javax.servlet

Class ServletException

java.lang.Object

java.lang.Throwable

java.lang.Exception

javax.servlet.ServletException

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

UnavailableException

public class ServletException
extends Exception

Defines a general exception a servlet can throw when it encounters difficulty.

Author:

Various

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ServletException() Constructs a new servlet exception.
ServletException(String message) Constructs a new servlet exception with the specified message.
ServletException(String message, Throwable rootCause) Constructs a new servlet exception when the servlet needs to throw an exception and include a message about the "root cause" exception that interfered with its normal operation, including a description message.
ServletException(Throwable rootCause) Constructs a new servlet exception when the servlet needs to throw an exception and include a message about the "root cause" exception that interfered with its normal operation.

Method Summary

Modifier and Type	Method and Description
Throwable	getRootCause() Returns the exception that caused this servlet exception.

Methods inherited from class java.lang.Throwable

addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ServletException

public ServletException()

Constructs a new servlet exception.

ServletException

public ServletException(String message)

Constructs a new servlet exception with the specified message. The message can be written to the server log and/or displayed for the user.

Parameters:

message - a String specifying the text of the exception message

ServletException

public ServletException(String message,
                        Throwable rootCause)

Constructs a new servlet exception when the servlet needs to throw an exception and include a message about the "root cause" exception that interfered with its normal operation, including a description message.

Parameters:

message - a String containing the text of the exception message

rootCause - the Throwable exception that interfered with the servlet's normal operation, making this servlet exception necessary

ServletException

public ServletException(Throwable rootCause)

Constructs a new servlet exception when the servlet needs to throw an exception and include a message about the "root cause" exception that interfered with its normal operation. The exception's message is based on the localized message of the underlying exception.

This method calls the getLocalizedMessage method on the Throwable exception to get a localized exception message. When subclassing ServletException, this method can be overridden to create an exception message designed for a specific locale.

Parameters:

rootCause - the Throwable exception that interfered with the servlet's normal operation, making the servlet exception necessary

Method Detail

getRootCause

public Throwable getRootCause()

Returns the exception that caused this servlet exception.

Returns:

the Throwable that caused this servlet exception