有熟悉mina的快点救命呀

用mina 建了个服务端，当有信息同时发给多个客户端时，出现如下错误
java.lang.IllegalStateException: Already released buffer.  You released the buffer too many times.
at org.apache.mina.common.SimpleByteBufferAllocator$SimpleByteBuffer.release(SimpleByteBufferAllocator.java:81)
at org.apache.mina.util.ByteBufferUtil.releaseIfPossible(ByteBufferUtil.java:39)
at org.apache.mina.common.support.AbstractIoFilterChain$TailFilter.messageSent(AbstractIoFilterChain.java:581)
at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageSent(AbstractIoFilterChain.java:320)
at org.apache.mina.common.support.AbstractIoFilterChain.access$1200(AbstractIoFilterChain.java:53)
at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageSent(AbstractIoFilterChain.java:653)
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageSent(ProtocolCodecFilter.java:193)
at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageSent(AbstractIoFilterChain.java:320)
at org.apache.mina.common.support.AbstractIoFilterChain.access$1200(AbstractIoFilterChain.java:53)
at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageSent(AbstractIoFilterChain.java:653)
at org.apache.mina.filter.LoggingFilter.messageSent(LoggingFilter.java:97)
at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageSent(AbstractIoFilterChain.java:320)
at org.apache.mina.common.support.AbstractIoFilterChain.access$1200(AbstractIoFilterChain.java:53)
at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageSent(AbstractIoFilterChain.java:653)
at org.apache.mina.filter.executor.ExecutorFilter.processEvent(ExecutorFilter.java:222)
at org.apache.mina.filter.executor.ExecutorFilter$ProcessEventsRunnable.run(ExecutorFilter.java:264)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
at java.lang.Thread.run(Unknown Source)