Java Architecture for XML Binding (JAXB) is a Java API that allows Java developers to map Java classes to XML representations.

jaxb-api-2.3.1.jar is the JAR file for the JAXB API 2.3 specification. You can download and use it directly without any building process as shown in the last tutorial.

If you want to rebuild the JAR file, you can download the source code at JAXB API Maven Website.

You can also browse the source code below:

⏎ javax/xml/bind/annotation/adapters/NormalizedStringAdapter.java

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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * or LICENSE.txt.  See the License for the specific
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package javax.xml.bind.annotation.adapters;



/**
 * {@link XmlAdapter} to handle {@code xs:normalizedString}.
 *
 * <p>
 * Replaces any tab, CR, and LF by a whitespace character ' ',
 * as specified in <a href="http://www.w3.org/TR/xmlschema-2/#rf-whiteSpace">the whitespace facet 'replace'</a>
 *
 * @author Kohsuke Kawaguchi, Martin Grebac
 * @since 1.6, JAXB 2.0
 */
public final class NormalizedStringAdapter extends XmlAdapter<String,String> {
    /**
     * Replace any tab, CR, and LF by a whitespace character ' ',
     * as specified in <a href="http://www.w3.org/TR/xmlschema-2/#rf-whiteSpace">the whitespace facet 'replace'</a>
     */
    public String unmarshal(String text) {
        if(text==null)      return null;    // be defensive

        int i=text.length()-1;

        // look for the first whitespace char.
        while( i>=0 && !isWhiteSpaceExceptSpace(text.charAt(i)) )
            i--;

        if( i<0 )
            // no such whitespace. replace(text)==text.
            return text;

        // we now know that we need to modify the text.
        // allocate a char array to do it.
        char[] buf = text.toCharArray();

        buf[i--] = ' ';
        for( ; i>=0; i-- )
            if( isWhiteSpaceExceptSpace(buf[i]))
                buf[i] = ' ';

        return new String(buf);
    }

    /**
     * No-op.
     *
     * Just return the same string given as the parameter.
     */
        public String marshal(String s) {
            return s;
        }


    /**
     * Returns true if the specified char is a white space character
     * but not 0x20.
     */
    protected static boolean isWhiteSpaceExceptSpace(char ch) {
        // most of the characters are non-control characters.
        // so check that first to quickly return false for most of the cases.
        if( ch>=0x20 )   return false;

        // other than we have to do four comparisons.
        return ch == 0x9 || ch == 0xA || ch == 0xD;
    }
}

⏎ javax/xml/bind/annotation/adapters/NormalizedStringAdapter.java

Or download all of them as a single archive file:

File name: jaxb-api-2.3.1-sources.jar
File size: 271123 bytes
Release date: 2018-10-10
Download 

⇒ Download JAXB 2.2 Specification and API JAR

⇐ Download JAXB 2.3 Specification and API JAR

⇑ JAXB (Java Architecture for XML Binding) API Specification

⇑⇑ FAQ for jaxb-*.jar - Java Architecture for XML Binding