Class ExceptionUtil

java.lang.Object

org.eclipse.jetty.util.ExceptionUtil

public class ExceptionUtil
extends Object

Exception (or rather Throwable utility methods.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ExceptionUtil.MultiException

Method Summary

Modifier and Type	Method	Description
static void	addSuppressedIfNotAssociated(Throwable throwable, Throwable suppressed)	Add a suppressed exception if it is not associated.
static boolean	areAssociated(Throwable t1, Throwable t2)	Check if two Throwables are associated.
static boolean	areNotAssociated(Throwable t1, Throwable t2)	Check if two Throwables are associated.
static <T extends Throwable> T	as(Class<T> type, Throwable throwable)	Convert a Throwable to a specific type by casting or construction on a new instance.
static RuntimeException	asRuntimeException(Throwable cause)	Convert or cast a Throwable to an unchecked RuntimeException.
static void	call(Throwable cause, Consumer<Throwable> consumer)	Call a method that handles a Throwable, catching and associating any exception that it throws.
static void	call(Invocable.Callable callable, Consumer<Throwable> failure)	Call a Invocable.Callable and handle any resulting failures
static void	callAndThen(Runnable call, Runnable then)	Call a Runnable and then always call another, ignoring any exceptions thrown.
static void	callAndThen(Throwable cause, Consumer<Throwable> call, Runnable then)	Call a handler of Throwable and then always call a Runnable, suppressing any exceptions thrown.
static void	callAndThen(Throwable cause, Consumer<Throwable> call, Consumer<Throwable> then)	Call a handler of Throwable and then always call another, suppressing any exceptions thrown.
static Throwable	combine(Throwable t1, Throwable t2)	Combine two, possible null, Throwables in a style to facilitate handling multiple exceptions that are accumulated as suppressed exceptions.
static <T> T	get(CompletableFuture<T> completableFuture)	Get from a CompletableFuture and convert any uncheck exceptions to RuntimeException.
static void	ifExceptionThrow(Throwable throwable)	Throw a Throwable as a checked Exception if it cannot be thrown as unchecked.
static <T extends Throwable> void	ifExceptionThrowAllAs(Class<T> type, Throwable throwable)	Throw a Throwable as a specific type, casting or construction as required.
static <T extends Throwable> void	ifExceptionThrowAs(Class<T> type, Throwable throwable)	Throw a Throwable as a specific type, casting or construction as required.
static void	ifExceptionThrowUnchecked(Throwable throwable)	Throw a Throwable as an unchecked Exception.
static void	run(Runnable runnable, Consumer<Throwable> failure)	Call a Runnable and handle failures
static String	toString(Throwable throwable)	Convert a Throwable to a string equivalent to what Throwable.printStackTrace() prints.
static <T extends Throwable> T	withSuppressed(T t, List<Throwable> errors)	Decorate a Throwable with the suppressed errors and return it.

Methods inherited from class Object

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

Method Details

as

public static <T extends Throwable> T as(Class<T> type,
 Throwable throwable)
                                  throws IllegalArgumentException

Convert a Throwable to a specific type by casting or construction on a new instance.

Type Parameters:

T - The type of the Throwable to be returned

Parameters:

type - The type of the Throwable to be thrown. It must have a constructor that takes a Throwable as a cause.

throwable - The Throwable or null

Returns:

A Throwable of type T or null.

Throws:

IllegalArgumentException - if the passed type cannot be constructed with a cause.

ifExceptionThrow

public static void ifExceptionThrow(Throwable throwable)
                             throws Error,
Exception

Throw a Throwable as a checked Exception if it cannot be thrown as unchecked.

Parameters:

throwable - The Throwable to throw or null.

Throws:

Error - If the passed Throwable is an Error.

Exception - Otherwise, if the passed Throwable is not null.

ifExceptionThrowUnchecked

public static void ifExceptionThrowUnchecked(Throwable throwable)
                                      throws Error,
RuntimeException

Throw a Throwable as an unchecked Exception.

Parameters:

throwable - The Throwable to throw or null.

Throws:

Error - If the passed Throwable is an Error.

RuntimeException - Otherwise, if the passed Throwable is not null.

asRuntimeException

public static RuntimeException asRuntimeException(Throwable cause)
                                           throws Error

Convert or cast a Throwable to an unchecked RuntimeException.

Parameters:

cause - The Throwable to that cause.

Returns:

RuntimeException Otherwise, if the passed Throwable is not null.

Throws:

Error - If the passed Throwable is an Error.

ifExceptionThrowAs

public static <T extends Throwable> void ifExceptionThrowAs(Class<T> type,
 Throwable throwable)
                                                     throws Error,
RuntimeException,
T,
IllegalArgumentException

Throw a Throwable as a specific type, casting or construction as required.

Type Parameters:

T - The type of the Throwable to be thrown if throwable is not null.

Parameters:

type - The type of the Throwable to be thrown. It must have a constructor that takes a Throwable as a cause.

throwable - A Throwable or null.

Throws:

Error - If the passed Throwable is an Error.

RuntimeException - If the passed Throwable is a RuntimeException.

T - Thrown in throwable is not null and neither an Error nor RuntimeException.

IllegalArgumentException - if the passed type cannot be constructed with a cause.

ifExceptionThrowAllAs

public static <T extends Throwable> void ifExceptionThrowAllAs(Class<T> type,
 Throwable throwable)
                                                        throws T

Throw a Throwable as a specific type, casting or construction as required.

Type Parameters:

T - The type of the Throwable to be thrown if throwable is not null.

Parameters:

type - The type of the Throwable to be thrown. It must have a constructor that takes a Throwable as a cause.

throwable - A Throwable or null.

Throws:

T - Thrown in throwable is not null and neither an Error nor RuntimeException.

areAssociated

public static boolean areAssociated(Throwable t1,
 Throwable t2)

Check if two Throwables are associated.

Parameters:

t1 - A Throwable or null

t2 - Another Throwable or null

Returns:

true iff the exceptions are not associated by being the same instance, sharing a cause or one suppressing the other.

areNotAssociated

public static boolean areNotAssociated(Throwable t1,
 Throwable t2)

Check if two Throwables are associated.

Parameters:

t1 - A Throwable or null

t2 - Another Throwable or null

Returns:

true iff the exceptions are not associated by being the same instance, sharing a cause or one suppressing the other.

addSuppressedIfNotAssociated

public static void addSuppressedIfNotAssociated(Throwable throwable,
 Throwable suppressed)

Add a suppressed exception if it is not associated.

Parameters:

throwable - The main Throwable

suppressed - The Throwable to suppress if it is not associated.

See Also:

• areNotAssociated(Throwable, Throwable)

withSuppressed

public static <T extends Throwable> T withSuppressed(T t,
 List<Throwable> errors)

Decorate a Throwable with the suppressed errors and return it.

Type Parameters:

T - of type Throwable

Parameters:

t - the throwable

errors - the list of errors

Returns:

the original throwable with suppressed errors

combine

public static Throwable combine(Throwable t1,
 Throwable t2)

Combine two, possible null, Throwables in a style to facilitate handling multiple exceptions that are accumulated as suppressed exceptions. This is freqently used in the following pattern:

    Throwable multiException = null;
    for (Runnable task : manyThings)
    {
        try
        {
            task.run();
        }
        catch(Throwable t)
        {
            multiException = multiException.combine(multiException, t)
        }
    }
    MultiException.ifExceptionalThrow(multiException);

Parameters:

t1 - A Throwable or null

t2 - Another Throwable or null

Returns:

t1 with t2 suppressed, or null.

call

public static void call(Throwable cause,
 Consumer<Throwable> consumer)

Call a method that handles a Throwable, catching and associating any exception that it throws.

Parameters:

cause - The Throwable to pass to the consumer

consumer - The handler of a Throwable

call

public static void call(Invocable.Callable callable,
 Consumer<Throwable> failure)

Call a Invocable.Callable and handle any resulting failures

Parameters:

callable - The Invocable.Callable to call

failure - A handler of failures from the call

See Also:

• run(Runnable, Consumer)

run

public static void run(Runnable runnable,
 Consumer<Throwable> failure)

Call a Runnable and handle failures

Parameters:

runnable - The runnable to call

failure - The handling of failures

See Also:

• call(Throwable, Consumer)

callAndThen

public static void callAndThen(Throwable cause,
 Consumer<Throwable> call,
 Consumer<Throwable> then)

Call a handler of Throwable and then always call another, suppressing any exceptions thrown.

Parameters:

cause - The Throwable to be passed to both consumers.

call - The first Consumer of Throwable to call.

then - The second Consumer of Throwable to call.

callAndThen

public static void callAndThen(Throwable cause,
 Consumer<Throwable> call,
 Runnable then)

Call a handler of Throwable and then always call a Runnable, suppressing any exceptions thrown.

Parameters:

cause - The Throwable to be passed to both consumers.

call - The Consumer of Throwable to call.

then - The Runnable to call.

callAndThen

public static void callAndThen(Runnable call,
 Runnable then)

Call a Runnable and then always call another, ignoring any exceptions thrown.

Parameters:

call - The first Runnable to call.

then - The second Runnable to call.

get

public static <T> T get(CompletableFuture<T> completableFuture)

Get from a CompletableFuture and convert any uncheck exceptions to RuntimeException.

Type Parameters:

T - The type of the CompletableFuture

Parameters:

completableFuture - The future to get from.

Returns:

The value from calling CompletableFuture.get()

Throws:

RuntimeException - if the call to CompletableFuture.get() throws.

toString

public static String toString(Throwable throwable)

Convert a Throwable to a string equivalent to what Throwable.printStackTrace() prints.

Parameters:

throwable - The Throwable or null

Returns:

a string containing the throwable's full stack trace