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package java.lang;


An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch. Most such errors are abnormal conditions. The ThreadDeath error, though a "normal" condition, is also a subclass of Error because most applications should not try to catch it. 
 A method is not required to declare in its throws clause any subclasses of Error that might be thrown during the execution of the method but not caught, since these errors are abnormal conditions that should never occur. That is, Error and its subclasses are regarded as unchecked exceptions for the purposes of compile-time checking of exceptions. 
Author: Frank Yellin
See Also:
@jls11.2 Compile-Time Checking of Exceptions
Since:  1.0
/**
 * An {@code Error} is a subclass of {@code Throwable}
 * that indicates serious problems that a reasonable application
 * should not try to catch. Most such errors are abnormal conditions.
 * The {@code ThreadDeath} error, though a "normal" condition,
 * is also a subclass of {@code Error} because most applications
 * should not try to catch it.
 * <p>
 * A method is not required to declare in its {@code throws}
 * clause any subclasses of {@code Error} that might be thrown
 * during the execution of the method but not caught, since these
 * errors are abnormal conditions that should never occur.
 *
 * That is, {@code Error} and its subclasses are regarded as unchecked
 * exceptions for the purposes of compile-time checking of exceptions.
 *
 * @author  Frank Yellin
 * @see     java.lang.ThreadDeath
 * @jls 11.2 Compile-Time Checking of Exceptions
 * @since   1.0
 */
public class Error extends Throwable {
    static final long serialVersionUID = 4980196508277280342L;

    
Constructs a new error with null as its detail message. The cause is not initialized, and may subsequently be initialized by a call to Throwable.initCause. 
/**
     * Constructs a new error with {@code null} as its detail message.
     * The cause is not initialized, and may subsequently be initialized by a
     * call to {@link #initCause}.
     */
    public Error() {
        super();
    }

    
Constructs a new error with the specified detail message. The cause is not initialized, and may subsequently be initialized by a call to Throwable.initCause. 
Params:
  • message –  the detail message. The detail message is saved for later retrieval by the Throwable.getMessage() method.
/**
     * Constructs a new error with the specified detail message.  The
     * cause is not initialized, and may subsequently be initialized by
     * a call to {@link #initCause}.
     *
     * @param   message   the detail message. The detail message is saved for
     *          later retrieval by the {@link #getMessage()} method.
     */
    public Error(String message) {
        super(message);
    }

    
Constructs a new error with the specified detail message and
cause.  
Note that the detail message associated with cause is not automatically incorporated in
this error's detail message.

Params:
  • message – the detail message (which is saved for later retrieval by the Throwable.getMessage() method).
  • cause – the cause (which is saved for later retrieval by the Throwable.getCause() method). (A null value is permitted, and indicates that the cause is nonexistent or unknown.)
Since: 1.4
/**
     * Constructs a new error with the specified detail message and
     * cause.  <p>Note that the detail message associated with
     * {@code cause} is <i>not</i> automatically incorporated in
     * this error's detail message.
     *
     * @param  message the detail message (which is saved for later retrieval
     *         by the {@link #getMessage()} method).
     * @param  cause the cause (which is saved for later retrieval by the
     *         {@link #getCause()} method).  (A {@code null} value is
     *         permitted, and indicates that the cause is nonexistent or
     *         unknown.)
     * @since  1.4
     */
    public Error(String message, Throwable cause) {
        super(message, cause);
    }

    
Constructs a new error with the specified cause and a detail message of (cause==null ? null : cause.toString()) (which typically contains the class and detail message of cause). This constructor is useful for errors that are little more than wrappers for other throwables. 
Params:
  • cause – the cause (which is saved for later retrieval by the Throwable.getCause() method). (A null value is permitted, and indicates that the cause is nonexistent or unknown.)
Since: 1.4
/**
     * Constructs a new error with the specified cause and a detail
     * message of {@code (cause==null ? null : cause.toString())} (which
     * typically contains the class and detail message of {@code cause}).
     * This constructor is useful for errors that are little more than
     * wrappers for other throwables.
     *
     * @param  cause the cause (which is saved for later retrieval by the
     *         {@link #getCause()} method).  (A {@code null} value is
     *         permitted, and indicates that the cause is nonexistent or
     *         unknown.)
     * @since  1.4
     */
    public Error(Throwable cause) {
        super(cause);
    }

    
Constructs a new error with the specified detail message,
cause, suppression enabled or disabled, and writable stack
trace enabled or disabled.

Params:
  • message – the detail message.
  • cause – the cause. (A null value is permitted, and indicates that the cause is nonexistent or unknown.)
  • enableSuppression – whether or not suppression is enabled
                         or disabled
  • writableStackTrace – whether or not the stack trace should
                          be writable
Since:1.7
/**
     * Constructs a new error with the specified detail message,
     * cause, suppression enabled or disabled, and writable stack
     * trace enabled or disabled.
     *
     * @param  message the detail message.
     * @param cause the cause.  (A {@code null} value is permitted,
     * and indicates that the cause is nonexistent or unknown.)
     * @param enableSuppression whether or not suppression is enabled
     *                          or disabled
     * @param writableStackTrace whether or not the stack trace should
     *                           be writable
     *
     * @since 1.7
     */
    protected Error(String message, Throwable cause,
                    boolean enableSuppression,
                    boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
    }
}