mina自定义解码器报错？

Question

自定义的mina解码器时不时就会报错，找了很久没找到原因？希望各位大佬给我排查一下，帮我理一下怎么定位这个问题一，
下是自己写的解码器

protected boolean doDecode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
        if (in.position() == in.limit())
            return false;
        //前4字节校验代码
        if (in.remaining() < 4) {
            //由于未消费字节，无需reset
            return false;
        }
        if (isPolicy(session, in))
            return false;

        in.mark();

        // 接受key
        if (in.limit() == 8) {
            for (int i = 0; i < 4; i++) {
                in.get();
            }
            byte[] keys = new byte[4];
            keys[0] = in.get();
            keys[1] = in.get();
            keys[2] = in.get();
            keys[3] = in.get();
            session.setAttribute("randomKey", keys);
            return false;
        }

        // 获得密匙
        byte[] keys = (byte[]) session.getAttribute("randomKey");
        if (keys == null) {
            in.reset();
            return false;
        }

        int dataLength = readLength1(in, keys);
        if (dataLength == -1) {
            in.reset();
            return false;
        }
        // 数据长度
        int len = in.remaining();

        // 判断长度
        if (dataLength > MNTcpConnect.MAX_DATA_LENGTH) {

            // 测试代码
            String data = "";
            {
                byte[] cc = new byte[len];
                in.get(cc);
                ByteBuffer byteBuffer = new ByteBuffer(cc);
                data = (byteBuffer.readUnsignedShort() + "   " + byteBuffer.readShort() + "    " + byteBuffer.readInt());
            }

            in.clear();
            throw new IllegalArgumentException("over max data length! length: " + dataLength + ", data:" + data);
        }
        if (dataLength > len) {
            in.reset();
            return false;
        }
        byte[] bb = new byte[dataLength];
        in.get(bb);
        // 解密数据
        ByteKit.xorBytes4(bb, keys);
        out.write(bb);
        return true;

//报错信息如下--希望大佬们帮我排查一下

2019-08-21 04:51:57,928 [pool-3-thread-21256] ERRORcore.mina.MNTcpIOHandler - Error...:core.mina.MNTcpIOHandler@67a64777
org.apache.mina.filter.codec.ProtocolDecoderException: java.lang.IllegalArgumentException: over max data length! length: 1968796530, data:57386   0    1124073472 
(Hexdump: 03 00 00 2F 2A E0 00 00 00 00 00 43 6F 6F 6B 69 65 3A 20 6D 73 74 73 68 61 73 68 3D 41 64 6D 69 6E 69 73 74 72 0D 0A 01 00 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ......)
    at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:262)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:650)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:49)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:1141)
    at core.back.MNBlacklistFilter.messageReceived(MNBlacklistFilter.java:34)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:650)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:49)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:1141)
    at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:122)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:650)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:643)
    at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:539)
    at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$1200(AbstractPollingIoProcessor.java:68)
    at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.process(AbstractPollingIoProcessor.java:1242)
    at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.process(AbstractPollingIoProcessor.java:1231)
    at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:683)
    at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: over max data length! length: 1968796530, data:57386   0    1124073472
    at core.mina.MNProtocolDecoder.doDecode(MNProtocolDecoder.java:74)
    at org.apache.mina.filter.codec.CumulativeProtocolDecoder.decode(CumulativeProtocolDecoder.java:180)
    at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:253)
    ... 19 more

Answer 1

报错是数据过大。
设置一下。
factory.setDecoderMaxObjectSize(Integer.MAX_VALUE);
factory.setEncoderMaxObjectSize(Integer.MAX_VALUE);