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package java.lang.reflect;

InvocationTargetException is a checked exception that wraps
an exception thrown by an invoked method or constructor.
As of release 1.4, this exception has been retrofitted to conform to the general purpose exception-chaining mechanism. The "target exception" that is provided at construction time and accessed via the getTargetException() method is now known as the cause, and may be accessed via the Throwable.getCause() method, as well as the aforementioned "legacy method." 
See Also:
Method
Constructor
Since:
1.1/**
 * InvocationTargetException is a checked exception that wraps
 * an exception thrown by an invoked method or constructor.
 *
 * <p>As of release 1.4, this exception has been retrofitted to conform to
 * the general purpose exception-chaining mechanism.  The "target exception"
 * that is provided at construction time and accessed via the
 * {@link #getTargetException()} method is now known as the <i>cause</i>,
 * and may be accessed via the {@link Throwable#getCause()} method,
 * as well as the aforementioned "legacy method."
 *
 * @see Method
 * @see Constructor
 * @since 1.1
 */
public class InvocationTargetException extends ReflectiveOperationException {
    
Use serialVersionUID from JDK 1.1.X for interoperability
/**
     * Use serialVersionUID from JDK 1.1.X for interoperability
     */
    private static final long serialVersionUID = 4085088731926701167L;

     
This field holds the target if the
InvocationTargetException(Throwable target) constructor was
used to instantiate the object
@serial
/**
     * This field holds the target if the
     * InvocationTargetException(Throwable target) constructor was
     * used to instantiate the object
     *
     * @serial
     *
     */
    private Throwable target;

    
Constructs an InvocationTargetException with null as the target exception. /**
     * Constructs an {@code InvocationTargetException} with
     * {@code null} as the target exception.
     */
    protected InvocationTargetException() {
        super((Throwable)null);  // Disallow initCause
    }

    
Constructs a InvocationTargetException with a target exception.
Params:
target – the target exception/**
     * Constructs a InvocationTargetException with a target exception.
     *
     * @param target the target exception
     */
    public InvocationTargetException(Throwable target) {
        super((Throwable)null);  // Disallow initCause
        this.target = target;
    }

    
Constructs a InvocationTargetException with a target exception
and a detail message.
Params:
target – the target exception
s –      the detail message/**
     * Constructs a InvocationTargetException with a target exception
     * and a detail message.
     *
     * @param target the target exception
     * @param s      the detail message
     */
    public InvocationTargetException(Throwable target, String s) {
        super(s, null);  // Disallow initCause
        this.target = target;
    }

    
Get the thrown target exception.
This method predates the general-purpose exception chaining facility. The Throwable.getCause() method is now the preferred means of obtaining this information. 
Returns:
the thrown target exception (cause of this exception)./**
     * Get the thrown target exception.
     *
     * <p>This method predates the general-purpose exception chaining facility.
     * The {@link Throwable#getCause()} method is now the preferred means of
     * obtaining this information.
     *
     * @return the thrown target exception (cause of this exception).
     */
    public Throwable getTargetException() {
        return target;
    }

    
Returns the cause of this exception (the thrown target exception, which may be null). 
Returns:
 the cause of this exception.
Since:
  1.4/**
     * Returns the cause of this exception (the thrown target exception,
     * which may be {@code null}).
     *
     * @return  the cause of this exception.
     * @since   1.4
     */
    public Throwable getCause() {
        return target;
    }
}