org.apache.mina.filter.codec.ProtocolDecoderException: java.nio.BufferOverflowException解決

 先連續發幾十個很小很小的包(<10 byte) 再突然發一個大小64byte的包 這時你會發現mina就會出現以下錯誤使用mina處理大資料接收時：

org.apache.mina.filter.codec.ProtocolDecoderException: java.nio.BufferOverflowException (Hexdump: 53 53 00 04)
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:242)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:417)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:47)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:765)
at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:109)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:417)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:410)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:710)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:664)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:653)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$600(AbstractPollingIoProcessor.java:67)
at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1124)
at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.nio.BufferOverflowException
at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:182)
at org.apache.mina.core.buffer.AbstractIoBuffer.put(AbstractIoBuffer.java:625)
at org.apache.mina.core.buffer.AbstractIoBuffer.put(AbstractIoBuffer.java:1329)

經過對mina的分析，這是由對包長度不對做成的(即，我們發的包長是大於64byte的，但他的byteBuffer大小隻有64byte，當我們嘗試讀取第65個byte就會出現這個錯誤)；

解決方案：

acceptor.getSessionConfig().setReadBufferSize(1024*1024);//發送緩衝區1M

acceptor.getSessionConfig().setReceiveBufferSize(1024*1024);//接收緩衝區1M

實際應用中根據業務資料包設定合理大小就可以了。