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Fastjson is a JSON processor (JSON parser + JSON generator) written in Java
There is a newer version: 2.0.54.android8
package com.alibaba.fastjson2.util;

import com.alibaba.fastjson2.JSONReader;
import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.PropertyNamingStrategy;
import com.alibaba.fastjson2.filter.NameFilter;
import com.alibaba.fastjson2.filter.PropertyFilter;
import com.alibaba.fastjson2.filter.PropertyPreFilter;
import com.alibaba.fastjson2.filter.ValueFilter;
import com.alibaba.fastjson2.reader.*;
import com.alibaba.fastjson2.writer.*;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.security.PrivilegedAction;
import java.time.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

public class DynamicClassLoader
        extends ClassLoader {
    private static final java.security.ProtectionDomain DOMAIN;

    private static final Map> classMapping = new HashMap<>();

    private static final DynamicClassLoader instance = new DynamicClassLoader();

    private final Map classes = new ConcurrentHashMap<>();

    static {
        Class[] classes = new Class[]{
                Object.class,
                Type.class,
                Field.class,
                Method.class,

                Fnv.class,

                // reads
                JSONReader.class,
                FieldReader.class,
                ObjectReader.class,
                ObjectReader1.class,
                ObjectReader2.class,
                ObjectReader3.class,
                ObjectReader4.class,
                ObjectReader5.class,
                ObjectReader6.class,
                ObjectReader6.class,
                ObjectReader7.class,
                ObjectReader8.class,
                ObjectReader9.class,
                ObjectReader10.class,
                ObjectReader11.class,
                ObjectReader12.class,
                ObjectReaderAdapter.class,

                // writers

                JSONWriter.class,
                JSONWriter.Context.class,
                FieldWriter.class,

                PropertyPreFilter.class,
                PropertyFilter.class,
                NameFilter.class,
                ValueFilter.class,

                ObjectWriter.class,
                ObjectWriter1.class,
                ObjectWriter2.class,
                ObjectWriter3.class,
                ObjectWriter4.class,
                ObjectWriter5.class,
                ObjectWriter6.class,
                ObjectWriter7.class,
                ObjectWriter8.class,
                ObjectWriter9.class,
                ObjectWriter10.class,
                ObjectWriter11.class,
                ObjectWriter12.class,
                ObjectWriterAdapter.class,
                JDKUtils.class,
                TypeUtils.class,
                DateUtils.class,
                PropertyNamingStrategy.class,

                Collection.class,
                Set.class,
                List.class,
                ArrayList.class,
                LinkedList.class,
                Map.class,
                HashMap.class,
                LinkedHashMap.class,
                EnumSet.class,
                Optional.class,
                OptionalInt.class,
                OptionalLong.class,
                Date.class,
                Calendar.class,
                ConcurrentHashMap.class,

                java.util.function.Supplier.class,
                java.util.function.Consumer.class,
                Exception.class,
                Enum.class,
                Class.class,
                Boolean.class,
                Byte.class,
                Short.class,
                Integer.class,
                Long.class,
                Float.class,
                Double.class,
                String.class,
                BigInteger.class,
                BigDecimal.class,
                Instant.class,
                LocalTime.class,
                LocalDate.class,
                LocalDateTime.class,
                ZonedDateTime.class,
                CharArrayValueConsumer.class,
                ByteArrayValueConsumer.class
        };
        for (Class clazz : classes) {
            classMapping.put(clazz.getName(), clazz);
        }

        String[] strings = {
                "sun.misc.Unsafe",
                "java.sql.Timestamp",
                "java.sql.Date"
        };
        for (String string : strings) {
            try {
                Class c = Class.forName(string);
                classMapping.put(string, c);
            } catch (ClassNotFoundException ignored) {
                // ignored
            }
        }
    }

    static {
        DOMAIN = (java.security.ProtectionDomain) java.security.AccessController.doPrivileged(
                (PrivilegedAction