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Jackson is a high-performance JSON processor (parser, generator)
There is a newer version: 0.9.5
package impl;

import java.io.*;

import org.codehaus.jackson.*;

import main.BaseTest;

/**
 * Unit test(s) to verify that handling of byte-based symbol tables
 * is working. Created to verify fix to [JACKSON-5]
 */
public class TestByteBasedSymbols
    extends BaseTest
{
    final static String[] FIELD_NAMES = new String[] {
        "a", "b", "c", "x", "y", "b13", "abcdefg", "a123",
        "a0", "b0", "c0", "d0", "e0", "f0", "g0", "h0",
        "x2", "aa", "ba", "ab", "b31", "___x", "aX", "xxx",
        "a2", "b2", "c2", "d2", "e2", "f2", "g2", "h2",
        "a3", "b3", "c3", "d3", "e3", "f3", "g3", "h3",
        "a1", "b1", "c1", "d1", "e1", "f1", "g1", "h1",
    };

    /**
     * This unit test checks that [JACKSON-5] is fixed; if not, a
     * symbol table corruption should result in odd problems.
     */
    public void testSharedSymbols()
        throws Exception
    {
        // MUST share a single json factory
        JsonFactory jf = new JsonFactory();

        /* First things first: parse a dummy doc to populate
         * shared symbol table with some stuff
         */
        String DOC0 = "{ \"a\" : 1, \"x\" : [ ] }";
        JsonParser jp0 = createParser(jf, DOC0);

        /* Important: don't close, don't traverse past end.
         * This is needed to create partial still-in-use symbol
         * table...
         */
        while (jp0.nextToken() != JsonToken.START_ARRAY) { }

        String doc1 = createDoc(FIELD_NAMES, true);
        String doc2 = createDoc(FIELD_NAMES, false);

        // Let's run it twice... shouldn't matter
        for (int x = 0; x < 2; ++x) {
            JsonParser jp1 = createParser(jf, doc1);
            JsonParser jp2 = createParser(jf, doc2);

            assertToken(JsonToken.START_OBJECT, jp1.nextToken());
            assertToken(JsonToken.START_OBJECT, jp2.nextToken());
            
            int len = FIELD_NAMES.length;
            for (int i = 0; i < len; ++i) {
                assertToken(JsonToken.FIELD_NAME, jp1.nextToken());
                assertToken(JsonToken.FIELD_NAME, jp2.nextToken());
                assertEquals(FIELD_NAMES[i], jp1.getCurrentName());
                assertEquals(FIELD_NAMES[len-(i+1)], jp2.getCurrentName());
                assertToken(JsonToken.VALUE_NUMBER_INT, jp1.nextToken());
                assertToken(JsonToken.VALUE_NUMBER_INT, jp2.nextToken());
                assertEquals(i, jp1.getIntValue());
                assertEquals(i, jp2.getIntValue());
            }
            
            assertToken(JsonToken.END_OBJECT, jp1.nextToken());
            assertToken(JsonToken.END_OBJECT, jp2.nextToken());
            
            jp1.close();
            jp2.close();
        }
    }

    /*
    ////////////////////////////////////////////
    // Helper methods
    ////////////////////////////////////////////
     */

    protected JsonParser createParser(JsonFactory jf, String input)
        throws IOException, JsonParseException
    {
        byte[] data = input.getBytes("UTF-8");
        InputStream is = new ByteArrayInputStream(data);
        return jf.createJsonParser(is);
    }

    private String createDoc(String[] fieldNames, boolean add)
    {
        StringBuilder sb = new StringBuilder();
        sb.append("{ ");

        int len = fieldNames.length;
        for (int i = 0; i < len; ++i) {
            if (i > 0) {
                sb.append(", ");
            }
            sb.append('"');
            sb.append(add ? fieldNames[i] : fieldNames[len - (i+1)]);
            sb.append("\" : ");
            sb.append(i);
        }
        sb.append(" }");
        return sb.toString();
    }
}