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jsoniter (json-iterator) is fast and flexible JSON parser available in Java and Go
There is a newer version: 0.9.23
package com.jsoniter;

import com.jsoniter.spi.*;

import java.io.IOException;
import java.util.Collection;
import java.util.List;

// only uesd by generated code to access decoder
public class CodegenAccess {

    public static void addMissingField(List missingFields, long tracker, long mask, String fieldName) {
        if ((tracker & mask) == 0) {
            missingFields.add(fieldName);
        }
    }

    public static  T reuseCollection(T col) {
        col.clear();
        return col;
    }

    public static Object existingObject(JsonIterator iter) {
        return iter.existingObject;
    }

    public static Object resetExistingObject(JsonIterator iter) {
        Object obj = iter.existingObject;
        iter.existingObject = null;
        return obj;
    }

    public static void setExistingObject(JsonIterator iter, Object obj) {
        iter.existingObject = obj;
    }

    public final static boolean nextTokenIsComma(final JsonIterator iter) throws IOException {
        byte c = readByte(iter);
        if (c == ',') {
            return true;
        }
        return nextTokenIsCommaSlowPath(iter, c);
    }

    private static boolean nextTokenIsCommaSlowPath(JsonIterator iter, byte c) throws IOException {
        switch (c) {
            case ' ':
            case '\n':
            case '\r':
            case '\t':
                break;
            default:
                return false;
        }
        return nextToken(iter) == ',';
    }

    public static byte nextToken(JsonIterator iter) throws IOException {
        return IterImpl.nextToken(iter);
    }

    public static final boolean readBoolean(String cacheKey, JsonIterator iter) throws IOException {
        return ((Decoder.BooleanDecoder) JsoniterSpi.getDecoder(cacheKey)).decodeBoolean(iter);
    }

    public static final short readShort(String cacheKey, JsonIterator iter) throws IOException {
        return ((Decoder.ShortDecoder) JsoniterSpi.getDecoder(cacheKey)).decodeShort(iter);
    }

    public static final int readInt(String cacheKey, JsonIterator iter) throws IOException {
        return ((Decoder.IntDecoder) JsoniterSpi.getDecoder(cacheKey)).decodeInt(iter);
    }

    public static final long readLong(String cacheKey, JsonIterator iter) throws IOException {
        return ((Decoder.LongDecoder) JsoniterSpi.getDecoder(cacheKey)).decodeLong(iter);
    }

    public static final float readFloat(String cacheKey, JsonIterator iter) throws IOException {
        return ((Decoder.FloatDecoder) JsoniterSpi.getDecoder(cacheKey)).decodeFloat(iter);
    }

    public static final double readDouble(String cacheKey, JsonIterator iter) throws IOException {
        return ((Decoder.DoubleDecoder) JsoniterSpi.getDecoder(cacheKey)).decodeDouble(iter);
    }

    public static final  T read(String cacheKey, JsonIterator iter) throws IOException {
        return (T) Codegen.getDecoder(cacheKey, null).decode(iter);
    }

    public static boolean readArrayStart(JsonIterator iter) throws IOException {
        byte c = IterImpl.nextToken(iter);
        if (c == '[') {
            c = IterImpl.nextToken(iter);
            if (c == ']') {
                return false;
            }
            iter.unreadByte();
            return true;
        }
        throw iter.reportError("readArrayStart", "expect [ or n");
    }

    public static boolean readObjectStart(JsonIterator iter) throws IOException {
        byte c = IterImpl.nextToken(iter);
        if (c == '{') {
            c = IterImpl.nextToken(iter);
            if (c == '}') {
                return false;
            }
            iter.unreadByte();
            return true;
        }
        throw iter.reportError("readObjectStart", "expect { or n, found: " + (char) c);
    }

    public static void reportIncompleteObject(JsonIterator iter) {
        throw iter.reportError("genObject", "expect }");
    }

    public static void reportIncompleteArray(JsonIterator iter) {
        throw iter.reportError("genArray", "expect ]");
    }

    public static final String readObjectFieldAsString(JsonIterator iter) throws IOException {
        String field = iter.readString();
        if (IterImpl.nextToken(iter) != ':') {
            throw iter.reportError("readObjectFieldAsString", "expect :");
        }
        return field;
    }

    public static final int readObjectFieldAsHash(JsonIterator iter) throws IOException {
        return IterImpl.readObjectFieldAsHash(iter);
    }

    public static final Slice readObjectFieldAsSlice(JsonIterator iter) throws IOException {
        return IterImpl.readObjectFieldAsSlice(iter);
    }

    public static final Slice readSlice(JsonIterator iter) throws IOException {
        return IterImpl.readSlice(iter);
    }

    public static final Object readMapKey(String cacheKey, JsonIterator iter) throws IOException {
        Slice encodedMapKey = readObjectFieldAsSlice(iter);
        MapKeyDecoder mapKeyDecoder = JsoniterSpi.getMapKeyDecoder(cacheKey);
        return mapKeyDecoder.decode(encodedMapKey);
    }

    final static boolean skipWhitespacesWithoutLoadMore(JsonIterator iter) throws IOException {
        for (int i = iter.head; i < iter.tail; i++) {
            byte c = iter.buf[i];
            switch (c) {
                case ' ':
                case '\n':
                case '\t':
                case '\r':
                    continue;
            }
            iter.head = i;
            return false;
        }
        return true;
    }

    public static void staticGenDecoders(TypeLiteral[] typeLiterals, StaticCodegenTarget staticCodegenTarget) {
        Codegen.staticGenDecoders(typeLiterals, staticCodegenTarget);
    }

    public static int head(JsonIterator iter) {
        return iter.head;
    }

    public static void unreadByte(JsonIterator iter) throws IOException {
        iter.unreadByte();
    }

    public static byte readByte(JsonIterator iter) throws IOException {
        return IterImpl.readByte(iter);
    }

    public static int calcHash(String str) {
        return CodegenImplObjectHash.calcHash(str);
    }

    public static void skipFixedBytes(JsonIterator iter, int n) throws IOException {
        IterImpl.skipFixedBytes(iter, n);
    }

    public static class StaticCodegenTarget {
        public String outputDir;

        public StaticCodegenTarget(String outputDir) {
            this.outputDir = outputDir;
        }
    }
}