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An easy to use Application Programming Interface (API) for working with MARC and MARCXML in Java.
There is a newer version: 2.6.12

package org.marc4j.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * This class is a shim interface to handle the normalization of unicode
 * characters. This functionality is available in java 1.6+ and newer, via the
 * java.text.Normalizer class. If for some reason that class is not available,
 * this code will attempt to fall back to using either the class
 * com.ibm.icu.text.Normalizer from the icu4j library or to using the class
 * com.solrmarc.icu.text.Normalizer which is based on (an older version) of the
 * preceding and which is included as a part of SolrMarc. Since Java 1.6 is now
 * officially "end-of-life'd" it should be a reasonable assumption that users
 * are not using a version of java that is even older than that, and this shim
 * interface class can be deprecated.
 * 
 * @author rh9ec
 */

public class Normalizer {

    private Normalizer() {
    }

    private static Class normalizerInAvailableJar = null;

    private static Class normalizerFormClass = null;

    private static boolean hasJavaTextNormalizer = false;

    // private static Class normalizerModeInAvailableJar = null;
    // private static Object normalizerModeNone = null;
    // private static Object normalizerModeNFD = null;
    // private static Object normalizerModeNFC = null;
    // private static Object normalizerModeNFKD = null;
    // private static Object normalizerModeNFKC = null;
    private static Method composeMethod = null;

    private static Method decomposeMethod = null;

    private static Method normalizeMethod = null;

    public static int NONE = 1;

    public static int NFD = 2;

    public static int NFKD = 3;

    public static int NFC = 4;

    public static int NFKC = 5;

    public static Object NFD_obj = null;

    public static Object NFKD_obj = null;

    public static Object NFC_obj = null;

    public static Object NFKC_obj = null;

    /**
     * Normalizes the supplied string using the supplied mode.
     * 
     * @param str
     * @param mode
     * @return
     */
    public static String normalize(String str, int mode) {
        String result = str;
        if (normalizerInAvailableJar == null) {
            initializeNormalizer();
        }
        try {
            if (hasJavaTextNormalizer) {
                if (mode == NFD) {
                    result =
                            normalizeMethod.invoke(null, str, NFD_obj)
                                    .toString();
                } else if (mode == NFC) {
                    result =
                            normalizeMethod.invoke(null, str, NFC_obj)
                                    .toString();
                } else if (mode == NFKD) {
                    result =
                            normalizeMethod.invoke(null, str, NFKD_obj)
                                    .toString();
                } else if (mode == NFKC) {
                    result =
                            normalizeMethod.invoke(null, str, NFKC_obj)
                                    .toString();
                } else {
                    result = str;
                }
            } else {
                if (mode == NFD) {
                    result =
                            decomposeMethod.invoke(null, str, false).toString();
                } else if (mode == NFC) {
                    result = composeMethod.invoke(null, str, false).toString();
                } else if (mode == NFKD) {
                    result = decomposeMethod.invoke(null, str, true).toString();
                } else if (mode == NFKC) {
                    result = composeMethod.invoke(null, str, true).toString();
                } else {
                    result = str;
                }
            }

        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return (result);
    }

    private static void initializeNormalizer() {
        try {
            normalizerInAvailableJar = Class.forName("java.text.Normalizer");
            hasJavaTextNormalizer = true;
            normalizerFormClass = Class.forName("java.text.Normalizer$Form");
            // Method[] normalizeMethods =
            // normalizerInAvailableJar.getMethods();
            normalizeMethod =
                    normalizerInAvailableJar.getMethod("normalize",
                            java.lang.CharSequence.class, normalizerFormClass);
            Method valueOf =
                    normalizerFormClass.getMethod("valueOf", String.class);
            NFD_obj = valueOf.invoke(null, "NFD");
            NFKD_obj = valueOf.invoke(null, "NFKD");
            NFC_obj = valueOf.invoke(null, "NFC");
            NFKC_obj = valueOf.invoke(null, "NFKC");

        } catch (ClassNotFoundException cnfe) {
            try {
                normalizerInAvailableJar =
                        Class.forName("com.ibm.icu.text.Normalizer");

            } catch (ClassNotFoundException e) {
                try {
                    normalizerInAvailableJar =
                            Class.forName("com.solrmarc.icu.text.Normalizer");
                } catch (ClassNotFoundException e1) {
                    throw new RuntimeException(e);
                }
            }
            try {
                composeMethod =
                        normalizerInAvailableJar.getMethod("compose",
                                String.class, boolean.class);
                decomposeMethod =
                        normalizerInAvailableJar.getMethod("decompose",
                                String.class, boolean.class);
            } catch (SecurityException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}