{* ../../docs_src/handling_errors/tutorial002_py310.py hl[14] *}

## Установка пользовательских обработчиков исключений { #install-custom-exception-handlers }

Вы можете добавить пользовательские обработчики исключений с помощью [тех же утилит обработки исключений из Starlette](https://www.starlette.dev/exceptions/).

Допустим, у вас есть пользовательское исключение `UnicornException`, которое вы (или используемая вами библиотека) можете `вызвать`.

 */
package org.codelibs.core.xml;

import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;

import org.codelibs.core.exception.IORuntimeException;
import org.codelibs.core.exception.SAXRuntimeException;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;

/**

   * split piece <i>may be longer than the specified fixed length</i>. This is because the splitter
   * will <i>stop splitting when the limit is reached</i>, and just return the final piece as-is.
   *
   * <p><b>Exception:</b> for consistency with separator-based splitters, {@code split("")} does not
   * yield an empty iterable, but an iterable containing {@code ""}. This is the only case in which

    return (short) hextet;
  }

  /**
   * Convert a byte array into an InetAddress.
   *
   * <p>{@link InetAddress#getByAddress} is documented as throwing a checked exception "if IP
   * address is of illegal length." We replace it with an unchecked exception, for use by callers
   * who already know that addr is an array of length 4 or 16.
   *
   * @param addr the raw 4-byte or 16-byte IP address in big-endian order

## Instalar manejadores de excepciones personalizados { #install-custom-exception-handlers }

Puedes agregar manejadores de excepciones personalizados con [las mismas utilidades de excepciones de Starlette](https://www.starlette.dev/exceptions/).

Supongamos que tienes una excepción personalizada `UnicornException` que tú (o un paquete que usas) podrías lanzar.

Y quieres manejar esta excepción globalmente con FastAPI.

import org.codelibs.core.convert.ShortConversionUtil;
import org.codelibs.core.exception.BeanFieldSetAccessibleFailureException;
import org.codelibs.core.exception.ConstructorNotFoundRuntimeException;
import org.codelibs.core.exception.FieldNotFoundRuntimeException;
import org.codelibs.core.exception.MethodNotFoundRuntimeException;
import org.codelibs.core.exception.PropertyNotFoundRuntimeException;
import org.codelibs.core.lang.ClassUtil;

eine Abhängigkeit mit `yield` verwendet und dann in dieser Abhängigkeit mit `except` eine Exception abgefangen haben und die Exception nicht erneut geworfen haben, die Exception automatisch an beliebige Exceptionhandler oder den Handler für interne Serverfehler weitergereicht/weitergeworfen wurde.

Dies wurde in Version 0.110.0 geändert, um unbehandelten Speicherverbrauch durch weitergeleitete Exceptions ohne Handler (interne Serverfehler) zu beheben und um es mit dem Verhalten von normalem...

package org.codelibs.core.security;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import org.codelibs.core.exception.EmptyArgumentException;
import org.codelibs.core.exception.NoSuchAlgorithmRuntimeException;
import org.junit.Test;

/**
 * @author shinsuke
 *
 */
public class MessageDigestUtilTest {
    /**
     *
     */
    @Test

import org.codelibs.core.CoreLibConstants;
import org.codelibs.core.exception.BadPaddingRuntimeException;
import org.codelibs.core.exception.IllegalBlockSizeRuntimeException;
import org.codelibs.core.exception.InvalidKeyRuntimeException;
import org.codelibs.core.exception.NoSuchAlgorithmRuntimeException;
import org.codelibs.core.exception.NoSuchPaddingRuntimeException;
import org.codelibs.core.exception.UnsupportedEncodingRuntimeException;

        DcerpcException ex2 = new DcerpcException("Access denied error");
        assertTrue(ex2 instanceof DcerpcError, "DcerpcException should implement DcerpcError");

        // Test with root cause
        Exception rootCause = new Exception("Root cause");
        DcerpcException ex3 = new DcerpcException("Error with cause", rootCause);
        assertEquals(rootCause, ex3.getCause());
    }

    @Test