How-to articles, tricks, and solutions about CLASSPATH

If you are seeing an error message that says "Error: Could not find or load main class", it is likely that there is a problem with the classpath for your project.

A ClassNotFoundException occurs when the Java virtual machine (JVM) is unable to find a class that has been referenced in your code. This can happen for a number of reasons, including:

To add a directory to the classpath in an application run profile in IntelliJ IDEA, follow these steps:

To read a text file from the classpath in Java, you can use the getResourceAsStream method of the ClassLoader class to get an InputStream for the file, and then use a BufferedReader to read the contents of the file.

To include all the jars in a directory within the Java classpath, you can use the -cp or -classpath command-line option and specify the directory containing the jars.