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## java.lang.reflect
Class UndeclaredThrowableException

    java.lang.Object
      java.lang.Throwable
          java.lang.Exception
              java.lang.RuntimeException
                  java.lang.reflect.UndeclaredThrowableException

All Implemented Interfaces:
  Serializable

    public class UndeclaredThrowableException

extends RuntimeException

Thrown by a method invocation on a proxy instance if its invocation handler's `invoke` method throws a checked exception (a `Throwable` that is not assignable to `RuntimeException` or `Error`) that is not assignable to any of the exception types declared in the `throws` clause of the method that was invoked on the proxy instance and dispatched to the invocation handler.

An `UndeclaredThrowableException` instance contains the undeclared checked exception that was thrown by the invocation handler, and it can be retrieved with the `getUndeclaredThrowable()` method. `UndeclaredThrowableException` extends `RuntimeException`, so it is an unchecked exception that wraps a checked exception.

As of release 1.4, this exception has been retrofitted to conform to the general purpose exception-chaining mechanism. The "undeclared checked exception that was thrown by the invocation handler" that may be provided at construction time and accessed via the `getUndeclaredThrowable()` method is now known as the cause, and may be accessed via the `Throwable.getCause()` method, as well as the aforementioned "legacy method."

Since:
  JDK1.3
See Also:
  `InvocationHandler`, Serialized Form

Constructor Summary
`UndeclaredThrowableException(Throwable undeclaredThrowable)` Constructs an `UndeclaredThrowableException` with the specified `Throwable`.
`UndeclaredThrowableException(Throwable undeclaredThrowable, String s)` Constructs an `UndeclaredThrowableException` with the specified `Throwable` and a detail message.

Method Summary
`Throwable` | `getCause()` Returns the cause of this exception (the `Throwable` instance wrapped in this `UndeclaredThrowableException`, which may be `null`).
`Throwable` | `getUndeclaredThrowable()` Returns the `Throwable` instance wrapped in this `UndeclaredThrowableException`, which may be `null`.

Methods inherited from class java.lang.Throwable
`fillInStackTrace, 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

### UndeclaredThrowableException

    public UndeclaredThrowableException(Throwable undeclaredThrowable)

  Constructs an `UndeclaredThrowableException` with the specified `Throwable`.

  Parameters:
    `undeclaredThrowable` - the undeclared checked exception that was thrown

### UndeclaredThrowableException

    public UndeclaredThrowableException(Throwable undeclaredThrowable,
                                        String s)

  Constructs an `UndeclaredThrowableException` with the specified `Throwable` and a detail message.

  Parameters:
    `undeclaredThrowable` - the undeclared checked exception that was thrown
    `s` - the detail message

Method Detail

### getUndeclaredThrowable

    public Throwable getUndeclaredThrowable()

  Returns the `Throwable` instance wrapped in this `UndeclaredThrowableException`, which may be `null`.

  This method predates the general-purpose exception chaining facility. The `Throwable.getCause()` method is now the preferred means of obtaining this information.

  Returns:
    the undeclared checked exception that was thrown

### getCause

    public Throwable getCause()

  Returns the cause of this exception (the `Throwable` instance wrapped in this `UndeclaredThrowableException`, which may be `null`).

  Overrides:
    `getCause` in class `Throwable`
  Returns:
    the cause of this exception.
  Since:
    1.4

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.