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## javax.servlet
Class ServletException

    java.lang.Object
      java.lang.Throwable
          java.lang.Exception
              javax.servlet.ServletException

All Implemented Interfaces:
  java.io.Serializable

Direct Known Subclasses:
  UnavailableException

public class ServletException
extends java.lang.Exception

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

Version:
  $Version$
Author:
  Various
See Also:
  Serialized Form

Constructor Summary
`ServletException()` Constructs a new servlet exception.
`ServletException(java.lang.String message)` Constructs a new servlet exception with the specified message.
`ServletException(java.lang.String message, java.lang.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(java.lang.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
`java.lang.Throwable` | `getRootCause()` Returns the exception that caused this servlet exception.

Methods inherited from class java.lang.Throwable
`fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, 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(java.lang.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(java.lang.String message,
                            java.lang.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(java.lang.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 java.lang.Throwable getRootCause()

  Returns the exception that caused this servlet exception.

  Returns:
    the `Throwable` that caused this servlet exception

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