# Class ExceptionUtils

java.lang.Object
org.apache.tomcat.util.ExceptionUtils

public class ExceptionUtils extends Object
Utilities for handling Throwables and Exceptions.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `ExceptionUtils()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static void`
  `handleThrowable(Throwable t)`
  Checks whether the supplied Throwable is one that needs to be rethrown and swallows all others.
  `static void`
  `preload()`
  NO-OP method provided to enable simple preloading of this class.
  `static Throwable`
  `unwrapInvocationTargetException(Throwable t)`
  Checks whether the supplied Throwable is an instance of `InvocationTargetException` and returns the throwable that is wrapped by it, if there is any.

  ### Methods inherited from class Object

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

- ## Constructor Details

  - ### ExceptionUtils

    public ExceptionUtils()

- ## Method Details

  - ### handleThrowable

    public static void handleThrowable(Throwable t)
    Checks whether the supplied Throwable is one that needs to be rethrown and swallows all others.
    Parameters:
      `t` - the Throwable to check

  - ### unwrapInvocationTargetException

    public static Throwable unwrapInvocationTargetException(Throwable t)
    Checks whether the supplied Throwable is an instance of `InvocationTargetException` and returns the throwable that is wrapped by it, if there is any.
    Parameters:
      `t` - the Throwable to check
    Returns:
      `t` or `t.getCause()`

  - ### preload

    public static void preload()
    NO-OP method provided to enable simple preloading of this class. Since the class is used extensively in error handling, it is prudent to preload it to avoid any failure to load this class masking the true problem during error handling.