If you are running an application through a browser and get security warnings that say the application is blocked, check the following items: 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. The code is fine but it is just missing a closing curly bracket for calSum method which will result in multiple errors. In the following code snippet, consider this class called Calculator, a method called calSum perform addition of two numbers and stores the result in the variable total which is then printed on the screen. IDEs usually prove to be helpful in this case by differentiating the brackets by assigning each pair a different colour and even identify if you have forgotten to close a bracket but sometimes it still gets missed and result in an illegal start of expression java error. Developers often make this mistake because there are multiple blocks and methods nested together which results in forgetting closing an opened curly bracket. If you skip any curly braces, the compiler will not be able to identify the starting or ending point of a block which will result in an error. According to the syntax of Java programming, every block or class definition must start and end with curly braces. Skipping a curly brace in any method can result in an illegal start of expression java error. Their functionality is exactly like any other variable but they have very limited scope just within the specific block that is why they cannot be accessed from anywhere else in the code except the method in which they were declared.Īccess modifier (public, private, or protected) can be used with a simple variable but it is not allowed to be used with local variables inside the method as its accessibility is defined by its method scope. Variables that are declared inside a method are called local variables. Use of Access Modifiers with local variables Missing a semicolon at the end of The line or an omitting an opening or closing brackets are some of the most common reasons but it can be easily fixed with slight corrections and can save you a lot of time in debugging.įollowing are some most common scenarios where you would face an illegal start of expression Java error along with the method to fix them,ġ. There are numerous scenarios where you can get an illegal start of expression error. This error is thrown when the compiler detects any statement that does not abide by the rules or syntax of the Java language. The illegal start of expression java error is a dynamic error which means you would encounter it at compile time with “ javac” statement (Java compiler). What is “illegal start of expression java error”? String or Character Without Double Quotes “-” Class Inside a Method Must Not Have Modifier What is “illegal start of expression java error”?.
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