UndeclaredThrowableException

AI-generated Key Takeaways

• UndeclaredThrowableException is an unchecked exception (extends RuntimeException) that wraps a checked exception thrown by a proxy's invocation handler.

• It's thrown when the invocation handler's invoke method throws a checked exception not declared in the original method's throws clause.

• The wrapped checked exception (the cause) can be retrieved using getCause() or the legacy method getUndeclaredThrowable().

• UndeclaredThrowableException provides a way to handle checked exceptions in situations where they are not expected, like in proxy invocations.

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."

See Also

• InvocationHandler

Public 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.

Public 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.

Inherited Method Summary

From class java.lang.Throwable

synchronized final void	addSuppressed(Throwable exception) Appends the specified exception to the exceptions that were suppressed in order to deliver this exception.
synchronized Throwable	fillInStackTrace() Fills in the execution stack trace.
synchronized Throwable	getCause() Returns the cause of this throwable or null if the cause is nonexistent or unknown.
String	getLocalizedMessage() Creates a localized description of this throwable.
String	getMessage() Returns the detail message string of this throwable.
StackTraceElement[]	getStackTrace() Provides programmatic access to the stack trace information printed by printStackTrace().
synchronized final Throwable[]	getSuppressed() Returns an array containing all of the exceptions that were suppressed, typically by the try-with-resources statement, in order to deliver this exception.
synchronized Throwable	initCause(Throwable cause) Initializes the cause of this throwable to the specified value.
void	printStackTrace() Prints this throwable and its backtrace to the standard error stream.
void	printStackTrace(PrintWriter s) Prints this throwable and its backtrace to the specified print writer.
void	printStackTrace(PrintStream s) Prints this throwable and its backtrace to the specified print stream.
void	setStackTrace(StackTraceElement[] stackTrace) Sets the stack trace elements that will be returned by getStackTrace() and printed by printStackTrace() and related methods.
String	toString() Returns a short description of this throwable.

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Public Constructors

public UndeclaredThrowableException (Throwable undeclaredThrowable)

Constructs an UndeclaredThrowableException with the specified Throwable.

Parameters

undeclaredThrowable	the undeclared checked exception that was thrown

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

Public Methods

public Throwable getCause ()

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

Returns

• the cause of this exception.

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