![]() ![]() ![]() If the program works now, you'll have to change your CLASSPATH variable in the same manner as the PATH variable above.Įxception in thread "main" : HelloWorldApp/classĪpplet or Java Web Start Application Is Blocked To change your directory, type the following command at the prompt and press Return: So, for example, if your bytecode file is in /home/jdoe/java, you should change your current directory to that. One of the places java tries to find your bytecode file is your current directory. If you receive this error, java cannot find your bytecode file, HelloWorldApp.class. The Java VM requires that the class you execute with it have a main method at which to begin execution of your application.Ī Closer Look at the "Hello World!" Application discusses the main method in detail.Įxception in thread "main" : HelloWorldApp Remember, the argument is the name of the class that you want to use, not the filename.Įxception in thread "main" : main For example, you'll get this error if you try to run your program with java HelloWorldApp.class instead of java HelloWorldApp. class file that was created by the compiler. The CLASSPATH variable is set in the same manner.Ĭould not find or load main class HelloWorldApp.classĪ common mistake made by beginner programmers is to try and run the java launcher on the. Updating the PATH variable section in the JDK 8 installation instructions. If the program works now, you'll have to change your CLASSPATH variable. ![]()
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