons is that you did not provide the correct class name, or you provided the right class name with some mistake. There is wrong directory on the class path. If the structure of your directory does not match the name of the package in a similar pattern, then the JVM will not be able to find the desired class. In order to correctly load the main class, the JVM finds the following: Please note that JVM and JLS specifications leave some space for JVM to load the classes, and it can have some effect on when it throws the class loader exception. Restart the program, compile it again and you will be able to run it without any error. By the way, there are more to it e.g. There are many ways Error: Could not find or load main class HelloWorld manifests itself, but if you know the basics of Java Classpath, you can easily sort out the problem. In most cases, the error message will also be accompanied by the class name that it was looking for, but could not find. Class path that you use should include all the non-system classes that you are depending your application on. If you receive the error message ‘could not find or load main class’, the first thing you need to check is your class name. So, identify the issue that is causing the problem, and resolve it quickly by following the above instructions. | Sitemap, [Solved] Error: Could not find or load main class. You specified incorrect class path for the application. Most of the time you just need to either correct your CLASSPATH environment variable or run your program with java-cp or -classpath option. Initially, you can start by checking the class name and the class path settings. When you receive this error message, this simply means that the system has failed during the first step itself. Reason for error – could not find or load main class. Consider the below Java class which has a main () method. You did not enter the class name correctly. When a directory is put on the class path, it should correspond to the qualified name space’s root. Keep in mind that you can break a relative path name if there are changes in the current directory. The command of Java that you entered could not find the class required to run the program. It will result in Error : Could not find or load main class HelloWorld. 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All Rights Reserved. You did not enter the class name correctly. 6. Renaming the class by shifting its position won’t help either in this case. Follow these steps to check it: 3. One of the most common reasons is that you did not provide the correct class name, or you provided the right class name with some mistake. Once you identify the cause, you will be able to resolve it without much problem. The computer software specifications of Java are widely used for the development of application software and its deployment in cross-platform computing environments. Let’s talk about them in detail: 1. However, the ‘could not find or load main class’ error message right in the beginning of running it can be frustrating and discouraging. MainClass.java. In order to check that, find out the correct name of your package because you have placed your main class in that package. To be clear, the name of this class is not HelloWorld, It's … Class is located in the structure of the directory just below that root, and you can find it by providing a completely qualified name to your path name. This oneHOWTO article is going to give you detailed information on what does this error message mean, what are its causes, and how you can fix it. If that’s done fine too, then you can import the related language program and compile it. Let’s talk about them in detail: 1. There may be several reasons that may cause this error message to appear on your screen.
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