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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.javacutil;

import org.checkerframework.checker.formatter.qual.FormatMethod;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Exception type indicating a mistake by an end user in using the Checker Framework, such as
 * incorrect command-line arguments.
 *
 * To indicate a bug in the framework, use {@link BugInCF}. To indicate a bug in a checker
 * implementation, use {@link TypeSystemError}.
 */
@SuppressWarnings("serial")
public class UserError extends RuntimeException {

    /**
     * Constructs a new CheckerError with the specified detail message.
     *
     * @param message the detail message
     */
    public UserError(String message) {
        super(message);
        if (message == null) {
            throw new BugInCF("Must have a detail message.");
        }
    }

    /**
     * Constructs a new CheckerError with a detail message composed from the given arguments.
     *
     * @param fmt the format string
     * @param args the arguments for the format string
     */
    @FormatMethod
    public UserError(String fmt, @Nullable Object... args) {
        this(String.format(fmt, args));
    }
}